Limestone flour mineral composite agent

Abstract

The invention provides a limestone flour mineral composite agent. The limestone flour mineral composite agent is prepared from the following raw materials in parts by weight: 30 to 80 parts of limestone flour, 10 to 30 parts of slag powder, 5 to 10 parts of magnesia powder, 3 to 8 parts of nitrate, 20 to 50 parts of gypsum powder and 5 to 15 parts of triethanolamine. According to the composite agent, the early strength and long-term strength of concrete can be improved, the early hydration of cement is promoted due to the limestone flour, and moreover, the triethanolamine is also beneficial for the development on the early strength of concrete; the durability of concrete is improved, the porosity of concrete can be effectively reduced due to combined addition of the limestone flour and mineral powder, so that the pore structure is refined, the pore structure is improved, the chloride ion diffusion coefficient of concrete can be effectively reduced, and moreover, the triethanolamine enables a cement hydration product to be compact in structure. The composite agent is simple in preparation technology and low in cost, and is applicable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of limestone, and in particular relates to a limestone powder mineral composite material. Background technique [0002] Limestone is a kind of calcite (CaCO 3 ) are composed of minerals, which are rich in natural resources, widely distributed and easy to obtain. As raw materials for cement production and coarse and fine aggregates for concrete, a large amount of limestone powder is inevitably produced in the process of mining limestone and producing machine-made sand and stone. If it is discarded, it will cause huge environmental pollution and increase the environmental load. , occupying land. Therefore, if limestone powder can be used as an admixture to reduce the amount of cement, improve the performance and strength of concrete mixture, and improve the durability of concrete, this will not only make up for the scarcity and shortage of existing admixtures, but also reduce production costs and reduce Was...

AI Technical Summary

Problems solved by technology

Therefore, it is difficult to increase the amount of limestone powder in cement concrete, which limits its wide application and slows the growth of concrete strength in the later stage, which further restricts the application of limestone powder in cement concrete.