Multi-branched polycarboxylic water reducer with excellent function of slump protection and preparation method thereof

Abstract

The invention relates to a plastic retaining agent for newly mixed cement paste, mortar, concrete and the like, in particular to a multi-branched polycarboxylic water reducer with an excellent function of slump protection and a preparation method thereof. The water reducer is prepared with the following monomers through aqueous solution polymerization under the effect of a polymerization initiator: a monomer a of 30-60 percent of the total weight of reactants, a monomer b of 20-50 percent of the total weight of the reactants, a monomer c of 10-30 percent of the total weight of the reactants, and a monomer d of 5-15 percent of the total weight of the reactants. The multi-branched polycarboxylic water reducer still has an excellent performance of maintaining the plasticity of the concrete under the low dosage, and even in construction at the high temperature in summer, the slump loss of the fresh concrete is small, the scope of application in the cement is wide, and no obvious delayed coagulation occurs to the concrete. Therefore, the invention greatly improves the early and late strength of the concrete.

Description

technical field [0001] The invention relates to a plastic retaining agent for freshly mixed cement slurry, mortar, concrete, etc., in particular to a multi-branched polycarboxylate water reducer with excellent slump retention performance and a preparation method thereof. technical background [0002] With the rise and rapid development of a large number of projects such as transportation, water conservancy, bridges, and municipal engineering, concrete, as the most basic material of construction, plays an increasingly important role. Especially in recent years, the construction of some major national projects has increased the performance requirements of concrete according to the design standards of a century-old project. Not only are the requirements for traditional testing indicators constantly increasing, but the durability of concrete and the service life of concrete are more concerned by the construction industry. At the same time, for different projects, the constructi...

AI Technical Summary

Problems solved by technology

Not only the production process is cumbersome, but many cross-linking agents have poor water solubility. If the cross-linking effect is not ideal, the state of the water reducing agent will be greatly affected, and turbidity and stratification will occur.

[0007] In view of the above phenomena and the problems existing in some engineering applications, some domestic efforts have been made to solve the loss of concrete slump, but it is not ideal.

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