A kind of polycarboxylate superplasticizer composition and its application

Abstract

The invention discloses a polycarboxylate superplasticizer composition which is prepared from a polycarboxylate superplasticizer and an adsorption shielding agent. The adsorption shielding agent has the chemical structural formula shown as (1), wherein the value of a ranges from 0 to 100; the value of b ranges from 200 to 3000; the value of c ranges from 2 to 10; R1 represents methyl or hydrogen atoms; R2 represents methyl, hydrogen atoms, helium atoms or bromine atoms; R3 represents methyl, hydrogen atoms, helium atoms, bromine atoms or hydroxy; R4 represents methyl or hydrogen atoms. The polycarboxylate superplasticizer composition has the good clay-resisting performance, and can be used for decreasing the sensibility of concrete or mortar to gravel raw materials with high mud content.

Description

technical field

[0001] The invention relates to a concrete admixture, in particular to a polycarboxylate water reducer composition and its application. Background technique

[0002] As a new generation of cement superplasticizers, polycarboxylate superplasticizers are widely used, and compared with traditional superplasticizers, they have the advantages of high water reducing rate and good slump retention.

[0003] In recent years, the depletion of natural sand resources has made machine-made sand widely used in concrete and has gradually become the mainstream choice of concrete fine aggregate materials. However, the extensive use of artificial machine-made sand is often accompanied by many problems, especially the adaptability of polycarboxylate superplasticizers, such as increasing the water demand of concrete, damaging the workability of fresh concrete, especially greatly improving the polycarboxylate water reducer. The basic reason for the amount of superplasticizer is ...

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