Expansive agent for concrete and preparation method of expansive agent

Abstract

The invention discloses an expansive agent for concrete and a preparation method of the expansive agent, and belongs to the field of expansive agent for concrete. The method comprises the steps: taking high-iron waste residues, a calcium source, an aluminum source and gypsum as raw materials, adding a mineralizer and an auxiliary fuel, uniformly mixing, adding water, and carrying out ball milling;and drying slurry, putting the dried slurry into a resistor, roasting, uniformly mixing, calcining in a high-temperature furnace to obtain concrete expansion clinker with anhydrous calcium sulfoaluminate and dicalcium aluminoferrite as main components, and mixing the concrete expansion clinker with a proper amount of gypsum to obtain the sulfoaluminoferrite expansive agent. The method is low in production cost, and the prepared expansive agent for concrete has good restrained expansion rate, high compressive and flexural strength and good comprehensive performance, and meets the performance requirements of the national standard GB/T23439-2017 'Expansive Agent for Concrete'.

Description

technical field [0001] The invention relates to a concrete expansion agent, in particular to preparing the concrete expansion agent by using high-speed iron waste slag as a raw material. Background technique [0002] Concrete expansion agent refers to the admixture that can cause the concrete to produce a certain volume expansion due to chemical action during the hardening process after being mixed into the concrete. According to the chemical composition, it can be divided into: calcium oxide, calcium sulfoaluminate, calcium sulfoaluminate- Calcium oxide, magnesium oxide, iron oxide. In recent years, with the accumulation of industrial solid waste and the potential threats brought by the solid waste itself, the resource utilization of industrial solid waste has become a current research hotspot. In the research of concrete expansion agent, the use of industrial waste to prepare concrete expansion agent has become the future trend of the development of the concrete expansion...

AI Technical Summary

Problems solved by technology

[0005] So far, a large number of documents have shown that electrolytic manganese slag is mainly used in the preparation of cement admixtures, retarders, cementitious materials and porous ceramics. Most of the resource utilization technologies of electrolytic manganese slag are in the laboratory stage or theoretical stage, and there are very few in actual industrial production.

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