Concrete viscosity regulator suitable for compatible use with polycarboxylic acid water reducer and preparation method thereof

Abstract

The invention discloses a concrete viscosity regulator suitable for compatible use with a polycarboxylic acid water reducer and a preparation method thereof; the concrete viscosity regulator comprises the components by the weight percentage: 0.1%-10% of a clay stabilizer, 0.01%-5% of an air-entraining agent, 0.001%-5% of a foam stabilizer, 0.001-10% of a thickener, and 75%-99% of water. The preparation method comprises the steps: firstly, adding water to a stirrer, fully mixing evenly other components, starting up the stirrer, after running smoothly, slowly adding the materials, and thus obtaining the concrete viscosity regulator when the materials are fully dissolved and stirred evenly. With cooperative use of the prepared viscosity regulator with the polycarboxylic acid water reducer, the polycarboxylic acid water reducer can be promoted to be adsorbed on cement particle surfaces to form a water film lubrication layer, a cement slurry steric-hinerance effect and rheological properties (the cement slurry has low plastic viscosity and higher yield stress) are effectively increased, wrapping performance on aggregates is increased while the viscosity of the concrete slurry is reduced, and thus the concrete construction performance is improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a concrete viscosity regulator suitable for use in combination with a polycarboxylate water reducer and a preparation method thereof. Background technique [0002] The typical comb-shaped molecular structure of polycarboxylate superplasticizer forms a more efficient three-dimensional dispersion system, making it have many outstanding features such as low dosage, high water reduction, good slump retention, and small shrinkage during production and use. Advantages, it is recognized as the third generation of high-performance superplasticizer, which is gradually replacing traditional aliphatic and naphthalene-based superplasticizers. At present, polycarboxylate superplasticizers have been widely used in many large-scale projects such as high-speed railways, urban rail transit, water conservancy and hydropower facilities, and nuclear power projects, and have ac...

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Problems solved by technology

[0003] Although polycarboxylate superplasticizers have been widely used in concrete, engineering practice shows that polycarboxylate superplasticizers often have insignificant technical advantages or are not suitable for use: for example, many C50, C60 or even C80 high-grade pumped concrete or prefabricated components often have high concrete viscosity during the production process with polycarboxylate superplasticizers, making it difficult to construct, especially when adding mineral admixtures to improve the durability of concrete; Polycarboxylate superplasticizers are rarely used in the production of medium and low-grade concrete with large quantities and wide areas. The main reason is that polycarboxylate superplasticizers are highly sensitive when used in medium and low-grade concrete, and production control is difficult. Concrete segregation often occurs Bleeding, poor wrapping, pumping pipe plugging, and surface stone leakage occur, which brings difficulties to construction and even engineering accidents of unqualified concrete quality

[0004] In view of the above problems, the current research status mainly focuses on the research of functionalized and serialized synthetic products of polycarboxylate superplasticizers, and there are few technical researches on improving the application performance of polycarboxylate superplasticizers by means of compounding.

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