High-temperature-resistant stone powder adsorption-resistant slump-retaining polycarboxylate superplasticizer and preparation method thereof

Abstract

The invention discloses a high-temperature-resistant stone powder adsorption-resistant slump-retaining polycarboxylate superplasticizer and a preparation method thereof. The polycarboxylate superplasticizer is prepared from the following components in parts by weight: 320 to 360 parts of unsaturated polyether macromonomer, 20 to 30 parts of unsaturated monocarboxylic acid, 6 to 10 parts of maleimide alkyl acid, 5 to 8 parts of unsaturated phosphate, 2 to 5 parts of unsaturated amino acid monoester, 2.5 to 5.0 parts of oxidant, 0.5 to 1.0 part of reducing agent and 1 to 3 parts of chain transfer agent. The pH value of the water reducing agent is 5.0-7.0, and the solid content of the water reducing agent is 40%-42%. The polycarboxylic acid water reducing agent can effectively solve the problems of insufficient initial fluidity of concrete, too fast slump loss and poor workability of a concrete mixture caused by incapability of simultaneously meeting high temperature resistance and limestone powder adsorption resistance of the existing water reducing agent, and has great significance in widening the engineering application field of the water reducing agent.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a high-temperature-resistant, stone powder-resistant, slump-resistant polycarboxylate water-reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is the most widely used concrete admixture at present. It has outstanding advantages such as low dosage, high water reducing rate, good slump retention performance, strong molecular structure adjustability, simple production process, green and pollution-free, etc. , Widely used in the field of engineering construction and building structures. [0003] In recent years, with the rapid development of my country's infrastructure construction, the demand for concrete has increased year by year, and the use of concrete raw materials has also increased. With the adjustment of the national energy strategy and the development and progress of the electric power field, thermal power g...

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Problems solved by technology

[0006] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a polycarboxylate water-reducer with high temperature resistance, stone powder adsorption and slump retention and a preparation method thereof, which can effectively solve the problems of existing water-reducers. The problems of insufficient initial fluidity of concrete caused by high temperature resistance and anti-limestone powder adsorption, excessive slump loss, and poor workability of concrete mixtures are of great significance for expanding the engineering application field of water reducing agents.

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