Beijing Dongke United Technologies Co.,Ltd.

Dosage And Water Consumption Of Polycarboxylic Acid Water Reducing Agent

DONGKE UNITED — Wed, 27 Dec 2023 05:57:34 +0000

Dosage And Water Consumption Of Polycarboxylic Acid Water Reducing Agent

Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate. When the dosage is 0.15-0.3%, the water reduction rate can reach 18-40%. However, when the water-cement ratio is small (lower than 0.4), the dosage is more sensitive than when the water-cement ratio is high. The water reduction rate of polycarboxylic acid water reducing agent varies with the dosage of cementitious material. Under the same conditions, the water reduction rate of cementitious material dosage less than 3 is less than 400kg/m3, and this difference is easily ignored. However, in the process of use, it will be found that this traditional empirical method is not suitable for polycarboxylic acid water reducing agent, mainly because polycarboxylic acid water reducing agent is more sensitive to water consumption than traditional water reducing agent.When the water consumption is reduced, the concrete will not be able to achieve the expected compatibility; when the water consumption is high, although the slump becomes larger, there will be a lot of water seepage, or even a little segregation, which will have a negative impact on the overall performance of the concrete. This will bring a lot of inconvenience to the actual site construction. Temperature has a great influence on the dosage of polycarboxylic acid water reducing agent. In practice, it is found that the dosage of admixture is low during the daytime in normal production, and at night (the temperature is lower than 15℃), the slump is often “back to large”, and even water seepage and segregation.

Concrete is very picky about the saturation point and water consumption of water reducing agents. Once the amount is exceeded, the concrete will have the undesirable phenomena such as segregation, water seepage, running slurry, hardening and excessive air content.

(1) The replaced raw materials should be re-tested for trial mixing test and adjust the dosage to achieve the best effect;

(2) The dosage of polycarboxylic acid high-efficiency water reducing agent and the water consumption of concrete must be strictly controlled during the use;

(3) In the specific test of raw material water reducing agent, try to adjust the water reducing agent to “slow” type, in order to achieve the purpose of insensitive to raw materials and water consumption.

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Concrete Admixtures For Concrete Performance And Effect Improvement

DONGKE UNITED — Tue, 26 Dec 2023 06:17:52 +0000

Concrete Admixture For Concrete Performance And Effect Improvement

The traditional way of using concrete cannot save the amount used and is not conducive to the control of construction costs. Through the use of concrete admixtures, it is possible to achieve an improvement in all aspects of concrete performance, and it is possible to reduce the amount of concrete used to a certain extent. This promotes the development of energy-saving performance of concrete. For example, in the construction of a project, if some specific energy c3s, c3a, etc. are used to improve the performance of concrete, and slag is used as part of the raw material, the amount of concrete can be reduced while ensuring the strength of concrete. The stability of concrete. At the same time, the weight of concrete itself is reduced.

Concrete admixtures have certain adverse effects while improving the performance of concrete. For example, when the admixtures are added in unscientific amounts, the performance of concrete will be greatly reduced. When the dosage of ordinary retarder is too much, on the one hand, it will lead to the concrete not caking for a long time, and on the other hand, it will affect the moulding effect of concrete. On the other hand, it is also not conducive to the improvement of concrete strength, which brings some hidden problems of project quality. In addition, when used in various types of admixtures, due to improper control of the amount used, or without considering the mutual reflection between the admixtures, it may lead to chemical reactions between the admixtures. This is not favourable to the improvement of concrete properties.

Concrete is the main material used in construction. Ensure its performance meets the building requirements. The use of external admixtures must be strictly controlled. The structural stability of the building is improved by optimising the properties of concrete. This makes concrete admixtures play an important role in the construction industry. China should strengthen the development of the performance of external admixtures, take the long and make up for the short, so that the admixtures as an important construction supporting technology in the implementation of the project to play due value.

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Science Behind PCE Polycarboxylate Superplasticizer: How It Improves Concrete Properties

DONGKE UNITED — Fri, 22 Dec 2023 08:55:41 +0000

Science Behind Polycarboxylate Superplasticizer: How It Improves Concrete Properties

Are you curious about the secret ingredient that turns ordinary concrete into a super-strong, high-performance material? That is polycarboxylate superplasticizer! This cutting-edge chemical is revolutionizing the construction industry by enhancing the properties of concrete like never before. In this blog post, we’ll take a closer look at the science behind polycarboxylate superplasticizers and explore how it can take your concrete projects to the next level. Buckle up and get ready for an exciting journey into the world of Dongke PCE and its amazing properties!

What is Polycarboxylate Superplasticizer?

Polycarboxylate superplasticizer, also known as PCE, is an advanced chemical additive used in the construction industry to improve the performance and workability of concrete. Unlike traditional plasticizers based on naphthalene or melamine, PCE offers significant advantages due to its unique molecular structure.

So, what exactly makes PCE so special? This is down to its ability to disperse cement particles more efficiently. This results in better flowability and higher workability of the concrete mix. With PCE, you can achieve higher slump without compromising strength or durability.

