Viscosity-reducing water reducing agent and preparation method and application thereof

Abstract

The invention relates to a composition for preparing a viscosity-reducing water reducing agent. The composition comprises a polyether macromonomer, a diethylene glycol maleic anhydride monoester monomer, a sodium methylallyl sulfonate monomer, an acrylic acid monomer, and an optional initiator, a reducing agent and a chain transfer agent. According to the novel viscosity-reducing water reducing agent, the polycarboxylic acid water reducing agent with a viscosity reducing function is synthesized in a water solution through a copolymerization reaction of an oxidation-reduction initiating system under the action of initiation of an oxidation-reduction system, a chain transfer agent and the like, and the water reducing agent is applied to concrete engineering and aims at adjusting the thickness of a water film layer of the viscosity-reducing water reducing agent on the surface of cement particles, and realizing a lubricating effect, and thus the viscosity of the concrete is reduced, the working performance of the concrete is improved, and the problems of high viscosity and low flow rate of high-grade concrete are solved.

Description

technical field [0001] The invention belongs to the field of construction, and in particular relates to a viscosity-reducing and water-reducing agent and a preparation method and application thereof. Background technique [0002] With the rapid development of the construction industry, building structures are gradually developing in the direction of super high-rise, large-span and complex structural systems, which put forward higher requirements for the mechanical properties and construction performance of concrete, and greatly promote the construction technology of concrete pumping development of. However, the use of high-strength concrete with a low water-to-cement ratio often brings problems such as high viscosity and slow flow rate of freshly mixed concrete, which makes construction more difficult. Therefore, it is imminent to solve the problem of reducing the viscosity of high-grade concrete. The way to reduce the viscosity of high-strength concrete is mainly achieved...

AI Technical Summary

Problems solved by technology

The method of reducing the viscosity of high-strength concrete by increasing the amount of water-reducing agent will increase the cost of materials used, and at the same time cause the problem of excessive retardation, prolong the progress of construction, and may even cause problems such as bleeding, which will invisibly give Construction has increased a lot of difficulty

Reduce the viscosity of high-strength concrete by optimizing the gradation of cementitious materials. Although there have been many studies in this area, there are still relatively large limitations. The workability of fresh concrete mainly depends on the role of water reducers. , the method of optimizing the gradation of cementitious materials cannot solve the fundamental problem

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