摘要
充分利用硬石膏胶凝性,开发硬石膏胶结材是对硬石膏资源最合理、有效的利用。本文通过对硬石膏水化率与水化温升测定、比表面积与水化活性关系、硬化体相组成与显微结构分析,重点研究了硫酸盐激发、矿渣改性、粉磨活化对硬石膏胶结材料的影响。结果表明:硫酸盐可以缩短硬石膏凝结时间,提高硬石膏水化率,使硬石膏水化热集中,水化温升增大,硬石膏水化进程加快;矿渣可以促进硬石膏水化,形成钙矾石、水化硅酸钙等水硬性矿物,提高硬石膏胶结材的强度与耐水性;硬石膏溶解水化活性随其分散度增加而提高。采用硫酸盐激发、矿渣改性和粉磨活化可以配制28d抗压强度32.5MPa、软化系数0.78的硬石膏胶结材。
Developing anhydrite-based bonding materials by full use of its potential cementation is the most rational and effective way of utilizing anhydrite resources. In this paper, natural anhydrite was activated by addition of sulfate salt, modification with slag and grinding. Its activating effect was assensed by the determination of hydration rate and hydration temperature-rises, study on the relationship between specific surface area and hydration activity, in combination with the analysis of the phase composition and microstructure of hardened paste. The results show, the addition of sulfate salt shortens the setting time of anhydrite, increases its hydration rate concentrates its hydration heat, increases its hydration temperaturerises, and thus accelerates its hydration process. The blendment of slag promotes the hydration of anhydrite, and some hydraulic cementing minerals such as ettringite and hydrated calcium silicate are formed by chemical reaction with anhydrite, as a result, the strength and water-resistance of anhydrite binder are increasd. The dissolution and hydration activity of anhydrite is increased with the increase of its dispersion. By activation by sulfate salt, modification with slag and aid-grinding, an anhydrite binder is prepared with a compressive strength of 32.5 MPa at 28 d hydration period and a softening coefficient of 0.78.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2008年第4期837-842,共6页
Bulletin of the Chinese Ceramic Society
基金
国家自然科学基金资助项目(50572126)
