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Macro-porosity and skeleton of a cement-gravel-treated granite residual soil for subgrade from CT scanning
Highlights A brief method for determining macro-porosity of soils from CT scanning is proposed. A criterion for judging presence of global coarse skeleton is proposed based on CT analysis. The threshold cement and gravel contents for treating granite residual soil is suggested.
Abstract Granite residual soil can be utilized as subgrade or embankment fillings after proper treatment. In this study, X-ray CT scanning was employed to investigate the effects of cement and cement-gravel treatment on the macro-porosity and skeleton of a granite residual soil. Firstly, the material phases are preliminarily segmented based on the distribution of the grayscale intensity and its physical significance. Then, a brief method for determining the macro-porosity from CT scanning is proposed. For the cement-treated granite residual soil, the macro-porosity determined from CT scanning fits well with that from MIP analysis and it reached the lowest value at a volumetric cement content of about 2%. In addition, a criterion for judging the presence of local and global soil skeleton is proposed based on contact analysis of the coarse-grains. For the cement-gravel-treated granite residual soil, a global gravel skeleton formed when the volumetric gravel content is beyond 30%. These threshold cement and gravel contents from CT analysis would be helpful for the proper treatment of granite residual soil and utilization of the treated soil as filling materials.
Macro-porosity and skeleton of a cement-gravel-treated granite residual soil for subgrade from CT scanning
Highlights A brief method for determining macro-porosity of soils from CT scanning is proposed. A criterion for judging presence of global coarse skeleton is proposed based on CT analysis. The threshold cement and gravel contents for treating granite residual soil is suggested.
Abstract Granite residual soil can be utilized as subgrade or embankment fillings after proper treatment. In this study, X-ray CT scanning was employed to investigate the effects of cement and cement-gravel treatment on the macro-porosity and skeleton of a granite residual soil. Firstly, the material phases are preliminarily segmented based on the distribution of the grayscale intensity and its physical significance. Then, a brief method for determining the macro-porosity from CT scanning is proposed. For the cement-treated granite residual soil, the macro-porosity determined from CT scanning fits well with that from MIP analysis and it reached the lowest value at a volumetric cement content of about 2%. In addition, a criterion for judging the presence of local and global soil skeleton is proposed based on contact analysis of the coarse-grains. For the cement-gravel-treated granite residual soil, a global gravel skeleton formed when the volumetric gravel content is beyond 30%. These threshold cement and gravel contents from CT analysis would be helpful for the proper treatment of granite residual soil and utilization of the treated soil as filling materials.
Macro-porosity and skeleton of a cement-gravel-treated granite residual soil for subgrade from CT scanning
Dong, Xinxin (author) / Bao, Xiaohua (author) / Cui, Hongzhi (author) / Xu, Changjie (author) / Chen, Xiangsheng (author)
2023-02-09
Article (Journal)
Electronic Resource
English
European Patent Office | 2015
|Continuous Compaction Control Technology for Granite Residual Subgrade Compaction
British Library Online Contents | 2018
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