Composite soil adsorbent for preventing high-content soil in concrete from adsorbing poly-carboxylic water reducer, and preparation method and using method of composite soil adsorbent

Abstract

The invention provides a composite soil adsorbent for preventing high-content soil in concrete from adsorbing a poly-carboxylic water reducer, and a preparation method and using method of the composite soil adsorbent. The composite soil adsorbent is prepared from the following raw materials by mass percent: 10 to 20% of a dispersion thinner, 5 to 10% of a retarder, 0.5 to 2.5% of an ion complexing agent, 0.2 to 0.5% of a surfactant and the balance of water. The preparation method comprises the following steps: stirring the dispersion thinner and water in a reaction kettle until the dispersion thinner is dissolved completely to obtain an even solution; adding the retarder and the ion complexing agent, and stirring until the retarder and the complexing agent are dissolved completely; finally, adding the surfactant, heating by a water bath, and stirring uniformly, so as to obtain a product. The using method comprises that the mixing amount of the composite soil adsorbent which is used cooperatively with a poly-carboxylic water reducer mother solution or replaces a part of the poly-carboxylic water reducer mother solution is 0.2 to 0.5% of that of a cementing material. By adoption of the composite soil adsorbent, the preparation method and the using method, the adsorbing of the soil to the poly-carboxylic water reducer is reduced, therefore, the comprehensive properties of the concrete are improved remarkably, and the problem of poor usability of the poly-carboxylic water reducer in the concrete with high soil content is solved.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a composite soil adsorbent for shielding high-content soil in concrete to absorb a polycarboxylate water reducer, and belongs to the technical field of building materials. The invention also relates to a preparation method and a use method of the composite soil adsorbent. Background technique [0002] In recent years, polycarboxylate superplasticizers have been favored by people in the concrete industry due to their high water reducing rate, high slump retention and environmental protection. However, in the actual application process of polycarboxylate superplasticizer, it is found that the adverse effect of soil on concrete mixed with polycarboxylate superplasticizer is very prominent. At present, the quality of coarse and fine aggregates used in concrete preparation in my country is relatively unstable, especially the crushed stone and machine-made sand used, which have high mud content...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a composite soil adsorbent that absorbs polycarboxylate superplasticizer with high content of soil in shielding concrete, which can reduce the adsorption of the soil to the concrete admixture polycarboxylate superplasticizer , so that the performance of concrete is significantly improved to solve the problem of poor performance of the polycarboxylate superplasticizer in concrete with high mud content

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