脱硫石膏复合胶凝材料及其激发效果研究

采用脱硫石膏为主要原料,制备了脱硫石膏-水泥-粉煤灰复合胶凝材料,考察了激发剂对其改性效果及显微结构特征。结果显示掺52%脱硫石膏,31%水泥,12%粉煤灰,5%激发剂时,复合胶凝材料后期强度较高,其28d强度可达到64.6MPa。14～28d试样抗压强度呈急剧增加趋势,其原因可能是后期水泥水化和粉煤灰二次水化所致。在脱硫石膏-水泥体系中,存在较多物理键和少量化学键,而掺加Al2O24-离子激发水泥和粉煤灰可形成致密凝聚-结晶复合结构。

RESEARCH ON THE EXCITING EFFECT OF DESULFURIZED GYPSUM COMPOUND CEMENTING MATERIAL

The desulfurized gypsum -cementfly ash compound cementing material was prepared 13 semi-hydrate desulfurized gypsum as main raw material, and its modified effect and micro-structural features was studied with activating agent. The results showed that the later period composite strength of compound cementing material is higher, containing with 52% desulfurized gypsum,31% cement, 12% fly ash,5% activator, and its 28d strength can achieve 64.6MPa. At 14 -28d, its compressive strength shows a sharp growth trend,which can be interpreted as the results of cement hydration and fly ash secondary hydration. In the desulfurized gypsum-cement system, there are a lot of physical bonds and smaller amount of chemical bonds. The fly ash, cement and CaS04 . 2 H2 0 will form a dense gels aggregationcrystal compound structure due to containin~ ALO^2/4- ions activator.