材料科学
胶凝的
化学工程
氢氧化钙
水泥
结晶
火山灰反应
波特兰岩
火山灰
矿物学
复合材料
硅酸盐水泥
化学
工程类
作者
Tingcong Wei,Fengqi Wei,Ji Zhou,Zhiqiang Wu,Chunmei Zhang,Jia Zhuang,Xiaowei Cheng
标识
DOI:10.1016/j.cemconres.2022.106812
摘要
As oil and gas exploration advances into more complex underground formations, oil-well cement, used to support bore casings, is at risk of mechanical failure. To clarify the strengthening mechanisms of silica powder, the hydration characteristics of C3S-silica and C2S-silica powder systems were studied at high temperature (230 °C) and pressure (20.7 MPa). The results show that microstructural coarsening is the primary reason for the poor mechanical properties of the cementitious materials. The formation of xonotlite included two sources: the crystallisation reaction of silica powder with C-S-H and the pozzolanic reaction of silica powder with calcium hydroxide. The CaO layer in C-S-H and calcium hydroxide provided a ‘Ca’ source for the formation of xonotlite. Q2 and Q3 Si units with a high polymerisation degree improve the high-temperature stability of xonotlite, while the dense structure formed by xonotlite improves the mechanical properties. For designing high-performance high-temperature resistant cement-based materials, xonotlite should preferably be generated by selecting crystalline silica powder.
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