Mud-resisting agent composition applied to concrete

Abstract

The invention discloses a mud-resisting agent composition applied to concrete. The mud-resisting agent composition comprises the following components: 10-70% of glycine betaine and derivative thereof, 10-70% of quaternary ammonium salt derivative and 0-80% of water. When the mud-resisting agent composition is applied to high-mud concrete, the intercalation reaction of polycarboxylic acid water reducer in the clay can be effectively reduced; high workability and working retainability of the concrete can be maintained; compared with the existing mud-resisting agent, the concrete mud-resisting agent composition is high in cost performance.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and relates to an anti-mud agent composition for concrete. Background technique [0002] Concrete is currently the most widely used building material. With the construction of domestic infrastructure, a large amount of sand and gravel aggregates have been consumed, resulting in a gradual decline in the quality of current concrete raw materials. Among them, the mud content of sand and gravel has always been a headache in construction. one question. Excessive mud content in the sand and gravel will easily lead to a sharp drop in the fluidity of the concrete, which not only affects the construction, but also causes the concrete to fail to meet the design requirements, resulting in a series of appearance and quality problems. [0003] The current research shows that the high mud content of sand and gravel leads to the decrease of concrete fluidity, mainly because the concrete admixture t...

AI Technical Summary

Problems solved by technology

Excessive mud content in the sand and gravel can easily lead to a sharp drop in the fluidity of the concrete, which not only affects the construction, but also causes the concrete to fail to meet the design requirements, resulting in a series of appearance and quality problems

[0003] The current research shows that the high mud content of sand and gravel leads to the decrease of concrete fluidity, mainly because the concrete admixture that plays a dispersive role is absorbed into the clay in the mud, especially the polycarboxylate superplasticizer, the polycarboxylate superplasticizer in its molecular structure The ether side chain is very easy to intercalate with the montmorillonite in the clay, causing the superplasticizer to be consumed by the clay and making it difficult to function, seriously affecting the constructability of the concrete

At present, there are also some patent reports on the research on anti-mud agents, such as patent CN105924026A, which reports a kind of anti-mud small material for compounding polycarboxylate water reducer, which uses sodium pyrosulfite, sodium hexametaphosphate, sodium tripolyphosphate, sodium nitrate, etc. The composition of inorganic salt, the anti-mud effect of this inorganic salt is not significant, and the excessive amount will easily lead to the decrease of concrete fluidity, and also have a certain degree of influence on the quality of concrete; patent CN105800997A reported a silane-based modified polymer Clay agent, which introduces siloxane groups into the copolymer, is a low-molecular-weight linear copolymer, which reduces the impact on the water reducing agent by adsorbing with clay, but the adsorption of soil to this polymer is not necessarily strong For polycarboxylate superplasticizers, the effect is also limited; patent CN104609756A reports a cationic concrete mud inhibitor and its preparation method, which is composed of phosphorus-containing or nitrogen-containing organic cationic polymers and inorganic salts. This quaternary phosphorus or quaternary ammonium Salt cationic polymers can be preferentially adsorbed to the surface of negatively charged clay, thereby reducing the adsorption of clay to polycarboxylate superplasticizers, but the cationic monomers used in the polymer are expensive and the production cost is high, which is not conducive to industrial production and use