But how does it work? The secret lies in the long-chain polymer molecules in PCE. These molecules have a strong affinity for both water and cement particles. When mixed with water and added to a concrete mixture, they act like tiny “hairs” that wrap around individual cement particles, preventing them from clumping together.

This dispersing effect results in a higher degree of hydration of the cement particles and ensures a more even distribution throughout the mixture. As a result, concrete becomes denser and stronger over time, making it less susceptible to cracking or shrinkage.

In addition, polycarboxylate superplasticizers have excellent retention properties, meaning they remain active for a longer period of time than other plasticizers. This extended work time provides contractors with greater flexibility on construction projects while maintaining optimal consistency.

Polycarboxylate superplasticizers are a game changer when it comes to enhancing concrete properties. Its innovative molecular structure effectively disperses cement particles, thereby improving workability. With this powerful additive, you can create high-performance concrete that exceeds traditional expectations – making Dongke PCE an indispensable ally for every construction professional!

How Polycarboxylate Superplasticizer Improves Concrete Properties

Polycarboxylate superplasticizer is an extraordinary chemical additive that has revolutionized the construction industry. When added to concrete, it enhances the workability and flow of concrete, making it easier to pour and form into a variety of shapes. But how exactly does this magical substance improve the performance of concrete?

Polycarboxylate superplasticizers can reduce the surface tension between cement particles and thus act as a dispersant. This allows the cement particles to be better dispersed in the water, improving hydration and ultimately increasing the strength and durability of the concrete.

In addition, this superplasticizer reduces water requirements without affecting workability. By incorporating polycarboxylate superplasticizers into the mix design, engineers can significantly reduce the amount of water required for proper mixing while still achieving excellent flow properties. Not only does this make the concrete stronger, it also helps reduce shrinkage and cracking problems.

In addition, polycarboxylate superplasticizers can also improve the cohesion between cement particles by generating electrostatic repulsion. This means that even with reduced water content, the particles in the mix interact better with each other, improving internal bond strength.

In addition, this chemical admixture improves the overall performance of concrete in different conditions such as high temperatures or extreme weather conditions. It also ensures that the concrete remains stable and resists potential long-term degradation.

Polycarboxylate superplasticizers play a vital role in improving several key properties of concrete, including workability, strength, durability, cohesion, and resistance to challenging conditions such as temperature changes or harsh environments. performance. The innovative science of polycarboxylate superplasticizers makes them an essential component of modern construction projects that strive for excellence in quality and longevity.

The Science Behind Polycarboxylate Superplasticizer

Polycarboxylate superplasticizer is a chemical additive that has revolutionized the concrete industry. But how does it work? Let’s take a closer look at the science behind this amazing compound.

The core component of polycarboxylate superplasticizers is long polymer chains with carboxylic acid groups. These chains have a unique structure that allows them to disperse and separate cement particles in water. This dispersion process creates more space between the particles, reducing their contact points, thereby increasing the flowability of the concrete mix.

The key lies in the functionality of these carboxylic acid groups. They have both hydrophilic (water-loving) and hydrophobic (water-repelling) properties. When added to water, these groups form a protective layer around each cement particle, preventing them from clumping together.

But how do these polymers achieve such remarkable properties? It all comes down to electrostatic repulsion. The negative charges on the polymer chains repel each other, causing them to be evenly distributed in the mixture. This further disperses the cement particles, improving flowability without affecting strength or stability.

In addition, polycarboxylate superplasticizers can also delay the initial setting time by adsorbing on hydrated cement particles. By retarding the hydration reaction, polycarboxylate superplasticizers can extend application time without compromising final strength gains.

Polycarboxylate superplasticizers improve concrete properties by dispersing cement particles and increasing fluidity while maintaining structural integrity. The science behind this innovative compound involves complex interactions between polymer chains and water molecules, improving the durability and performance of building materials.

Conclusion

Polycarboxylate superplasticizer is a highly efficient chemical additive that plays a vital role in enhancing the properties of concrete. Its unique molecular structure and dispersion mechanism enable concrete structures to have better workability, higher strength, lower moisture content and higher durability.

With advanced science and technology, Dongke PCE has developed high-quality polycarboxylate superplasticizers, which are widely used in construction projects around the world. Not only do these superplasticizers meet industry standards, their performance exceeds expectations.

Whether building skyscrapers or bridges, using Dongke PCE’s polycarboxylate superplasticizers ensures superior quality and long-lasting results. This innovative chemical additive will continue to revolutionize concrete technology by optimizing rheology, reducing cement usage and improving flowability without compromising strength or stability.

So, if you are working on a construction project that requires high-performance concrete to improve properties such as workability and strength while reducing environmental impact by reducing cement content, Dongke PCE’s polycarboxylate superplasticizers will be the Your perfect choice!

Choose Dongke PCE for your construction needs and experience first-hand the superior technology behind polycarboxylate superplasticizers. Trust their expertise in delivering innovative solutions to advance the construction industry.

