通过加速碳化激发γ-C_2S矿物的活性  

Activation of γ-C_2S Mineral by Accelerated Carbonation

作　　者：刘松辉 管学茂[1] 邱满[1] 冯春花[1] 

机构地区：[1]河南理工大学材料科学与工程学院,河南焦作454003

出　　处：《硅酸盐学报》2016年第5期658-662,共5页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金(51272068)资助项目

摘　　要：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-Ca2SiO4（γ-C2S） phase was prepared at 1 350 ℃, and the mechanical properties of γ-C2S after accelerated carbonation was examined. The hardening mechanism was analyzed by X-ray diffraction, high resolution 29Si magic angle spinning nuclear magnetic resonance and scanning electron microscopy, respectively, to explore the feasibility of using accelerated carbonation to activate γ-C2S. The results indicate that the accelerated carbonation activates γ-C2S significantly. The compressive strength reaches 71.3 MPa after 8 h carbonation. During the carbonation process, amorphous calcium carbonate and highly polymerized silica gel are formed, which are similar to the hydrated calcium silicate （C-S-H） gel in harden Portland cement paste and are responsible for the strength development.

关 键 词：硅酸二钙 碳化 力学性能 二氧化碳 封存 

分 类 号：TU526[建筑科学—建筑技术科学]