水玻璃激发下HBSS-PG-AC复合胶凝材料水化性能分析

摘要/Abstract

摘要： 以磷石膏(PG)、热焖钢渣(HBSS)、硅酸盐水泥和铝酸盐水泥(AC)为主原料,水玻璃为碱激发剂制备复合胶凝材料。在养护龄期0~28 d内,测试了该材料的抗压强度与膨胀率,并通过X射线衍射(XRD)、扫描电子显微镜(SEM)和比表面积及孔隙率(BET)测试,分析了磷石膏、热焖钢渣和铝酸盐水泥间的水化协同机理。结果表明,过0.300 mm筛孔的钢渣微粉同时具备良好的骨架填充作用和水化胶凝性能。水化过程中水玻璃可提高钢渣表面玻璃体网络结构的溶解速率,促使钢渣与铝酸盐水泥生成C-A-S-H。同时,铝酸盐水泥与磷石膏反应生成的钙矾石可抑制C-A-H水化过程中的相变收缩。此外,若铝酸盐水泥比例过高,大量钙矾石和C-A-H会迅速生成并覆盖于钢渣表面,阻碍Na₂SiO₃促进钢渣玻璃网络结构的溶解。本文可为磷石膏和钢渣协同资源化利用提供理论依据。

关键词: 热焖钢渣, 磷石膏, 铝酸盐水泥, 水玻璃, 胶凝性能, 相变收缩

Abstract: Composite cementitious materials were prepared by using phosphogypsum (PG), hot-braised steel slag (HBSS), Portland cement and aluminate cement (CA) as main raw materials, and sodium silicate as alkali activator. In the curing age from 0 d to 28 d, the compressive strength and expansion rate of materials were tested in the experiments. Meanwhile, the synergic mechanisms of hydration synergism among phosphogypsum, hot-braised steel slag and aluminate cement were analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM) and specific surface area and porosity (BET) measurement. The results show that the steel slag powder through 0.300 mm sieve-aperture has both good skeleton filling and gelling properties. In the hydration process, sodium silicate increases the dissolving rate of vitreous network structure on the surface of steel slag and promotes the formation of C-A-S-H from steel slag and aluminate cement. Furthermore, the phase-transforming shrinkage of C-A-H is inhibited by the ettringite formed with the reaction of aluminate cement and phosphogypsum. In addition, a wealth of ettringite and C-A-H is rapidly generated and covered on the surface of steel slag with excessive addition of aluminate cement, which hinders the dissolution promoting effect of Na₂SiO₃ on the glass network structure of steel slag. This paper provides theoretical basis for the collaborative utilization of phosphogypsum and steel slag.

Key words: hot-braised steel slag, phosphogypsum, aluminate cement, sodium silicate, gelling property, phase-transforming shrinkage

中图分类号:

X705

卿三成, 马丽萍, 杨静, 敖冉, 殷霞, 穆刘森. 水玻璃激发下HBSS-PG-AC复合胶凝材料水化性能分析[J]. 硅酸盐通报, 2021, 40(12): 4052-4060.

QING Sancheng, MA Liping, YANG Jing, AO Ran, YIN Xia, MU Liusen. Analysis of Hydration Properties of HBSS-PG-AC Composite Cementitious Materials Excited by Sodium Silicate[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(12): 4052-4060.

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