Beijing Dongke United Technologies Co.,Ltd.

Admixture dosage in concrete?

Concrete additives

Concrete admixture is a chemical substance that is mixed in the process of mixing concrete and accounts for less than 5% of the cement mass, which can significantly improve the performance of concrete. The characteristics of concrete admixtures are that they have many varieties and small dosages, which have a greater impact on the performance of concrete. They have the characteristics of low investment, quick results, and significant technical and economic benefits. With the continuous advancement of science and technology, admixtures have been increasingly used, and admixtures have become the fifth important component of concrete in addition to the 4 basic components.

Admixtures can improve the anti-carbonization performance of concrete. There is a certain linear relationship between the carbonation depth and porosity of concrete; admixtures have a great influence on the frost resistance of concrete. Concrete with air-entraining water-reducing agent is anti-freezing The performance is better, but the early strength agent alone has no effect on the frost resistance of concrete.

Used to adjust or improve the rheological properties of concrete mixtures:1.Water-reducing admixture 2.Superplasticizer 3.Setretarder superplasticizer 4.Hardening accelerating and water-reducing admixture 5.Setretarding and water-reducing admixture 6.Pumping aid.

Water reducer is a concrete admixture that can reduce the water consumption for mixing while maintaining the slump of concrete basically unchanged. After adding the concrete mixture, it can disperse the cement particles, which can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement

The polycarboxylate high-performance water-reducing agent is a kind of concrete superplasticizer (water-reducing agent) with the most advanced technology, the highest technological content, the best application prospect and the best comprehensive performance in the world. Polycarboxylic acid high-performance water reducing agent is a compound product of carboxylic acid grafted multi-element copolymer and other effective additives. The performance comparison with similar products at home and abroad shows that the polycarboxylic acid series high-performance water reducing agent has reached the current international advanced level in terms of technical performance indicators and cost performance.

DK-100 is a specifically designed polycarboxylate superplasticizer which owns excellent dispersion performance while maintaining good retention effects due to our cutting-edge processing technique; It has a wide range of applications as used in the industrial fields of normal concrete,pumping concrete,as well as self-compacting with high strength & durable concrete projects.

DK-200 is a specifically designed polycarboxylate superplasticizer which exhibits excellent slump retention effects due to our cutting-edge processing technique; it is a non-toxic.non-flammable environmentally friendly product which has a wide range of applications as used in the industrial fields of normal concrete,pumping concrete,as well as self-compacting with high strength &durable concrete projects.

Compared with traditional superplasticizers such as naphthalene series, polycarboxylic acid series superplasticizers have many unique technical performance advantages:

(1) low dosage and high water reduction rate;

(2) for concrete mixture Good fluidity retention;

(3) Good compatibility with cement;

(4) The prepared concrete has a small shrinkage rate, which is beneficial to improve the volume stability and durability of concrete;

(5) Environmental protection and pollution-free during production and use , Belongs to the green admixture.

It is precisely because of the above-mentioned performance advantages that polycarboxylic acid-based high-performance water-reducing agents have attracted wide attention in the domestic engineering community in recent years.

Many important projects have used this new type of water-reducing agent in large quantities, such as Shanghai Maglev, Shanghai World Financial Center, Hangzhou Bay Bridge, Donghai Bridge, Beijing Yintai Building, Beijing Capital International Airport expansion project, etc. It is foreseeable that, due to the above-mentioned unique performance advantages, polycarboxylic acid-based high-performance water-reducing agents will quickly become mainstream products in the water-reducing agent market.

Polycarboxylic acid-based high-performance water-reducing agents are mostly in liquid state. Recently, due to the improvement of technology, the powdering process has been improved, and polycarboxylic acid-based high-performance water-reducing agents in powder state have become more common. In contrast, products in powder form provide a lot of convenience from transportation to customer use. Since then, powder has formed the development trend of such products.

Performance characteristics:

Low dosage, high water reduction rate, the water reduction rate can be as high as 45%;

When the slump is light, the loss is small. The slump loss rate of ready-mixed concrete is less than 5% in 1h and less than 10% in 2h; the reinforcement effect is significant, the 3d compressive strength of concrete is increased by 50~110%, and the 28d compressive strength is increased by 40~80% , 90d compressive strength increased by 30-60%; concrete workability is excellent, no segregation, bleeding phenomenon, uniform appearance of concrete color. When used in the preparation of high-grade concrete, the concrete has good cohesion and easy mixing; moderate air content, no adverse effect on the elastic modulus of concrete, good frost resistance; it can reduce the early hydration heat of cement, which is beneficial to mass concrete and Summer construction;

Excellent adaptability, good compatibility of cement and admixtures, good temperature adaptability, good compatibility with different types of cements and admixtures, and solves the problem of poor compatibility between other types of water-reducing agents and cementitious materials The problem; low shrinkage can significantly reduce the shrinkage of concrete, and the freeze-thaw resistance and carbonization resistance are significantly better than ordinary concrete; significantly improve the volume stability and long-term durability of concrete; the alkali content is extremely low, and the alkali content is less than 0.2%, which is effective To prevent the occurrence of alkali-aggregate reactions

The product has good stability, no stratification or precipitation during long-term storage, and no crystallization at low temperature; the product is environmentally friendly, does not contain formaldehyde, and is an environmentally friendly product; it has good economic benefits, and the overall project cost is lower than other types of products. Cement can be saved by 15-25% under strength conditions.

Our new powder products DK-605 and 606 now gets lots of sample testing feedback from customers, their testing result is great, and some customers now developing very stable monthly purchasing. We offer free sample for your testing and be glad to offer you specifications for the better product performance.

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