Polycarboxylate composite water reducing agent suitable for low-cementitious material concrete and preparation method thereof

Abstract

The invention relates to a polycarboxylate composite water reducing agent suitable for low-cementitious material concrete and a preparation method thereof. The polycarboxylate composite water reducing agent suitable for the low-cementitious material concrete is characterized by comprising the following components in percentage by mass: 15 to 25 percent of polycarboxylic high-performance water reducing agent, 1 to 5 percent of retarder, 0 to 0.10 percent of defoaming agent, 0.01 to 0.3 percent of air entraining agent, 0.3 to 0.5 percent of preservative and the balance of water, wherein the mass solid content of the polycarboxylic high-performance water reducing agent is 40 percent. The polycarboxylate composite water reducing agent is applied to the concrete, and has the water reducing rate over 20 percent by comparing the concrete with reference concrete; and the prepared concrete has the advantages of good workability, no dissociation or bleeding, and good freezing resistance and infiltration resistance, and can be used for preparing concrete with various strength grades between C20 and C40.

Description

technical field [0001] The invention relates to a preparation method of a polycarboxylate composite water reducer suitable for concrete. This composite water reducer is especially suitable for low gelling materials (the total amount of gelling materials is less than or equal to 380Kg / m 3 ) of concrete. Background technique [0002] In recent years, polycarboxylate high-performance water reducers at home and abroad have achieved rapid development, and their application in engineering has become more and more extensive. The superior performance of this type of product has attracted the attention of the concrete engineering field. Compared with naphthalene-based superplasticizers, polycarboxylate high-performance superplasticizers have lower dosage and higher water-reducing rate; wider adaptability, better fluidity and flow retention of concrete mixtures, and lower slump loss Low and many other advantages. [0003] Because the polycarboxylate superplasticizer has the characte...

AI Technical Summary

Problems solved by technology

However, due to the poor compatibility between the polycarboxylate water reducer and the composite material; and the composite water reducer after compounding is easy to deteriorate, which affects its use to a certain extent

At present, due to technical reasons, there is no effective method to prepare a composite water reducer suitable for low-gel material concrete.

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