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A platform for research: civil engineering, architecture and urbanism
Influence of bimodal structure on the soil freezing characteristic curve in expansive soils
Abstract The bimodal structure in expansive soils that refers to the bimodality of the pore size distribution significantly affects the soil freezing characteristic curve (SFCC). In this paper, the artificial samples with different bimodal structures are prepared by mixing Qinghai-Tibet silty clay and bentonite in different proportions. The influence of the bimodal structure on the SFCC of the samples was studied by the mercury intrusion porosimetry test, the nuclear magnetic resonance (NMR) test and the freezing-point test. The results show that the freezing stage of the SFCC in bimodal soils consists of a rapid-drop part related to freezing of macropore water and a slow-drop part related to freezing of micropore water. As the specific surface area increases, the proportion of the rapid-drop part decreases whereas the slow-drop part increases. On the temperature-time curve, the duration of the isothermal stage and the freezing point decrease with the rising specific surface area. Based on the experimental results, we established a novel SFCC function derived from the theory of pore size distribution by extending the lognormal distribution to consider bimodality. The SFCC function can fit the measured data of the SFCC well.
Highlights The influence of the bimodal structure on SFCC is experimentally investigated. The freezing stage of SFCC comprises a rapid-drop part and a slow-drop part. The freezing point decreases with rising amounts of micropores. A new SFCC function with bimodality is proposed.
Influence of bimodal structure on the soil freezing characteristic curve in expansive soils
Abstract The bimodal structure in expansive soils that refers to the bimodality of the pore size distribution significantly affects the soil freezing characteristic curve (SFCC). In this paper, the artificial samples with different bimodal structures are prepared by mixing Qinghai-Tibet silty clay and bentonite in different proportions. The influence of the bimodal structure on the SFCC of the samples was studied by the mercury intrusion porosimetry test, the nuclear magnetic resonance (NMR) test and the freezing-point test. The results show that the freezing stage of the SFCC in bimodal soils consists of a rapid-drop part related to freezing of macropore water and a slow-drop part related to freezing of micropore water. As the specific surface area increases, the proportion of the rapid-drop part decreases whereas the slow-drop part increases. On the temperature-time curve, the duration of the isothermal stage and the freezing point decrease with the rising specific surface area. Based on the experimental results, we established a novel SFCC function derived from the theory of pore size distribution by extending the lognormal distribution to consider bimodality. The SFCC function can fit the measured data of the SFCC well.
Highlights The influence of the bimodal structure on SFCC is experimentally investigated. The freezing stage of SFCC comprises a rapid-drop part and a slow-drop part. The freezing point decreases with rising amounts of micropores. A new SFCC function with bimodality is proposed.
Influence of bimodal structure on the soil freezing characteristic curve in expansive soils
Kong, Lingming (author) / Yu, Aolin (author) / Liang, Ke (author) / Qi, Jilin (author)
2021-11-12
Article (Journal)
Electronic Resource
English
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