Modified silicon-manganese slag, concrete prepared from the same and preparation method for concrete

Abstract

Belonging to the technical field of concrete preparation, the invention provides a modified silicon-manganese slag, concrete prepared from the silicon-manganese slag and a preparation method for the concrete. The modified silicon-manganese slag includes: silicon-manganese slag powder and an organic salt. An organic salt exciting agent is employed to perform chemical excitation on the silicon-manganese slag, thus replacing the chemical excitation on silicon-manganese slag by an inorganic base exciting agent frequently-used in the prior art. During preparation of concrete from the modified silicon-manganese slag, the dosage of the modified silicon-manganese slag can reach 44-80wt% of the total weight of a cementing material, the 3d compressive strength can reach 11.4-33.0MPa, and the 28d compressive strength can reach 27.2-74.3MPa. And the stability of the concrete is good. While the cost of the concrete is reduced, the utilization rate of the silicon-manganese slag powder is also greatly improved, thereby being in favour of reducing the environmental pollution problem brought about by silicon-manganese slag.

Description

technical field [0001] The invention relates to a modified silicomanganese slag, concrete prepared by using the silicomanganese slag and a method for preparing the concrete, belonging to the technical field of concrete. Background technique [0002] Silico-manganese slag is an industrial waste slag formed by water quenching or natural cooling in air when ferroalloy enterprises use manganese ore, manganese-rich slag, lime, coke, silica and other raw materials to smelt silicon-manganese alloys in submerged arc furnaces. Its chemical composition is mainly SiO 2 and CaO, followed by Al 2 o 3 , MnO. According to the statistics and reports of relevant enterprises, 1.2~1.3 tons of silicomanganese slag will be produced for every 1 ton of silicomanganese alloy produced. In the past 10 years, about 3 million tons of silicomanganese slag have been produced every year, and most of the silicomanganese slag discharged by ferroalloy enterprises has not been Any treatment is directly di...

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Problems solved by technology

[0006] What the present invention is to solve is that in the prior art, when the silicomanganese slag excited by inorganic alkali is used in concrete, in order to ensure the later strength of the concrete, the content of the silicomanganese slag cannot exceed 30wt% of the total amount of cementitious materials, resulting in silicon The utilization rate of manganese slag is low, which is not conducive to solving the accumulation and environmental pollution problems caused by the large discharge of silicomanganese slag, and then provides a modified silicomanganese slag, which can reach 44~80wt% when used in the preparation of concrete. And the prepared concrete has the advantages of high strength and good stability in the later stage

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