A brief discussion on the research significance of polycarboxylate water-reducing agents. Have you got it?

There are still many difficulties in systematically studying new high-performance polycarboxylate water-reducing agents, but research on new high-performance polycarboxylate water-reducing agents still has important theoretical significance and practical value. With the gradual advancement of industrialization and the vigorous development of engineering construction, the application of polycarboxylate water-reducing agents in our country will become more common. However, at the same time, the development of polycarboxylate water-reducing agents is also at a bottleneck stage. On the one hand, it is restricted by the upstream Due to the cost limitation of raw material polyether or polyester, polycarboxylate water-reducing agents cannot be better promoted and applied. Many customers are still using naphthalene-based or aliphatic-based water-reducing agents. On the other hand, the use of polycarboxylate water-reducing agents It is difficult to further improve the water reduction rate and slump retention performance on the current basis. Many research and development efforts are only improvements on the original system, and no new synthetic system has been born. There are some problems that need further in-depth research on the synthesis, mechanism of action and application of polycarboxylic acid-based water-reducing agents:

First, since most water-reducing agents are synthesized in water systems , it is difficult to understand the complex interactions between different monomers;

Secondly, there are limitations in the method of characterizing water-reducing agent molecules. The relationship between the chemical structure and performance of water-reducing agents cannot be clearly explained, and there is a lack of Research on microstructure;

Third, although the compatibility of polycarboxylate water-reducing agents with cement is better than other types of water-reducing agents, in terms of concrete fluidity, when cement and external When additives are used together, phenomena such as too rapid slump loss and rapid hardening of concrete often occur. There are still problems with the compatibility of cement and chemical additives, and it is not yet fully understood how water-reducing additives work;

Fourth, in concrete using high-performance water-reducing agents, when the unit water volume decreases and the slump increases, problems such as the concrete's viscosity is too high and segregation and bleeding often occur.

The research on high-performance polycarboxylate water-reducing agents has become an important branch of concrete material science and promotes the development of the entire concrete material from low technology to high technology. Research on polycarboxylic acid-based water-reducing agents will take more comprehensive considerations from the strength, workability, durability, price and other aspects of concrete. Graft copolymerized polycarboxylic acid water-reducing agents are mainly copolymerized by unsaturated monomers under the action of initiators, and the side chains with active groups are grafted to the main chain of the polymer, so that they have high-efficiency water-reducing, Controls slump loss and shrinkage resistance, and does not affect the setting and hardening of cement.

Today, when things are changing so fast, the development and changes of polycarboxylate water-reducing agents should also follow the trend of industrialization, innovate mechanisms, and existing technologies in terms of its synthesis process, synthesis method and synthesis performance. Polycarboxylic acid still has a lot of room for improvement. The rapid development of industrial industrialization urgently requires a polycarboxylic acid water-reducing agent with higher cost performance, higher working performance and wider adaptability, and more scientific workers are needed. Keep exploring.

Looking forward to the future, the special requirements of each concrete technology require the development of optimal admixtures, and each series has many different chemical compositions. With the continuous in-depth research on the synthesis and characterization of polymer water-reducing agents and the relationship between their chemical structure and performance, polycarboxylate water-reducing agents will further develop in the direction of high performance, multi-functionality, ecology, and international standardization. It can obtain better water reduction rate and smaller slump loss, especially in preparing concrete with high fluidity and low water-cement ratio. It has unparalleled advantages of other traditional high-efficiency water-reducing agents. It will be 21 The main varieties in Century water reducing agent series.

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