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通过试验和数值分析确定70%矿渣掺量的基准配合比。研究了蒸汽养护下矿渣粉掺量为70%的胶凝体系的强度,并采用差热-热重分析(TG-DTA)和扫描电镜微观测试技术(SEM),研究了蒸养大掺量矿渣粉-水泥基胶凝材料的水化特性。结果表明:即使矿渣粉在掺量为70%时,与标准养护条件相比,40℃蒸养条件下依然可以促进3~28 d龄期抗压强度大幅度增长;矿渣大量掺入时,氢氧化钙、钙矾石的数量明显减少,但在蒸养硅酸盐水泥(PC)和矿渣水泥(SC)各自的胶凝体系内,3~28 d氢氧化钙的含量均逐渐增多,且浆体结构更加致密。这有利于硬化浆体的强度和耐久性能。
Through the test and numerical analysis to determine the reference mix of 70% slag content. The strength of cementitious system with 70% slag powder content under steam curing was studied. The effects of steam curing on the strength of cementitious system were studied by differential thermal analysis (TG-DTA) and scanning electron microscopy (SEM) Hydration characteristics of powder cementitious materials. The results show that the compressive strength of 3 ~ 28 d age can still be greatly increased under steam curing at 40 ℃ compared with the standard curing conditions even when the content of slag powder is 70% The amount of calcium oxide and ettringite decreased obviously. However, the content of calcium hydroxide in 3 ~ 28 d gradually increased in the respective cementitious system of steamed cement (PC) and slag cement (SC) Body structure is more dense. This facilitates the strength and durability of the hardened paste.