Anti-crack high slump loss resistance concrete polycarboxylate superplasticizer

Abstract

The invention discloses an anti-crack high slump loss resistance concrete polycarboxylate superplasticizer, being prepared from the following components in parts by weight: 25-35 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 40-50 parts of isopentenol polyethylene glycol monomethyl ether macromonomer, 3.5-4.5 parts of 2-propylene acyl amino-2-methyl-1-propane sulfonic acid, 4-5 parts of allyl polyoxyethylene ether, 3-5 parts of maleic anhydride, 2.5-3.5 parts of dimethyl fumarate, 3-5 parts of hydroxyalkyl acrylate, 4-8 parts of sodium hypophosphite, 0.5-1.5 parts of tartaric acid, 80-83 parts of water and 15-21 parts of sodium hydroxide. The anti-crack high slump loss resistance concrete polycarboxylate superplasticizer has good adaptability to cement, is less in amount of admixture and high in water-reducing rate, is capable of reducing water cement ratio and improving fluidity, is low in slump loss and remarkable in early strengthening effect, and is capable of improving the compactness of concrete, saving cement, improving the working performances of the concrete and improving the durability of the concrete.

Description

technical field [0001] The invention relates to a polycarboxylate water reducer for crack-resistant high-slump concrete. Background technique [0002] Water reducer is an important concrete admixture and one of the important products in the pillar industry of new building materials. High-efficiency water reducer not only greatly improves the mechanical properties of high-strength concrete, but also provides a simple and easy construction process. So far, the development of water reducers can be divided into the following three stages: the first generation (ordinary) water reducer stage represented by wood calcium, etc., the second generation (high efficiency) mainly represented by naphthalene series The water reducer stage and the third generation (high performance) water reducer stage represented by polycarboxylic acid series. [0003] Polycarboxylate high-performance water reducer is a new type of concrete admixture first developed and applied by Japan in the mid-1980s. ...

AI Technical Summary

Problems solved by technology

In recent years, with the vigorous development of the domestic construction industry, the demand for concrete superplasticizers has increased year by year, but the supply of superplasticizers and various composite admixtures still exceeds demand, and the price is low. my country's admixture industry It has always maintained the status of low-grade products, and the overall level has not developed significantly

The limited industrial naphthalene raw materials have been far below the market demand for the production of high-efficiency concrete superplasticizers. The main raw material industrial naphthalene is lacking and the price has risen, which has led to an increase in the cost of producing naphthalene-based superplasticizers, and its prices have risen year by year in fluctuations. no longer cheap

Because the water-reducing rate of naphthalene-based water-reducing agent is not too high, the slump loss of fresh concrete is too fast, which is difficult to meet the construction requirements of actual projects, and the adaptability of composite products to cement is also unstable, and even affects the setting and hardening of concrete. Durability, as the amount of water reducing agent used in the construction market increases, the problem becomes more prominent. Therefore, a new type of non-naphthalene-based water reducing agent is urgently needed