Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil
A proper treatment of granite residual soil (GRS) in geotechnical practices requires both macro and microscopic evaluations. In this study, uniaxial and oedometric compression tests were conducted to investigate the mechanical properties of the saturated untreated and cement-treated GRS. Meanwhile,...
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MDPI AG
2022-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/24/12549 |
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| author | Xinxin Dong Xiaohua Bao Hongzhi Cui Changjie Xu Xiangsheng Chen |
| author_facet | Xinxin Dong Xiaohua Bao Hongzhi Cui Changjie Xu Xiangsheng Chen |
| author_sort | Xinxin Dong |
| collection | DOAJ |
| description | A proper treatment of granite residual soil (GRS) in geotechnical practices requires both macro and microscopic evaluations. In this study, uniaxial and oedometric compression tests were conducted to investigate the mechanical properties of the saturated untreated and cement-treated GRS. Meanwhile, XRD, SEM, and MIP tests were conducted to identify the presence and types of C–S–H and the changes in the pore structure after cement treatment. The effects of cement treatment on the uniaxial compressive strength, secant modulus, compressibility, and vertical yielding pressure were revealed and the mechanisms of the soil structure to be modified through cement treatment were clarified based on the test results. A threshold volumetric cement content of 2–3% was determined based on the mechanical properties and microstructural characteristics of the saturated cement-treated GRS. Cement contents below this threshold would produce inadequate cementation between the soil particles. In contrast, cement contents above this threshold are considered inefficient because the transformation of the soil structure from single-porosity to dual-porosity increases the total porosity and retards the strength and stiffness gains. |
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| language | English |
| last_indexed | 2024-03-09T17:23:23Z |
| publishDate | 2022-12-01 |
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| spelling | doaj.art-c98e52cc136a49dfab761ac8989b39ff2023-11-24T13:00:32ZengMDPI AGApplied Sciences2076-34172022-12-0112241254910.3390/app122412549Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual SoilXinxin Dong0Xiaohua Bao1Hongzhi Cui2Changjie Xu3Xiangsheng Chen4MOE Key Laboratory for Resilient Infrastructures of Coastal Cities, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaMOE Key Laboratory for Resilient Infrastructures of Coastal Cities, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaMOE Key Laboratory for Resilient Infrastructures of Coastal Cities, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaSchool of Civil Engineering and Architecture, East China Jiao Tong University, Nanchang 330013, ChinaMOE Key Laboratory for Resilient Infrastructures of Coastal Cities, College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, ChinaA proper treatment of granite residual soil (GRS) in geotechnical practices requires both macro and microscopic evaluations. In this study, uniaxial and oedometric compression tests were conducted to investigate the mechanical properties of the saturated untreated and cement-treated GRS. Meanwhile, XRD, SEM, and MIP tests were conducted to identify the presence and types of C–S–H and the changes in the pore structure after cement treatment. The effects of cement treatment on the uniaxial compressive strength, secant modulus, compressibility, and vertical yielding pressure were revealed and the mechanisms of the soil structure to be modified through cement treatment were clarified based on the test results. A threshold volumetric cement content of 2–3% was determined based on the mechanical properties and microstructural characteristics of the saturated cement-treated GRS. Cement contents below this threshold would produce inadequate cementation between the soil particles. In contrast, cement contents above this threshold are considered inefficient because the transformation of the soil structure from single-porosity to dual-porosity increases the total porosity and retards the strength and stiffness gains.https://www.mdpi.com/2076-3417/12/24/12549granite residual soilcement treatmentmechanical propertymicrostructure |
| spellingShingle | Xinxin Dong Xiaohua Bao Hongzhi Cui Changjie Xu Xiangsheng Chen Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil Applied Sciences granite residual soil cement treatment mechanical property microstructure |
| title | Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil |
| title_full | Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil |
| title_fullStr | Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil |
| title_full_unstemmed | Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil |
| title_short | Effects of Cement Treatment on Mechanical Properties and Microstructure of a Granite Residual Soil |
| title_sort | effects of cement treatment on mechanical properties and microstructure of a granite residual soil |
| topic | granite residual soil cement treatment mechanical property microstructure |
| url | https://www.mdpi.com/2076-3417/12/24/12549 |
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