Liquid anti-segregation agent and preparation method thereof

Abstract

The invention provides a liquid anti-segregation agent, which comprises: 40-50 weight parts of a monomer A, 2-6 weight parts of a monomer B, 0.1-1 weight part of a chain transfer agent, 1-5 weight parts of an initiator, and 150-200 weight parts of water. Specifically, the monomer A is any one of or a mixture of several of 2-acrylamide-2-methylpropanesulfonic acid, methylallyl polyoxyethylene ether, sodium methallyl sulfonate and sodium allyl sulfonate, the monomer B is any one of or a mixture of several of N, N-dimethacrylamide, acrylamide, N-hydroxymethyl acrylamide, acrylic acid and methacrylic acid, the initiator is a 30wt% hydrogen peroxide aqueous solution and ascorbic acid, and the chain transfer agent is mercaptoethanol. The liquid anti-segregation agent provided by the invention has the function of reducing the surface tension of concrete while having water retaining capacity, and can maintain the viscosity and fluidity of concrete.

Description

technical field [0001] The invention relates to the field of concrete admixtures, in particular to a liquid anti-segregation agent and a preparation method thereof. Background technique [0002] As the largest building material, concrete has developed by leaps and bounds. In recent years, high-strength and high-performance concrete has been widely used in engineering. [0003] However, the fluidity and cohesion of concrete are often contradictory, that is, it is difficult for concrete to maintain high cohesion in a large fluid state. In this way, the pursuit of high fluidity is prone to bleeding and segregation. In addition, the quality of aggregates in our country is getting worse and worse, the void ratio of sand and gravel is getting bigger and bigger, natural sand is almost exhausted, and the content of particles with a particle size above 4.75mm in machine-made sand is high. In this case, due to the large fluidity of concrete Demand will inevitably lead to an increase...

AI Technical Summary

Problems solved by technology

[0003] However, the fluidity and cohesion of concrete are often contradictory, that is, it is difficult for concrete to maintain high cohesion in a large flow state.

In this way, the pursuit of high fluidity is prone to bleeding and segregation

In addition, the quality of aggregates in our country is getting worse and worse, the void ratio of sand and gravel is getting bigger and bigger, natural sand is almost exhausted, and the content of particles with a particle size above 4.75mm in machine-made sand is high. In this case, due to the large fluidity of concrete Demand will inevitably lead to an increase in water consumption and slurry-bone ratio in concrete

The fluctuation of raw materials in the concrete mixing plant and the problem of construction organization lead to many pumped concrete being in an unstable state of segregation and bleeding at the construction site. This kind of concrete is very easy to block the pump during pumping, which brings trouble to the construction. In severe cases, the construction party has to return the concrete, and the quality control of ready-mixed concrete is facing increasingly severe challenges

Existing anti-segregation agents for concrete have a strong flocculation effect, which leads to rapid concrete settling speed, and the concrete loses its fluidity instantly, which is unfavorable to the workability of concrete

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