Early strength polycarboxylic acid type water reducer, as well as preparation method and application thereof

Abstract

The invention discloses an early strength polycarboxylic acid type water reducer, as well as a preparation method and application thereof. The water reducer is composed of the following raw materials in parts by weight: 25-35 parts of acrylic acid, 7-15 parts of lygodium japonicum, 12-20 parts of polymine and 1-5 parts of polysorbate. The method comprises the following steps: mixing and thermally stirring lygodium japonicum and polymine solution; adding polysorbate and thermally treating; adding acrylic acid and ultrasonically treating; centrifugally treating and taking filter liquor; and thermally stirring and treating, thereby acquiring the water reducer. The early strength polycarboxylic acid type water reducer has the advantages that the early strength effect is excellent, the cost is lowered, and the performance is stable; under the synergistic effects of all the raw materials, the water reduction efficiency of the early strength type water reducer is greatly increased; the flowing property of the net paste is excellent; the bleeding rate and the air content are reduced; the air content is greatly reduced and the initial setting time and final setting time of the concrete are greatly shortened; the durability is increased; and the early strength polycarboxylic acid type water reducer is suitable for low temperature, can be used at -10 DEG C and can be used for effectively solving the problem of slow development of concrete strength under the low temperature condition.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to an early-strength polycarboxylic acid type water reducer and a preparation method and application thereof. Background technique [0002] Compared with naphthalene series, melamine series, sulfamate and other water reducing agents, polycarboxylate water reducing agent has become the representative of the latest concrete admixture due to its excellent performance. In recent years, my country has made rapid development in the research and application of polycarboxylate superplasticizers, but the variety is relatively single, and the research on application technology is not sufficient, and it still cannot meet the diverse requirements of different projects and different regions for superplasticizers. In building construction, in order to increase the early strength of concrete rapidly, it is necessary to add a certain amount of early strength water reducing agent to the c...

AI Technical Summary

Problems solved by technology

However, the comprehensive performance of early-strength polycarboxylate superplasticizers is poor, such as high air content, long initial setting time and final setting time, etc., which cannot meet the requirements of some special occasions.

Although sodium sulfate has a good early strength effect, it has an adverse effect on the later strength of concrete; while triethanolamine and high-efficiency water reducer, although effective in application, are expensive and are only used in special cases

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