some problems in the application of polycarboxylate superplasticizerii
Compatibility of polycarboxylate superplasticizer with other admixtures.
Beijing Dongke United Technologies Co.,Ltd.
Compared with high-efficiency superplasticizer, high performance superplasticizer has higher water-reducing rate, better slump retention performance, less drying shrinkage, and has certain air-entraining performance.
The water reducing rate is not less than 25%, and it has better slump retention performance and less drying shrinkage than superplasticizers.
High-performance superplasticizers is a new type of admixture developed at home and abroad in recent years, mainly polycarboxylate products, it has a “comb” structure, and has a main chain with free carboxylate anion groups and a polycarboxylate.
The composition of the oxyethylene side chain can be used to produce high-performance superplasticizers with various properties and characteristics by changing the types, proportions and reaction conditions of the monomers.
Early-strength type, standard type and retardation type high-performance water reducer can be produced by introducing different functional groups by molecular design, and can also be mixed with different components.
High-performance superplasticizers agents include polycarboxylic acid-based water-reducing agents, superplasticizers acid-based water-reducing agents, and other water-reducing agents that can meet the requirements of high-performance superplasticizers agents in the “Concrete Admixtures” GB8076-2008 standard. China’s high-performance superplasticizers agents are mainly represented by polycarboxylic acid-based high-performance superplasticizers agents.
It can greatly reduce the water consumption and thus significantly improve the strength of concrete at all ages. While keeping the strength constant, cement savings of 10% or more can be achieved. The chloride ion content is very small, and it does not corrode the steel bar. It can enhance the impermeability, freeze-thaw resistance and corrosion resistance of concrete, and improve the durability of concrete.
Increase hydration efficiency, reduce unit water consumption, increase strength and save cement consumption.
Improve the workability of concrete that has not yet solidified, and prevent the segregation of concrete components.
Improve impermeability, reduce water permeability, avoid water leakage in concrete building structures, increase durability, and increase chemical corrosion resistance.
Reduce the shrinkage rate of concrete solidification and prevent cracks in concrete components.
Improve frost resistance, which is beneficial to winter construction.
It is suitable for high-strength, ultra-high-strength and medium-strength concrete, as well as concrete requiring early strength, moderate frost resistance and high fluidity.
Precast concrete components suitable for steam curing process.
It is suitable for water-reducing and reinforcing components of various composite admixtures.
There are many functions of high performance superplasticizer, the most important one is to improve the durability of concrete, and its application scope is mainly concentrated in building construction.
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Compatibility of polycarboxylate superplasticizer with other admixtures.
Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate.
Polycarboxylic acid water reducing agent with high efficient water reducing performance is often used in construction concrete.
Polycarboxylate superplasticizer is a new generation of water-reducing agent based on modified polycarboxylic acid.
Polycarboxylate (PCE) superplasticizers are known as high range water-reducing admixtures in concretes, such as ready-mix concretes, self-compacting concretes (SCC), ultra-high strength concretes (UHPC) and at the same time give an extended slump retention.
The polycarboxylic acid-based high-performance water-reducing agent, has truly designed an effective molecular structure based on the mechanism of dispersed cement. It has a super-dispersed type and can prevent concrete slump loss.