海水拌养对铝酸盐水泥强度及水化性能的影响

Effect of seawater for mixing and curing on strength and hydration of calcium aluminate cement

本文主要研究了拌合水对铝酸盐水泥的强度和水化性能的影响,通过X射线衍射、压汞法测孔及扫描电子显微镜等测试手段,对水泥的水化产物组成、微观形貌和孔结构进行分析。结果表明:与淡水拌养相比,海水拌养主要影响其早期的水化性能,对后期的强度及水化微结构影响甚微。20℃养护温度下,海水拌养加速了铝酸盐水泥3d的水化进程,其3d水化产物试样致密程度较高,因而早期抗压强度稍高。50℃养护温度下,海水拌养可延缓CA和CA2的3d水化反应进程,降低了CAH10向C3AH6的转变程度,试样中毛细孔分布向低孔径方向移动,因而试样密度较高,3d抗压强度明显提升。

Effect of seawater for mixing and curing on the strength and hydration of calcium aluminate cement(CAC) at different curing temperatures was studied. X-ray diffraction, scanning electron microscopy, mercury intrusion porosimetry and the compressive strength were conducted on the CAC. Compared with fresh water, seawater for mixing and curing mainly affected significantly early hydration performance of CAC, and has little effect on later strength and hydration microstructure. When cured at 20℃, the hydration process of CAC for 3 d was accelerated by sea water for mixing and curing, and the density of samples was higher, so the early compressive strength was slightly higher. While cured at 50℃, seawater for mixing and curing can retard CAC hydration of 3 d, the phase conversion from CAH10 to C3AH6 can be reduced, the distribution of capillary pores in the sample can be shifted to lower diameters, as a result, the sample has higher density and higher compressive strength.