Clay-resistant polycarboxylate water-reducer compoundable with naphthalene-based water-reducer and preparation method thereof

Abstract

The invention relates to an anti-clay polycarboxylate water reducer capable of being compounded with a naphthalene water reducer and a preparation method thereof. The anti-clay polycarboxylate water reducer is prepared from the following raw materials: a comonomer, a chain transfer agent, an initiator and deionized water. The preparation method comprises the following steps: adding the deionized water into a four-mouth flask and heating to 60-80 DEG C; filling the comonomer, the chain transfer agent and the deionized water in a beaker to prepare a solution A; filling the initiator and the deionized water in another beaker to prepare a solution B; respectively, simultaneously and uniformly dropping the solutions A and B into the four-mouth flask by a constant flow pump, and after reaction, cooling and adjusting the pH value to 6.5-7.0 to obtain the anti-clay polycarboxylate water reducer. The polycarboxylate water reducer provided by the invention can be compounded with the naphthalene water reducer in use, so that the problem that the prior art, the polycarboxylate water reducer and the naphthalene water reducer are incompatible is solved. The anti-clay polycarboxylate water reducer is good in anti-clay performance and can be used for remarkably improving the working performance of high silt content aggregate prepared concrete, and the fresh concrete is good in peaceability, less in gradual loss, high in strength and suitable for industrial production.

Description

technical field [0001] The invention relates to a concrete admixture, in particular to a polycarboxylate water-reducer, belonging to the technical field of building materials, in particular to a clay-resistant polycarboxylate water-reducer that can be compounded with a naphthalene-based water-reducer. The invention also relates to a preparation method of the polycarboxylate water reducer. Background technique [0002] In recent years, polycarboxylate superplasticizers have been favored by people in the concrete industry due to their advantages such as high water reducing rate, low dosage, good cement adaptability and environmental protection. However, in the actual application process, it was found that the adverse effect of soil on concrete mixed with polycarboxylate superplasticizer is very prominent. In the past, sand and gravel with stable quality, good particle gradation and low mud content are less and less, especially in industrial and civil construction projects, a ...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a clay-resistant polycarboxylate water-reducer that can be compounded with naphthalene-based water-reducers. Carboxylic acid superplasticizer is incompatible with naphthalene-based superplasticizers. At the same time, it has good clay resistance and can significantly improve the workability and slump retention of concrete with aggregates with high mud content. The loss of freshly mixed concrete is small over time. , Hardened concrete has high strength and good durability

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