Compatibility of polycarboxylate superplasticizer with other admixtures.
High Performance Superplasticizer - The Best Concrete Admixture
High performance superplasticizer and its classification
1. Introduction of high performance superplasticizer
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.
2. Classification of high performance superplasticizers
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.
The function of high performance superplasticizer
- The high performance superplasticizer has a strong dispersing effect on cement, which can greatly improve the fluidity of the cement mixture and the slump of concrete, and at the same time greatly reduce the water consumption and significantly improve the workability of concrete. However, some high performance superplasticizers will accelerate the loss of concrete slump, and if the dosage is too large, it will cause bleeding. high performance superplasticizer basically does not change the setting time of concrete. When the dosage is large (overdosage), it has a slight setting retardation effect, but it does not delay the growth of the early strength of hardened concrete.
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.
Application of high performance superplasticizer
- It is suitable for prefabricated and cast-in-place reinforced concrete in various industrial and civil construction, water conservancy, transportation, port, municipal and other projects.
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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Polycarboxylic acid high-efficiency water reducing agent is characterized by low dosage and high water reducing rate.