A polycarboxylate water reducer for high mud-containing concrete and its synthesis method

Abstract

The invention provides a polycarboxylic acids water reducer used for a high mud concrete, a structure is shown in a general formula (I), wherein, R1 and R3 is alkyl with 1-3 H or carbon atoms; R2 is alkylene with 1-20 of carbon atoms; BO is an ordered block or an disorder hybrid block formed between one or more of -C2H4O<->, -C3H6O<-> and -C4H8O<->; n is a positive integer from 10 to 120; m is a positive integer from 40 to 70; and n, x, y and z are all positive numbers. The water reducer has the advantages of simple preparation technology and good anti-soil adsorptivity. (img file='DDA00002330076300011.TIF' wi='1454' he='681' / ).

Description

technical field [0001] The invention relates to a novel water reducer, in particular to a polycarboxylate water reducer for concrete with high mud content and a preparation method thereof. Background technique [0002] The largest component of concrete is aggregate, accounting for about 75% of the volume of concrete. The mud content in concrete is basically brought in by the aggregate. Usually, the mud powder is wrapped on the surface of the aggregate, hindering the cohesion between the aggregate and the cement, forming a relatively weak interface layer, and affecting the bonding force between the cement and the aggregate in the concrete; sometimes the mud powder will gather into agglomerates and become concrete The weak area in the concrete will affect the mechanical properties and construction performance of concrete. [0003] The particles of mud are generally small, usually less than 0.05mm. The solid phase components are minerals and organic matter, accounting for hal...

AI Technical Summary

Problems solved by technology

This will increase the specific surface area of ​​the soil, making the polycarboxylate superplasticizer intercalate between the clay mineral layers, and a small amount of clay can absorb a large amount of superplasticizer, which shows that the construction performance of concrete becomes very poor, and some even difficult to construct

At the same time, with the increase of mud content, the carbonation depth of concrete increases obviously, and the anti-carbonation ability gradually deteriorates; the shrinkage of concrete increases, which has an adverse effect on the durability of concrete

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