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Benefits of Polycarboxylate Superplasticizer: Enhancing Concrete Performance and Workability

DONGKE UNITED — Fri, 22 Dec 2023 08:26:31 +0000

Benefits of Polycarboxylate Superplasticizer: Enhancing Concrete Performance and Workability

Are you looking to take your concrete projects to the next level? If so, then there’s a game-changing ingredient you need to know about: polycarboxylate superplasticizers. This powerful additive is revolutionizing the construction industry by improving the performance and workability of concrete. Whether you’re a DIYer or a professional contractor, understanding the benefits and applications of polycarboxylate superplasticizers can give you outstanding results like no other. So, let’s take a closer look at this remarkable innovation that is shaping the future of concrete technology!

What is Polycarboxylate Superplasticizer ?

Polycarboxylate superplasticizer, also known as PCE, is a high-performance chemical additive used in the construction industry to improve the workability and performance of concrete. It is a type of superplasticizer known for its excellent water-reducing ability.

Unlike traditional plasticizers, polycarboxylate superplasticizers have excellent dispersion properties, allowing concrete mixtures to have better fluidity and fluidity. This means it is easier to pour and consolidate on site. Additionally, it enhances the overall strength and durability of concrete structures.

A key feature of polycarboxylate superplasticizers is their ability to reduce water content without affecting concrete workability or setting time. By reducing water demand, it helps achieve higher compressive strength while maintaining optimal slump values.

This extraordinary additive creates highly effective lubrication between cement particles by adsorbing on them. This reduces friction during mixing, allowing the mixture to be better dispersed and hydrated.

In addition, polycarboxylate superplasticizers provide excellent slump retention over time. This means that the fresh concrete remains workable even after lengthy transport or on-site delays, ensuring consistent quality throughout the project.

Polycarboxylate superplasticizer is an advanced solution that significantly improves the performance and workability of concrete. The unique properties of polycarboxylate superplasticizers make them an important tool in achieving stronger, more durable structures while also providing greater flexibility during construction.

The Different Types of Polycarboxylate Superplasticizers

There are several types of polycarboxylate superplasticizers, each designed to meet specific concrete performance needs. These changes are achieved by changing the chemical structure of the polymer backbone or changing the side chains attached to the backbone.

One of these is called a comb polycarboxylate superplasticizer. It consists of a linear polyethylene glycol backbone and comb-like side chains composed of carboxylic acid groups and other functional groups. This type of polycarboxylate plasticizer has excellent dispersion capabilities and provides high water reduction rates while maintaining workability.

The other is a grafted polycarboxylate superplasticizer. Its main chain is composed of polyether or polyester, and the graft copolymer side chain is composed of carboxylic acid groups and other functional groups. Grafted superplasticizer has good compatibility with cement particles and can improve dispersion and fluidity.

Polycarboxylates based on block copolymers are another variant. They are made up of alternating blocks of hydrophilic (water-loving) and hydrophobic (water-repelling) segments, linked together in a chain-like structure. This unique arrangement effectively reduces moisture while maintaining slump.

Each type of polycarbonate has its own advantages and can be adapted to different concrete applications depending on the desired result – whether that is to achieve high strength, improved durability, enhanced workability, or all three!

By understanding these different types of polycarboxylate superplasticizers, engineers can select the most appropriate polycarboxylate superplasticizer based on project requirements, ensuring optimal concrete performance every time!

Benefits of Polycarboxylate Superplasticizer

Polycarboxylate superplasticizers offer a variety of advantages and are therefore popular for improving concrete properties and workability.

One of the main advantages of polycarboxylate superplasticizers is their ability to significantly improve the flow properties of concrete, making it easier to pour and reducing the need for excess moisture. This not only improves workability but also increases the strength and durability of the final product.

In addition, polycarboxylate superplasticizers have excellent dispersing capabilities, helping to distribute cement particles evenly in the mixture. In this way, the concrete mixture will be more uniform, with increased cohesion and less segregation.

Another advantage is the long-lasting effect of polycarboxylate superplasticizers on concrete. Unlike traditional plasticizers, they do not evaporate quickly and do not lose their effectiveness over time. This means that the concrete retains its improved properties even after long periods of use.

In addition, the use of polycarboxylate superplasticizers can provide significant cost savings for construction projects. By reducing the moisture content while maintaining workability, the amount of cement required per unit volume of concrete is reduced. This not only reduces material costs but also reduces energy consumption during production.

Polycarboxylate superplasticizers offer many benefits, such as improved workability, increased strength and durability, better dispersion of cement particles, long-lasting effects on concrete properties, and potential cost savings in construction projects. Its versatility makes it an important part of modern concrete technology.

What are the Applications of Polycarboxylate Superplasticizer?

Applications of Polycarboxylate Superplasticizer:

1.Enhance concrete strength and durability:

Polycarboxylate superplasticizers are widely used in the construction industry to improve the strength and durability of concrete structures. By reducing water content, these additives increase the density and cohesion of concrete, thereby improving compressive strength, flexural strength and overall durability.

2.Improve construction performance:

One of the main benefits of using polycarboxylate superplasticizers is the ability to significantly improve the workability of concrete mixes. This means contractors can achieve better flow properties without compromising other important factors such as setting time or final strength.

