With the advancement of science and technology, the concrete industry has developed rapidly. Mud inhibitors, water-reducing agents, coagulants, etc. have become an indispensable element in the industry. Polycarboxylate water-reducing agents play an important role in cement mixing products. However, during the construction process, due to the influence of the mud content of the sand and gravel, the adaptability of the water-reducing agent has declined to varying degrees, which has brought varying degrees of difficulties to the cost control of the project and the convenience of construction. According to the survey: With the construction of more and more large-scale projects, there are great difficulties in obtaining high-quality sand and gravel materials. In order to improve the quality of concrete when using ordinary sand and gravel materials, it is necessary to adsorb the mud in the sand and gravel materials and reduce the viscosity. The emergence of mud inhibitors has saved this situation. Finding a better concrete mud inhibitor is the unanimous goal of many people in the industry.
The main reason for choosing a good concrete anti-mud agent is that it is very friendly to the workability of the cement mixture. The improvement of its workability during pumping is mainly reflected in:
A. Flow Properties: Anti-sludge agents can significantly improve the carbonation resistance of concrete, while stimulating the activity of its admixtures, effectively improving the fluidity of the mixture and increasing its slump by 20-30mm to meet construction requirements.
B. Cohesion: Anti-mud agent can improve the wrapping performance of medium mortar on stones, prevent sand and gravel from separating during pumping, and help improve the cohesion of pumping.
C. Water retention: Anti-sludge agent can adjust the pumping uniformity and pumpability, reduce the bleeding rate, and make the construction smoother.
The adjustment mechanism of anti-mud agents in concrete admixtures:
The additives used in polycarboxylate water-reducing admixtures with high mud content are “anti-mud agents”. This This kind of anti-sludge agent can effectively inhibit and adsorb the impact of high mud content in sand and gravel on polycarboxylic acid-based water-reducing agents during mixing, improving its cost performance, so that the polycarboxylic acid-based water-reducing agent can fully demonstrate its performance The advantages. Generally, it can only be solved by increasing the concentration of polycarboxylic acid water-reducing agent or increasing the dosage. However, when increasing the amount of polycarboxylic acid-based water-reducing agent, it will not only increase the cost, but also cause severe segregation and bleeding in its initial state, which increases the difficulty of construction to a certain extent and also limits the use of polycarboxylic acid-based water-reducing agents. The use of water-reducing agents is promoted. However, in response to the above-mentioned problems, a large amount of sand and gravel with high mud content are directly used in concrete mixing. This is a common phenomenon. This will have adverse effects on the workability, strength and durability of the concrete mixed with polycarboxylic acid-based water-reducing agents, manifested in reduced fluidity, rapid loss of slump retention, and sometimes causing the collapse of polycarboxylic acid-based water-reducing agents. Major failure.
Effective concrete mud inhibitors can improve the quality of construction. During the process of reconfiguring the mud inhibitors of Qingdao Dingchang New Materials Co., Ltd. and pumping agents, adding 3-8Kg can effectively improve the fluidity. Increase expansion, improve mud resistance, and reduce slump loss over time
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