1. What type of water-reducing agent does high-performance water-reducing agent generally refer to?
There are many types of water-reducing agents. The common ones are ordinary water-reducing agents and high-efficiency water-reducing agents. In addition to water additives, there is also a high-performance water-reducing agent. So what is a high-performance water-reducing agent?
According to the definition of the national standard “Concrete Admixtures” (GB8076-2008), high-performance water-reducing admixtures refer to products with higher water-reducing rate, better slump maintenance performance, and better slump maintenance performance than high-efficiency water-reducing admixtures. For water-reducing agents with less drying shrinkage and certain air-entraining properties, the water-reducing rate should be no less than 25%.
High-performance water reducing agent is a new type of admixture developed at home and abroad in recent years. It is mainly a polycarboxylate product. It has a “comb-like” structure and contains free carboxylic acids. It consists of the main chain of anionic groups and polyoxyethylene side chains. By changing the type, proportion and reaction conditions of monomers, high-performance superplasticizers with various properties and characteristics can be produced. Early-strength, standard and retardant high-performance water-reducing admixtures can be produced by introducing different functional groups through molecular design, or can be compounded by incorporating different components.
2. What are the characteristics of high-performance water reducing agent
High-performance water-reducing agent has stronger performance than ordinary water-reducing agent and high-efficiency water-reducing agent. Its main features are:
1. Low dosage (calculated based on solid content, generally the quality of cementitious materials 0.15%~0.25%), high water reduction rate.
2. The concrete mixture has good workability and workability retention.
3. The content of chloride ions and alkali in the admixture is low.
4. The shrinkage rate of concrete prepared with it is smaller, which can improve the volume stability and durability of concrete.
5. Good adaptability to cement.
6. The production and use process does not pollute the environment and is an environmentally friendly water-reducing agent.
7. It greatly improves the performance of concrete and can greatly improve the durability, mechanical properties and dimensional stability of concrete.
High-performance water-reducing admixtures are mainly used to prepare low water-cement ratio, high-strength, self-compacting and high-durability concrete. They are the main development direction of concrete water-reducing admixtures.
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