3.Reduce water content:

By effectively dispersing cement particles, polycarboxylate superplasticizers can reduce water-cement ratios while maintaining ideal workability. Not only does this improve the performance of the concrete, it also reduces the potential for shrinkage and improves resistance to chemical attack.

4.Self-compacting concrete (SCC):

Polycarboxylate superplasticizers play a vital role in the production of self-compacting concrete, ensuring proper dispersion and flow of the concrete without segregation or bleeding issues. Self-compacting concrete offers many advantages, such as increased construction speed, improved surface finish, and reduced labor requirements.

5.High performance concrete (HPC):

In applications where higher strength or superior properties are required, polycarboxylate superplasticizers can produce high-performance concrete with mechanical properties superior to conventional mixes. This makes it ideal for critical infrastructure projects such as bridges or high-rise buildings.

Polycarboxylate superplasticizers have revolutionized the way we approach modern construction practices by improving the structural integrity and workability of concrete mixtures in a variety of applications.

How to Use Polycarboxylate Superplasticizer?

Using polycarboxylate superplasticizers in concrete is a simple process but requires attention to detail. Here’s a step-by-step guide on how to use this powerful additive effectively.

Determine the amount of polycarboxylate superplasticizer required for a specific concrete mix. This depends on factors such as required workability, slump retention requirements and environmental conditions. If necessary, refer to the manufacturer’s guidelines or consult an expert.

Next, add the desired amount of water to the mixing container before adding the dry ingredients. It is important to note that polycarboxylate superplasticizers are highly efficient and require less water than other plasticizers.

After adding water, slowly add cement and aggregate while continuing to stir. Make sure all materials are thoroughly mixed before adding the polycarboxylate superplasticizer.

When it is time to add superplasticizer, it should be slowly poured into the mixture while maintaining constant stirring. This ensures proper dispersion and avoids clumping or uneven distribution in the concrete matrix.

Remember to continue mixing for an appropriate amount of time until the entire batch of concrete is uniform.

Pour and finish fresh concrete as usual. Pay close attention to its workability during pouring and adjust accordingly by adding more water or adjusting the mix within an acceptable range if necessary.

As long as these steps are strictly followed, you can maximize the performance and workability of your concrete mix using polycarboxylate superplasticizers!

Conclusion

Polycarboxylate superplasticizer is an important component to improve the performance and workability of concrete. These additives have unique chemical structures that offer numerous advantages over traditional plasticizers.

Different types of polycarboxylate superplasticizers have varying degrees of water reduction, slump retention and flow properties improvement. This allows greater flexibility in selecting the right additives to meet specific project requirements.

One of the main advantages of polycarboxylate superplasticizers is the ability to significantly reduce moisture content without affecting strength or durability. This provides a more sustainable and cost-effective solution as less cement is required to achieve ideal construction properties.

In addition, these superplasticizers increase the flow and cohesion of concrete mixes, thereby improving pumpability and reducing segregation. The enhanced rheological properties make the concrete easier to pour and form while maintaining its integrity.

Polycarboxylate superplasticizers are used in a wide range of applications, from residential construction projects to large-scale infrastructure developments. They can be used in a variety of concrete applications such as high-performance concrete, self-compacting concrete, precast elements, and even underwater concrete.

When using polycarboxylate superplasticizers, the manufacturer’s guidelines for correct dosage must be followed. Correct proportioning ensures optimal performance without any negative impact on setting time or early strength development.

In short, polycarboxylate superplasticizer is an essential additive in modern concrete construction. Its unique chemical structure improves workability, structural integrity and pumpability. The addition of polycarboxylate superplasticizers to concrete mixes provides many benefits, including increased workability, improved flow properties, reduced moisture content requirements, enhanced durability and improved overall performance. By judicious use of this advanced additive technology in construction projects around the world, we can achieve stronger structures that stand the test of time.

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Property and effect of Polycarboxylate ether superplasticizer (PCE) as water reducer in concrete

DONGKE UNITED — Thu, 14 Dec 2023 06:10:25 +0000

Property and effect of Polycarboxylate ether superplasticizer (PCE) as water reducer in concrete

In recent years, with the continuous development of the construction industry and the emergence of high-rise buildings, the demand for concrete is getting bigger and bigger, the strength grade is getting higher and higher, and the quality requirement is getting higher and higher.

Polycarboxylate high-efficiency water reducing agent is a kind of concrete admixture with high water reduction rate and low slump loss.

It can greatly increase the rheological properties of fresh concrete, and at the same time improve the compressive strength of hardened concrete and keep the water consumption unchanged.

It plays a vital role in the compatibility of fresh and hardened concrete. It also ensures the continuity of engineering construction, greatly shortens the construction period, promotes the development of fluid concrete technology and pumping and pouring technology, and accelerates the development of commercial concrete.

