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以粉煤灰、矿渣粉和硅灰为混合材制备海工硅酸盐水泥,通过掺入不同量的石膏,研究石膏掺量对海工硅酸盐水泥物理性能及耐久性能的影响。试验结果表明,适宜的石膏掺量(7%),具有明显的缓凝作用,可有效激发海工硅酸盐水泥的活性,提高水泥砂浆的早期强度;当石膏掺量超过适宜范围时(>7%),会降低海工水泥的早期、后期强度,进而影响海工硅酸盐水泥的耐久性能。XRD和SEM分析表明,与P·O42.5水泥相比,适宜的石膏掺量(7%)可以提高水泥水化体系中AFt的生成量,使水泥石更加致密,孔隙率小,凝胶体多,使得水泥硬化体具有优异的力学性能和耐久性能。
The marine portland cement was prepared by using fly ash, slag powder and silica fume as the mixed materials. The influence of gypsum content on the physical properties and durability of marine portland cement was studied by mixing different amounts of gypsum. The results show that the appropriate dosage of gypsum (7%) has obvious retarding effect, which can effectively stimulate the activity of marine Portland cement and improve the early strength of cement mortar. When the content of gypsum exceeds the proper range (> 7%), will reduce the early and late strength of marine cement, thereby affecting the durability of marine Portland cement. XRD and SEM analysis showed that the suitable dosage of gypsum (7%) could increase the amount of AFt in the cement hydration system compared with the P · O42.5 cement, making the cement densification more compact with less porosity, More, making hardened cement body has excellent mechanical properties and durability.