Mud concrete retarder composition and application thereof

Abstract

The invention belongs to the technical field of building admixtures, and discloses a mud concrete retarder composition and application thereof. The mud retarder composition is composed of 10-60% of organic phosphonic acid compounds, 10-60% of A quaternary ammonium salt cationic lignosulfonate copolymer and 0-80% of water. The mud concrete retarder disclosed by the invention can effectively reducethe consumption of a polycarboxylate superplasticizer in concrete with high mud content of sandstone materials, improves the initial fluidity and slump retention capacity of the concrete, and can be compounded with the polycarboxylate superplasticizer for use.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and relates to a mud-repelling agent composition for concrete and an application thereof. Background technique [0002] With the vigorous development of infrastructure construction, the raw materials of concrete are also facing the problem of resource shortage. The high mud content of sand and gravel is a common problem in practical engineering. Sand and gravel with high mud content are likely to cause rapid loss of concrete fluidity and affect construction. Performance will not only cause waste of raw materials, but also seriously affect the strength and durability of the entity. [0003] At present, a large number of studies have shown that the main reason why the mud contained in sand and gravel has a greater impact on the workability of concrete is that the main component of mud is layered clay, and polycarboxylate superplasticizers are easy to intercalate into the clay layer, gre...

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Problems solved by technology

[0002] With the vigorous development of infrastructure construction, the raw materials of concrete are also facing the problem of resource shortage. The high mud content of sand and gravel is a common problem in practical engineering. Sand and gravel with high mud content are likely to cause rapid loss of concrete fluidity and affect construction. Performance will not only cause waste of raw materials, but also seriously affect the strength and durability of the entity

[0003] At present, a large number of studies have shown that the main reason why the mud contained in sand and gravel has a greater impact on the workability of concrete is that the main component of mud is layered clay, and polycarboxylate superplasticizers are easy to intercalate into the clay layer, greatly Increase the consumption of polycarboxylate superplasticizer, thereby weakening the dispersibility of polycarboxylate superplasticizer to cement

In order to reduce the amount of intercalation of polycarboxylate superplasticizers in clay, some patents have reported anti-mud agents or mud-repelling agents, such as the publication number CN105731862A reported with sodium silicate or dodecyltrimethylammonium chloride The mixture is clay lattice intercalation to change the composition, but sodium silicate will activate clay cations and increase the interlayer spacing of clay, while dodecyltrimethylammonium chloride can be limitedly intercalated into clay to reduce polycarboxylation. Adsorption of acid water reducer, but it has good compatibility with cations, and the composite effect with anionic polycarboxylate water reducer is poor, which will reduce the water reducing rate of polycarboxylate water reducer; the publication number is CN105924026A report Sodium pyrosulfite, sodium hexametaphosphate, sodium tripolyphosphate, sodium nitrate and other inorganic salts are used for anti-mud small materials. The anti-mud effect of these inorganic salts is not good, which will affect the hydration reaction of cement, such as sodium pyrosulfite And phosphate can delay cement hydration, and sodium nitrate even has coagulation accelerator; Publication number is that CN105949383A discloses a kind of cationic anti-mud agent, and this material can improve the anti-mud property of polycarboxylate superplasticizer, but in concrete In the system, because the surface of cement particles is positively charged, this substance has no dispersibility to cement, and additional addition will greatly increase the cost, and the cost performance is low

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