1、 The function of PCE (PolyCarboxylate Ester)

Polycarboxylate superplasticizer plays four main roles in concrete mixtures:

firstly, in order to improve the casting performance of concrete, and improve the ease of concrete without changing the composition of concrete;

Second: to reduce the water-cement ratio of mixing water and concrete under the given working conditions, and to improve the strength and durability of concrete;

Third: Reduce the amount of water and cement under the condition of ensuring the concrete casting performance and strength, and reduce the factors that cause the initial defects of concrete, such as creep, dry shrinkage, and heat of hydration of cement;

Fourth: the role of polycarboxylate superplasticizer in high-grade concrete is irreplaceable by other admixtures.. In the concrete of C50 standard or above, the ease of concrete is difficult to be achieved by other admixtures. It is expected that the improvement of concrete process performance and the breakthrough of concrete grouting technology in the future will mainly rely on the high-quality high-efficiency water reducing agent based on polycarboxylic acid polymer (PCE).

2、 The performance of PCEs :

Main technical characteristics of PCE polymer:

1. The content of polycarboxylic acid superplasticizer is low, and the water reduction rate is high.
The content of polycarboxylic acid superplasticizer accounts for 0.80% – 1.25% of the cementitious material, and the water reduction rate can reach (20% – 35)%. When used in combination with fly ash, the water binder ratio is low, and it is suitable for the preparation of medium and high strength high-performance concrete.

2. The concrete has large fluidity and low slump loss. Due to the good dispersion stability of polycarboxylate superplasticizer, the large fluidity concrete (slump ≥ 18omm) prepared by polycarboxylate superplasticizer has low time loss, basically no slump loss in one hour, and the second hour loss is less than 15%, which makes up for the defects of concrete prepared by common naphthalene superplasticizer, such as high slump loss and easy bleeding, When used in combination with fly ash, excellent fluidity can be obtained with a small amount of water reducer, which can meet the process requirements of commercial concrete production, especially for pumped concrete, pipe plugging is not easy to occur.

3. It has good adaptability to cementitious materials. In engineering practice, the cement produced by different manufacturers is used to prepare pumping concrete, and a large amount of fly ash is mixed at the same time. After the polycarboxylic acid superplasticizer is mixed, it has good compatibility with different cements, and there is no obvious bleeding segregation, which hinders the growth of concrete strength. Because of its high water reduction rate, it is suitable to be used with fly ash, reducing the shrinkage of fly ash concrete, It also significantly improves the pumpability of concrete and improves the durability of concrete. When the strength of concrete is the same, the dosage of cement increases, the dosage of water reducing agent increases slightly, the water binder ratio decreases, and the strength of concrete increases; For concrete with different design strength grades, the dosage of water reducing agent increases slightly with the increase of the dosage of cementitious materials, the water binder ratio decreases, and the strength of concrete increases accordingly, but the workability of concrete remains stable on the whole, and the slump can reach (180-240) mm.

3、 Some influencing factors of polycarboxylic acid water reducer in concrete

1.cement.

a.Influence of mineral composition of cement

The shrinkage rate of C3A, C3S, C2S and C4AF in Portland cement is C3A>C3S=C2S>C4F.
The increase of C3A and C3S content in cement clinker will increase the self shrinkage and dry shrinkage of concrete and increase the chance of cracking. C3A has the highest calorific value, and high hydration heat leads to accelerated slump loss of concrete.

b.Effect of cement fineness

Increasing the specific surface area of cement is intended to increase the rate of hydration and hence the early strength of concrete. However, most of the cement under grinding conditions, the particles increase and the exothermic heat of early hydration increases, which has no effect on improving the late strength. And the larger the cement fineness, the worse the frost resistance of concrete and the lower the tensile strength.

What’s more, the increase of cement fineness makes the compatibility between cement and high efficient water reducing agent worse. With the increase of cement fineness, the saturation point of high efficient water reducing agent dosage is greatly increased, and the dosage of high efficient water reducing agent required to reduce the loss of concrete slump is also greatly increased.

c.Influence of gypsum form on compatibility between water reducer and cement

Different forms of gypsum on the production of cement according to the cement standard product testing is not much difference, but only add water reducing agent will be different, this is due to the reducing sugar and polyol on the dihydrate gypsum, gypsum hard solubility of different (hard gypsum) and gypsum fluoride.

d.Effect of soluble alkali

Many studies have proved that the sulphate of alkali in cement, i.e. soluble alkali, has a very important influence on the adaptability of additives to cement. Studies have shown that when the C3A mass fraction is not higher than 8 per cent and the cement soluble alkali content is high, the concrete has good compatibility and low slump loss. When the soluble alkali is very low, the compatibility of concrete will be lost quickly. It is suitable for cement with low soluble alkali content. Increasing the content of high efficiency water reducers gives a larger initial slump, but the loss is still rapid. When a little is added above the saturation point, sedimentation and water secretion increase significantly.

e.Influence of other factors of cement

Factors such as cement temperature, cement ageing time, dosage, type and amount of filler will affect the workability of concrete. The higher the cement temperature, the worse the plasticising effect of the water reducing agent.

