Concrete water reducing agent as well as preparation method and application thereof

Abstract

The invention provides a concrete water reducing agent as well as a preparation method and application thereof. The preparation method of the concrete water reducing agent comprises the following steps: step 1, uniformly mixing graphene oxide and water, adding solid alkali, and reacting with 2-chloroacrylic acid to prepare carboxylated graphene dispersion liquid; step 2, adding methyl allyl polyoxyethylene ether or isopentenyl polyoxyethylene ether into the carboxylated graphene dispersion liquid, uniformly mixing, adding an initiator, and uniformly mixing; 3, respectively preparing a water solution I mixed by a chain transfer agent and a reducing agent and a water solution II of an olefine acid compound; step 2, simultaneously dropwise adding an aqueous solution I and an aqueous solution II into the mixed solution obtained in the step 2 at 45 DEG C or below, controlling the dropwise adding time of the aqueous solution I and the aqueous solution II to be 2-3.5 hours, after dropwise adding is completed, carrying out heat preservation reaction for 1-2 hours, and after the reaction is completed, regulating the pH to 6.8-7.2 by adopting a pH regulator. The concrete water reducing agent disclosed by the invention can be effectively used as a special water reducing agent for concrete, and has excellent water reducing effect and slump retaining effect.

Description

technical field [0001] The invention belongs to the technical field of concrete building materials, and in particular relates to a concrete water reducer and its preparation method and application. Background technique [0002] In recent years, China has increased its internal infrastructure construction and actively participated in the export of key foreign engineering projects and high-speed rail technology. This is inseparable from the improvement of high-performance concrete technology. Concrete admixtures, especially polycarboxylate superplasticizers ( PCE) also present higher and more diverse demands. Predecessors have done a lot of work on the preparation, performance, application and mechanism of action of PCE, and have achieved certain results. However, in terms of basic theoretical research, due to different research systems and set boundary conditions, researchers have drawn different or even contradictory conclusions on the relationship between PCE molecular str...

AI Technical Summary

Problems solved by technology

At present, there is a method of compounding retarding components in PCE. Although this method can improve the slump of concrete to a certain extent, it still cannot fully meet the requirements of slump retention performance, and it will also cause the concrete to set for too long. intensity is affected

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