A kind of high temperature resistant phosphonic acid-based concrete retarder and its preparation method

Abstract

The invention provides a high-temperature-resistant phosphono-containing concrete retarder and a preparation method thereof. The phosphono-containing concrete retarder has the advantages of high temperature resistance and excellent setting retarding effects, can enhance the adaptability of a polycarboxylic acid water reducing agent to machine-made sand and low-activity admixtures, lowers the sensitivity to cement, temperature and water consumption, and enhances the sulfate and clay tolerance. Under the synergic action of the polycarboxylic acid water reducing agent, the concrete retarder obviously improves the concrete workability, and is suitable for preparing concrete under harsh working conditions, such as low sandstone material quality, high-temperature environment, long-time transportation and the like. The preparation technique is simple, and has high feasibility for industrial production and broad market application space. The concrete retarder has important technical support effects on promoting the market application of the polycarboxylic acid water reducing agent and enhancing the rheological properties, mechanical properties and durability of the concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a high-temperature-resistant phosphonic acid-based concrete retarder and a preparation method thereof. Background technique [0002] Concrete admixture refers to the substance added to improve and adjust the performance of concrete. It can regulate the rheological properties of concrete, improve mechanical properties and improve durability. Concrete admixture technology has become the core technology of modern concrete. Aiming at market application defects such as rapid concrete slump loss and poor adaptability of concrete polycarboxylate superplasticizers in areas where low-quality aggregates are used (manufactured sand), develop high temperature resistant, strong retarding ability, and polycarboxylate water reducing agents. Cement retarder with good adaptability is of great significance. [0003] There have been a large number of literature an...

AI Technical Summary

Problems solved by technology

However, in the field of concrete technology, there is little research on retarders that are resistant to high temperatures and compatible with polycarboxylate superplasticizers, and there are fewer products in the market.

[0009] However, the raw material situation of modern concrete is becoming more and more severe. The use of industrial by-product gypsum as a cement coagulant has resulted in the cementitious material SO 4 2- The content is high; the wide application of fly ash, slag powder, coal gangue and other bulk industrial solid wastes makes the composition of cementitious materials more complicated; especially the high-quality sand and stone resources are increasingly scarce, and the aggregate mud content and water absorption The increase of the water reducing agent directly affects the adaptability between the concrete admixture and the material, resulting in a significant decrease in the initial fluidity and fluidity retention of the concrete, which greatly limits the popularization and application of high-performance water reducers.

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