2.Fly ash

Fly ash mainly changes the ease of concrete. Due to the fine particles, it mainly fills the voids in the cement, and some of the crystal beads act as balls to increase the fluidity. With the increase of fly ash dosage, the quality of fly ash in the market varies. Generally, concrete below C50 in the mixing plant is class II, and concrete above C50 is class I. Due to the shortage of fly ash, many commercial concretes use Class III fly ash or even raw ash. Due to the large fineness, high burning loss and high water retention of Class III fly ash and raw ash, it leads to poor concrete compatibility and reduced concrete strength.

3. Mineral powder

Granulated blast furnace slag powder improves the initial fluidity of the slurry and reduces the fluidity loss. This is mainly due to the different chemical composition and fineness of different manufacturers, resulting in different water requirements of mineral powders and different contributions to concrete strength.

4. Sand and stone

The main effects on PCE-based superplasticizers water reducer are:

(1) high sand content, the mud component in concrete adsorption of water reducer, resulting in high loss of concrete. The high fineness modulus of the water reducer mainly affects the ease of concrete, and the water absorption of sand leads to the water consumption of concrete;

(2) Mud content, clay content, particle size and stone dust content of stones

The particle size in the stone determines the water consumption. The content of stone powder has a great influence on the compatibility of concrete, mainly changing the composition of stone powder below 0.315mm in concrete and affecting the compatibility of concrete.

4. Conclusion

In conclusion, cement, fly ash, mineral powder, coarse and fine aggregates in concrete will affect the adaptability of polycarboxylic acid water reducing agent, which in turn will affect the performance and quality of the final concrete product. Therefore, it is necessary to design the compatibility of the admixture with the various components it serves according to the site conditions, so that qualified materials can finally produce qualified concrete. Polycarboxylic acid high-efficiency water reducing agent plays a very important role as a kind of concrete admixture with high water reduction rate and small slump loss. It can improve the ease of concrete, increase the strength and rheological properties of concrete, thus reducing the difficulty of concrete construction in many building structures and ensuring the safety of the structure. Therefore, it will play a great role in the construction industry and produce good benefits.

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Water Reducer Superplasticizer in Construction

DONGKE UNITED — Thu, 14 Dec 2023 05:52:33 +0000

Water Reducer Superplasticizer in Construction

In modern construction, where precision and efficiency are critical, a variety of additives and materials have emerged to improve the performance and ease of concrete. One of these key ingredients is water reducer, which are superior admixtures that play a key role in shaping the performance and properties of concrete mixtures. In this comprehensive article, we delve into the world of water-reducing admixtures to reveal their significance, function, types, and the tremendous benefits they bring to construction projects.

What is a Water Reducer?

A water reducer, also known as plasticisers or super-reducers, are chemical admixtures that are carefully designed to improve the compatibility of concrete mixtures while reducing the water-cement ratio. The reduction in water content not only enhances the overall strength of the concrete, but also contributes to its durability and resistance to various environmental factors.

Key Functions of Water Reducers

water reducer are multifaceted additives with a variety of functions that make them indispensable in the construction industry. Here are some of the main roles they fulfil:

1. Improved Concrete Workability

Water reducers significantly enhance the compatibility of concrete, ensuring that it is easy to mix, pour and finish. This improved compatibility means better compaction and reduced voids within the concrete matrix, ultimately leading to higher structural integrity.

2. Higher Strength in Concrete

By reducing the water-cement ratio, water reducer help develop concrete with higher compressive strength. This strength is critical for structural stability and longevity, especially in critical applications such as bridges, high-rise buildings and industrial facilities.

3. Durability Enhancement of Concrete

Reduced permeability through the use of water reducer makes concrete more resistant to moisture penetration, chemical intrusion and freeze-thaw cycles. The increased durability extends the life of the structure and minimises maintenance and repair costs.

4. Decreased Segregation and Bleeding in Concrete

water reducer play a key role in reducing undesirable phenomena such as segregation and bleeding in fresh concrete. Segregation is the separation of coarse aggregate from the concrete mixture, while bleeding is the upward movement of excess water. Both phenomena can have a negative impact on the homogeneity and overall quality of concrete.

Types of Water Reducers

Water reducers come in various types, each catering to specific construction requirements and conditions. Some of the common types include:

1. Normal Water Reducers

These water reducer are designed to improve ease and strength in a balanced manner. They are ideal for general construction projects requiring moderate plasticity and strength.

2. Mid-Range Water Reducers

Mid-range water reducers provide more controlled levels of ease and strength improvement. They are particularly useful in projects where a specific balance between flow and cohesion is required (e.g., construction concrete).

3. High-Range Water Reducers (Polycarboxylate Superplasticizers)

Polycarboxylate Superplasticizers achieve excellent water reduction, resulting in highly workable and flowable concrete. They are typically used in scenarios requiring complex shapes, crowded reinforcement or self-compacting concrete.

Benefits of Using Water Reducers

The utilization of water reducers yields a plethora of benefits that elevate the quality and performance of concrete structures:

1. Enhanced Project Efficiency

water reducer make pumping, placing and finishing concrete easier, thus simplifying the construction process and reducing labour requirements.

2. Optimized Concrete Performance

Improved ease of use, strength and durability through water reducer enable concrete to withstand harsh environments and ensure a longer service life.

