Super-active slag powder and production method thereof

Abstract

The invention relates to a super-active slag powder and a production method thereof, belonging to the technical field of new materials. The invention has the technical scheme as follows: the super-active slag powder comprises the following components based on portions by weight: 30-35 portions of SiO2, 35-38 portions of CaO, 13-18 portions of Al2O3, 0.5-0.9 portion of Fe2O3 and 7-11 portions of MgO and has the specific surface area of 800-2000m<2> / kg and the grain size of 2-5 microns. The invention also provides the preparation method of the super-active slag powder. The super-active slag powder increases the reaction speed of cement and greatly improves the early strength of cement and concrete, thereby being used as an ultra-fine high-activity concrete admixture in the field of building materials and applied to fields, such as rubber and plastic filled modification, oilfield cementing, wear-resisting floors, and the like. The preparation method of the super-active slag powder is novel and has low cost.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a superactive slag powder and a production method thereof. Background technique [0002] As a concrete admixture, slag powder can not only save the amount of cement and reduce the cost of concrete (about 10 to 20 yuan per square meter), but also improve the submicrostructure in concrete and increase the interface strength between coarse aggregate and mortar , fill the capillary inside the concrete, increase the later strength of the concrete, and fully improve the performance of the concrete. In today's rapidly developing society, slag powder has been recognized by people from all walks of life as a concrete admixture. [0003] One of the basic requirements for the application of slag powder is that it must have a large enough fineness. The specific surface area of ​​S95 grade slag powder is generally 430m 2 / kg, there are many particles smaller than 30μm, and...

AI Technical Summary

Problems solved by technology

[0003] One of the basic requirements for the application of slag powder is that it must have a large enough fineness. The specific surface area of ​​S95 grade slag powder is generally 430m 2 / kg, there are many particles smaller than 30μm, and it can fill projects with larger cracks, and the 7d activity index of S95 grade slag powder is about 80%, and the 28d activity index is generally about 102%, which has a good effect on the later strength of concrete. effect, but has no obvious effect on the early strength of concrete

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