风化作用
大孔隙
微观结构
矿物学
地质学
分形
扫描电子显微镜
多孔性
表征(材料科学)
材料科学
介孔材料
复合材料
地球化学
岩土工程
化学
数学分析
生物化学
数学
催化作用
纳米技术
作者
Kang Zhao,Jiale Chen,Jun Wu,Yajing Yan,Qizheng Huang,Qiang Nie,Wenjin Xiao
标识
DOI:10.1144/qjegh2023-075
摘要
Weathering of granite leads to weakening of its crushing and mechanical properties, as well as changes in mineral composition. In order to investigate the correlation between the effects of weathering on granite and the characterization of the pore structure at the micro- and fine-scale, in this paper the pore structure of weathered granite is tested by the NMR technique. The pore distribution characteristics of weathered granite were explored in conjunction with T 2 spectral relaxation time and fractal theory. The microstructure of weathering-prone granite was monitored using scanning electron microscopy equipment. The results show that the pores can be classified into the three categories of small, medium and large pores based on their pore size distribution characteristics. Weathered granite has fractal features in the mesopores and macropores. Compared with unweathered granite, weathered granite has significantly more small pore throats and fewer medium and large pore throats, which expand into microfissures and micropores under conditions of weathering. The microstructure of weathered granite is mainly flaky and shell-like, with good connectivity, resulting in the poor overall structure of weathered granite.
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