3. Eco-Friendly Construction

By reducing the water content of the concrete mixture, water reducer help to reduce overall water consumption, in line with sustainable building practices.

4. Cost Savings

Structures built with water reducer are stronger and require less maintenance, resulting in long-term cost savings for project owners and stakeholders.

In Conclusion

The incorporation of water reducer into concrete mixtures is a testament to the continued growth and innovation in the construction industry. These versatile additives enable engineers and builders to create time-tested structures that offer unrivalled strength, durability and performance. From enhancing ease of use to increasing strength, water reducer have become an indispensable tool in the advancement of modern construction practices.

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some problems in the application of polycarboxylate superplasticizerii

DONGKE UNITED — Sat, 09 Dec 2023 07:13:08 +0000

some problems in the application of polycarboxylate superplasticizerii

Compatibility of polycarboxylate superplasticizer with other admixtures

Polycarboxylic acid high efficient water reducing agent and many high efficient water reducing agents can not be mixed and formulated in any proportion like naphthalene and aliphatic high efficient water reducing agents. For example, when polycarboxylic acid and naphthalene water reducing agent are compounded, it has the most negative effect on the slump-proof of plastics, and special attention should be paid to it. This also prompts many polycarboxylic acid water reducing agent manufacturers to synthesize the mother liquor with various special functions such as slump-proof, early strength, etc., in order to adapt to the needs of concrete construction in different seasons, different materials and different mixing ratios, and ultimately achieve satisfactory results.However, it takes a period of time for the synthesis and practical application of mother liquor, and a mother liquor can not solve many problems in the engineering application of high-efficient water reducing agent. It is a necessary supplement for the application of polycarboxylic acid high-efficient water reducing agent, and it is very critical to solve the technical problems faced in the engineering site through the characteristics of the mother liquor and the physical compounding program of small materials. It is recommended to use polycarboxylic acid water reducing agent in combination with other components. Be sure to confirm the effect of compounding and the actual effect on concrete through test, and then judge whether polycarboxylic acid water reducing agent can be compounded with other components.

Storage mildew problem of polycarboxylate superplasticizer

Polycarboxylic acid high-efficiency water reducing agent in the summer high-temperature season storage, there will be the emission of bad smell, sealed packaging barrel bulging, open storage tank liquid surface floating point, strip floating and other mold phenomena. Objects often appear. The main reason is that polycarboxylic acid water reducing agent retains the natural bacterial state from the whole process of production to application and consumption, while the commonly used sugar, hydroxycarboxylate and other retardant ingredients provide fungi.Excellent nutrients, the number of fungi grows exponentially in the environment of suitable temperature and humidity and neutral pH. The fungus leaves a large number of corpses after death, which is the root cause of moldy polycarboxylic acid high-efficiency water reducing agent. Therefore, the active ingredients in the moldy polycarboxylic acid water reducing agent are not significantly affected, and the application performance is stable.

Mouldy polycarboxylic acid high-efficiency water reducing agent has a strong smell and more foam on the surface, which is not conducive to the health of workers and the accurate measurement of high-efficiency water reducing agent. Measures must be taken to inhibit it. Among them, the most effective method is to mix fungicides to achieve the effect of bacteriostatic and bactericidal. At the same time, it can also be used to adjust the pH of the water reducing agent to non-neutral (pH ≤ 3. or pH > 9.0), change the type of retarder and other methods.

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some problems in the application of polycarboxylate superplasticizerii

DONGKE UNITED — Sat, 09 Dec 2023 07:03:12 +0000

some problems in the application of polycarboxylate superplasticizerii

Dosage and water consumption of polycarboxylate superplasticizer:

(1) The replaced raw materials should be re-tested for trial mixing test and adjust the dosage to achieve the best effect;

(2) The dosage of polycarboxylic acid high-efficiency water reducing agent and the water consumption of concrete must be strictly controlled during the use;

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Introduction of polycarboxylate superplasticizers

DONGKE UNITED — Fri, 01 Dec 2023 10:00:42 +0000

Introduction of polycarboxylate superplasticizers

Classification of polycarboxylate superplasticizers

In the process of rapid economic development and technological development in China, polycarboxylic acid water reducing agent with high efficient water reducing performance is often used in construction concrete. The common ones are: polypropylene hydrochloride, methyl propionic acid, maleic acid polymer, polymaleic acid and so on. Polypropylene hydrochloride water reducing agent integrates well with other types of cement in the process of use and is widely used in the cement field. Actual use process. In the process of use, the monomer acrylic acid is used as a precursor, and polyoxymethylene is chemically combined with polyoxymethylene to obtain a higher molecular weight product. Methylpropionic acid/maleic acid polymer is a block type water reducing polymer formed with methylpropionic acid and maleic anhydride as monomers, and its performance is ensured by compounding with other water reducing agents. Flowability and Adsorption. Maleic acid is a water insoluble polymer reactive granular water reducing agent. Groups such as anhydride and molecular lactone are present in the main chain of the molecular structure. For fresh concrete, the alkaline component will hydrolyse these molecular groups, effectively converting the water-insoluble polymer into a soluble polymer, and at the same time, due to the role of the dispersant, the soluble polymer can slowly enter the solution. Hydrolysis of the concrete surface occurs gradually and slowly, and the slow dispersion effectively avoids slump loss in the concrete structure.

