Energy-saving cement and preparation method therefor

Abstract

The invention discloses energy-saving cement and a preparation method therefor. The cement comprises the ingredients in parts by weight: 73-86 parts of silicate cement clinker, 2-8 parts of gypsum, 1-5 parts of limestone, 5-10 parts of mineral powder, 1-5 parts of sodium hydroxide and 15-20 parts of steel slag powder, wherein the steel slag powder is obtained through subjecting a steel slag raw material to pulverizing treatment, and a pulverizing assisting combined additive, which accounts for 1% to 2.5% the weight of the steel slag raw material, is added during pulverizing treatment; and thepulverizing assisting combined additive comprises fly ash and colloidal graphite powder which are in a mass ratio of 1: (0.3 to 1.5). The energy-saving cement may also comprise 10-15 parts of modifiedhollow glass beads, wherein the modified hollow glass beads are obtained through treating hollow glass beads with a silane coupler. The preparation method for the cement comprises the steps: preparing the steel slag powder; preparing the modified hollow glass beads; and mixing raw material ingredients of the cement, and then, carrying out cement pulverizing, thereby preparing the energy-saving cement. According to the energy-saving cement and the preparation method therefor, a large volume of steel slag powder is adopted, the waste utilization of the steel slag is achieved, and the blended concrete mixture has the characteristic of high compressive strength.

Description

technical field [0001] The invention relates to the technical field of concrete building materials, in particular to an energy-saving cement and a preparation method thereof. Background technique [0002] Steel slag is a waste slag discharged during the steelmaking process. At present, the annual discharge of steel slag in my country can reach hundreds of millions of tons, but the utilization rate of steel slag is less than 17%, resulting in a large accumulation of steel slag. The accumulated steel slag not only takes up a lot of land resources, but also causes serious environmental pollution. [0003] The composition of steel slag mainly includes the furnace lining material eroded during the steelmaking process, oxides formed by molten iron and metal elements contained in scrap steel, sediment, slagging agents, coolants, oxidants, deoxidation products, desulfurization products, etc. Steel slag has excellent properties such as high compressive strength, high hardness, good...

AI Technical Summary

Problems solved by technology

At present, the annual discharge of steel slag in my country can reach hundreds of millions of tons, but the utilization rate of steel slag is less than 17%, resulting in a large amount of steel slag accumulation

[0004] However, adding steel slag to energy-saving cement, in the concrete mixture prepared by using this energy-saving cement, the bonding performance between the steel slag and the concrete mixture matrix is ​​poor, which is not conducive to obtaining a concrete mixture with high compressive strength. Seriously restricted the application of steel slag in energy-saving cement

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