Composite modified high titanium slag micropowder used for concrete and concrete preparation method

Abstract

The invention discloses composite modified high titanium slag micropowder used for concrete, and the composite modified high titanium slag micropowder is characterized by being prepared by mixing 50%-67% by weight of high titanium slag, 31%-50% by weight of circulating fluidized bed fire coal ash and 0%-8% by weight of metakaolin. The concrete is prepared by mixing the composite modified high titanium slag micropowder with cement, sand, stone, water and a water reducing agent by stirring, molding and curing. The composite modified high titanium slag micropowder can use a large amount of the industrial solid waste high titanium slag and the circulating fluidized bed fire coal ash; the concrete performance is better than that of single doped S75 grade granulated blast furnace slag powder concrete. By adopting the composite modified high titanium slag micropowder, industrial solid waste is extensively used, the preparation method is simple, cost is low, the composite modified high titanium slag micropowder is especially suitable for regions in which a large number of high titanium slag and circulating fluidized bed fire coal ash are simultaneously discharged, and has obvious economic benefits, broad market prospects and strong practicability.

Description

technical field [0001] The invention belongs to the treatment of solid waste and the application of solid waste in concrete, and relates to a composite modified high-titanium slag micropowder used in concrete and a preparation method for concrete. Background technique [0002] When the blast furnace smelts pig iron, it will produce a melt with silicate and aluminosilicate as the main components, which will be granulated blast furnace slag after quenching and granulation. After the granulated blast furnace slag is dried, it is ground to a specific surface area ≥ 350m 2 / kg, 7d activity index ≥ 55%, 28d activity index ≥ 75%, fluidity ratio ≥ 95% and other indicators, that is, S75 grade slag powder (specifically refer to GB / T 18046-2008 "Granular Slag Used in Cement and Concrete" blast furnace slag powder"). S75 grade slag powder has high activity and high fluidity ratio, which can replace cement clinker or cement in a large amount for cement admixture or concrete mineral adm...

AI Technical Summary

Problems solved by technology

Due to TiO 2 High content, high titanium slag has poor grindability and low activity (the activity index is generally below 65%, even if it is ground to a specific surface area ≥ 400m 2 / kg, it is also difficult to meet the requirements of S75 grade slag powder), when applied to cement concrete, the strength of cement concrete will be significantly reduced after the dosage reaches 10% and above.

At present, high-titanium slag has not been effectively utilized in large quantities in building materials. Its stockpiles have reached more than 200 million tons, and the annual discharge continues to grow by 20 million tons. Serious damage to the local ecological environment

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