2. Key technologies for using the highly effective water-reducing agent polycarboxylic acid.

In recent years, polycarboxylate superplasticizers have been widely used in many construction projects in my country. Modern concrete places high demands on external functional additives, therefore, when introducing polycarboxylate water-reducing additives into concrete systems, the following key technologies should be taken into account.

(1) Polycarboxylic acid system compatibility technology. Due to the special structure of the highly effective polycarboxylic acid water-reducing agent, it cannot be stored and used together with other water-reducing agents, especially naphthalene-based water-reducing agents. If it is necessary to alternately use different types of highly effective superplasticizers, the corresponding containers must be thoroughly cleaned so that cross-contamination does not affect the quality of the concrete. The adsorption properties of high-performance superplasticizers vary depending on the type of cement. Since the compatibility range of polycarboxylate superplasticizer with cement is relatively narrow, poor compatibility is inevitable. Therefore, it is necessary to increase its dosage or use a different type of cement. to effectively solve this problem.

⑵Polycarboxylate water-reducing agent technology. In the construction process, due to the short deceleration time, the use of retarder can effectively prolong the ductility of concrete. However, the incompatibility between them should also be taken into account to avoid reducing the performance of concrete.

⑶Gas control. The polycarboxylate water-reducing agent has a good air-entraining effect and can be used in conjunction with defoamers and air-entraining agents. By first eliminating it and then introducing it, the air content of the concrete can be controlled, improving its workability and durability.

⑷Control of dirt content in sand and gravel. The dirt content of sand and gravel also affects the effectiveness of the polycarboxylate high-performance water-reducing agent. If the silt content of the sand exceeds 2%, the structure between the clay layers will absorb a large number of water-reducing agent molecules, thereby reducing the flowability of the concrete. If the mud content during construction is relatively high, the use of a clay-resistant polycarboxylate superplasticizer should be considered.

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polycarboxylate superplasticizer for sale

DONGKE UNITED — Fri, 01 Dec 2023 09:45:37 +0000

Introduction of polycarboxylate superplasticizers

Key words ：

polycarboxylate superplasticizer
Polycarboxylate concrete
polycarboxylate ether
polycarboxylate ether superplasticizer

Description

Polycarboxylate superplasticizer is a new generation of water-reducing agent based on modified polycarboxylic acid, which is especially recommended for ready-mixed concrete and civil engineering. Its special structure ensures delayed adsorption and effective dispersion of cement particles.

Uses

To obtain a high quality concrete mix with accelerated strength development and extended workability without delayed setting characteristics.
To provide a concrete mix with exceptional placing characteristics and accelerated cement hydration for early strength development and high quality concrete.
To provide improved durability by increasing ultimate strengths and reducing concrete permeability.

Typical Applications & Advantages

Provides high quality durable concrete.
Powerful plasticizing action with improved initial workability, easier installation and faster strength development.
Reduce the water-cement ratio to the maximum value that produces high-strength concrete.
Possibility of delivering high performance concrete to the construction site at any time.
It can be used alone or in combination with other admixtures to prepare specialty concrete such as pump concrete, ready-mixed concrete, etc.

Technical Support and Services Instructions for Use

It is recommended to add polycarboxylate water reducing agent to the mixing water. For ready-mixed concrete, this product can be added to fresh concrete and concrete mixer trucks. It takes about 6-8 minutes to mix on high speed.

Dosage

The optimal amount of polycarboxylate superplasticizer to meet specific requirements should always be determined by testing with materials and conditions that will be verified in use.

Dosages outside the above normal range may be determined according to the specific requirements of the mixture.

In this case please contact Dongke Group for advice.

Setting

Polycarboxylate superplasticizers provide excellent control over initial and final setting times. The setting time of a concrete mixture depends on the cement type, mixture composition and ambient temperature.

Compatibility

Polycarboxylate superplasticizers may not be used in combination with other additives without prior approval from Dongke Group.

Packaging & Storage

Polycarboxylate Superplasticizer (PC-P) is packed in 25kg / drum.
Polycarboxylate Superplasticizer (PC-F/G/E) is available in 1100 kg / IBC tank , 240 kg / drum or flexitank. For site installations, deliveries will be made in bulk to site storage tanks.
Polycarboxylate Superplasticizer has a minimum shelf life of 12 months provided it is stored under cover, out of direct sunlight.

Health & Safety Precautions

Polycarboxylate superplasticizers do not fall into the hazardous classifications of current regulations. However, it should not be swallowed or allowed to come into contact with skin or eyes. Suitable protective gloves and goggles must be used. Splashes on skin should be removed with water. In case of contact with eyes, rinse immediately with plenty of water and consult a physician. If swallowed, seek medical attention immediately and do not induce vomiting.

For more information, please see the material safety data sheet for this product.

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