High-magnesium waste rock powder-based composite mineral admixture and its application in high-strength concrete

Abstract

The invention discloses a waste high-magnesium rock flour-based composite mineral admixture and application of the same in high-strength concrete. A preparation method for the admixture comprises the following steps: (1) drying waste high-magnesium rock, wet discharged fly ash and manganese slag until water content is lower than 1.0%; and (2) separately grinding 70 to 85 parts by weight of the dried waste high-magnesium rock, 10 to 20 parts by weight of the dried wet discharged fly ash, 0 to 10 parts by weight of the dried manganese slag, 0 to 10 parts by weight of mineral waste residue and 0 to 10 parts by weight of clinker, and then carrying out mixing or carrying out mixing and then grinding until the specific surface area of the obtained mixture is 901 to 1200 m2 / kg so as to obtain the waste high-magnesium rock flour-based composite mineral admixture. According to the invention, the morphological effect and filling effect of the waste high-magnesium rock flour are utilized to improve compactness of a concrete mixture and fluidity of concrete; slump loss is small, and adsorption of additives like polycarboxylic acid is low; and early strength of the concrete develops fast, and later strength of the concrete develops steadily. Moreover, both the admixture provided by the invention and coarse and fine waste high-magnesium rock aggregate can be applied in the concrete, so the utilization rate of the waste high-magnesium rock is substantially increased.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a high-magnesium waste rock powder-based composite mineral admixture and its application in high-strength concrete. Background technique [0002] With the continuous development of the cement and concrete industry, a large amount of high-quality limestone resources are constantly being consumed, and the waste minerals in limestone mines are also increasing year by year. These wastes are piled up on the surface for a long time, which not only takes up a lot of land resources, but also has potential impact on the environment. Hazards, such as causing soil and water environment pollution, destroying vegetation, etc. Therefore, how to deal with limestone mine wastes, thereby saving stockpiled land and reducing environmental pressure, is an important issue to be solved urgently by the cement industry. [0003] As we all know, when mining limestone mines, high-quality lim...

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Problems solved by technology

[0010] (4) Wet fly ash is mixed with water and bottom ash, resulting in low activity, high impurity content, and poor homogeneity, which limits the popularization and application of wet fly ash, and may also have potential Hazardous

At present, a large amount of untreated manganese slag is directly accumulated for a long time, which will cause serious pollution to the surrounding environment.

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