Polycarboxylate water reducer composition for self-compaction high-workability concrete

Abstract

The invention discloses a polycarboxylate water reducer composition for self-compaction high-workability concrete. The polycarboxylate water reducer composition is composed of the following components: allyl alcohol polyoxyethylene ether, an unsaturated acid, functional monomers, an oxidizing agent, a reducing agent and a chain transfer agent, wherein the unsaturated acid consists of citric acid,acetic anhydride, acrylic acid and methacrylic acid according to a mass ratio of (1-3):(1-2):(2-3):(5-10), and the functional monomers are nano-diatomaceous earth and sulfonated melamine formaldehyderesin. According to the invention, the water reducer is synthesized by the allyl alcohol polyoxyethylene ether and the unsaturated acid, so that mixing performance of concrete can be improved, meanwhile, steel bars can be prevented from rusting, and the service life of the concrete is prolonged. Mutual reactions between cementing materials can be promoted through the functional monomers, and workability of the concrete is enhanced.

Description

technical field [0001] The invention belongs to concrete admixtures, in particular to a polycarboxylate water reducer composition for self-compacting high workability concrete. Background technique [0002] Water reducer is an important concrete admixture and an indispensable and important component of modern concrete. Polycarboxylate water reducer is used as the first generation of ordinary water reducer such as wood calcium and the second generation of high efficiency water reducer such as naphthalene series. The third generation of high-performance superplasticizer developed after the superplasticizer has a low dosage. The advantages of high compressive strength have gradually been widely used. [0003] China CN201510572153.8 patent belongs to the technical field of concrete admixture in building materials. Provided is a slow release type polycarboxylate water reducer and its preparation method and application. The slow release type polycarboxylate water reducer is synt...

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Problems solved by technology

The water reducer can play a better mud resistance, but it can not promote the bonding between concrete aggregates, and can not promote the self-compacting of concrete

[0005] Existing water reducers are highly sensitive to minerals in concrete and soil in aggregates. Due to the characteristics of polycarboxylate water reducers, they have a strong tendency to adsorb clay minerals, making fresh concrete The workability is poor, the slump loss is accelerated, and the self-compacting performance is low, which has a great impact on the production, transportation, working state and later strength of concrete; the existing polycarboxylate water reducer only has The role of reducing water consumption, and the strict requirements for mixing conditions, make the construction performance of concrete unstable, can not promote the mutual bonding between aggregates, and improve the self-compacting performance of concrete

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