Anti-segregation agent for concrete and preparation method thereof

Abstract

The invention relates to an anti-segregating agent used for concrete. The anti-segregating agent is obtained by copolymerisation of 30 to 100 weight parts of a monomer A, and 20 to 160 weight parts of a monomer B; wherein the monomer A is one, or a mixture of more than two, mixed at a random ratio, selected from acrylamide, N-methylol acrylamide, acrylic acid and methylacrylic acid randomly; the monomer B is one, or a mixture of more than two, mixed at a random ratio, selected from hydroxyethyl acrylate, hydroxyethyl methylacrylate, hydroxy-propyl acrylate, hydroxypropyl methacrylate and TPEG. Compatibility of the anti-segregating agent with concrete is excellent, strength development of concrete is not influenced, concrete segregation and weeping in construction sites are avoided effectively, segregation resistance of concrete is increased, and pumping of concrete is easy.

Description

Technical field [0001] The invention relates to an admixture for concrete, in particular to an anti-segregation agent for concrete 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. The fluidity of concrete has developed from the previous 70~90mm to the current 180~230mm slump. Some projects also use self-compacting concrete, and the pumping height is getting higher and higher. In order to facilitate construction, pumped concrete needs to have greater fluidity and maintain this performance for a certain period of time, that is, it requires small slump loss, no bleeding, and no segregation. At present, the quality of aggregates in our country is getting worse and worse, the porosity of sand and gravel is getting bigger and bigger, the natural sand is almost exhausted, and the content of particl...

AI Technical Summary

Problems solved by technology

At present, 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 particle 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 have caused many pumped concrete to be 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 site has to return the concrete

[0003] The existing products on the market that can be used for anti-segregation of concrete include polyacrylamide, sulfonated polyacrylamide, sulfomethyl phenolic resin, polystyrene sulfonic acid, etc., but due to its strong flocculation effect, it will lead to concrete settling The speed is fast, and the concrete loses its fluidity in an instant, which is unfavorable to the workability of the concrete

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