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在1 350℃的煅烧温度下,制备了纯的γ-Ca_2SiO_4(γ-C_2S)矿物,研究了加速碳化后该矿物的物理力学性能。结合X射线衍射、高分辨29Si固体核磁共振和扫描电子显微镜分析其硬化机理,探讨了加速碳化技术激发γ-C_2S矿物活性的可行性。结果表明:加速碳化能显著激发γ-C_2S矿物的活性,8 h抗压强度达71.3 MPa;γ-C_2S碳化形成了形状不规则的碳酸钙和高度聚合的硅凝胶,类似于水化硅酸钙(C-S-H)凝胶的作用,是强度增加的主要来源。
The pure γ-Ca 2 SiO 4 (γ-C 2 S) mineral was prepared at a calcination temperature of 1 350 ℃, and the physical and mechanical properties of the mineral after accelerated carbonation were studied. Combined with X-ray diffraction, high-resolution 29Si solid-state nuclear magnetic resonance and scanning electron microscopy, the mechanism of γ-C 2 S mineralization was discussed. The results show that accelerated carbonization can significantly stimulate the activity of γ-C 2 S mineral, and the compressive strength reaches 71.3 MPa at 8 h. Carbonized γ-C 2 S forms irregularly shaped calcium carbonate and highly polymerized silica gel, similar to hydrated silicic acid The effect of calcium (CSH) gels is a major source of increased strength.