Strength and microstructure of calcareous sand-cemented soil under seawater erosion environment

WAN Zhi-hui; DAI Guo-liang; GONG Wei-ming; ZHU Ming-xing; GAO Lu-chao

doi:10.11779/CJGE2020S1013

Volume 42 Issue S1

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Chinese Journal of Geotechnical Engineering > 2020 > 42(S1): 65-69. > DOI: 10.11779/CJGE2020S1013

WAN Zhi-hui, DAI Guo-liang, GONG Wei-ming, ZHU Ming-xing, GAO Lu-chao. Strength and microstructure of calcareous sand-cemented soil under seawater erosion environment[J]. Chinese Journal of Geotechnical Engineering, 2020, 42(S1): 65-69. DOI: 10.11779/CJGE2020S1013

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Strength and microstructure of calcareous sand-cemented soil under seawater erosion environment

WAN Zhi-hui^{1, 2,},
DAI Guo-liang^{1, 2},
GONG Wei-ming^{1, 2},
ZHU Ming-xing^{1, 2},
GAO Lu-chao^{1, 2}

1.
Key Laboratory of Concrete and Prestressed Concrete Structures of Ministry of Education, Nanjing 211189, China
2.
School of Civil Engineering, Southeast University, Nanjing 211189, China

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Received Date: June 03, 2020
Available Online: December 07, 2022

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Abstract

Aiming at the durability and long-term stability problems of calcareous sand-cemented soil composite foundation in the marine environment, the seawater is used as the corrosive medium to perform an indoor soaking test on the calcareous sand cemented soil, and the micro cone penetration, scanning electron microscopy, energy dispersive spectrometer, and X-ray diffraction tests are conducted to analyze the strength and microstructure characteristics of calcareous sand cemented soil with different curing time and cement ratios under seawater environment. The results show that the erosion depth of calcareous sand-cemented soil gradually increases with the increase of curing time and gradually decreases with the increase of cement ratio, and the increase of cement ratio can effectively inhibit the erosion depth of cemented soil caused by seawater corrosive ions. Compared with those of the non-eroded layer, the porosities of microstructure are lager and the Ca contents are less in the eroded layer, and the Ca content and the strength of cemented soil show a similar rule. Under seawater environmental conditions, the strength change of cemented soil is the common result of the effects of growth and erosion. In this process, the cemented soil is prone to the phenomenon of Ca dissolution, which finally leads to the strength reduction of cemented soil.
- calcareous sand,
- cemented soil,
- seawater erosion environment,
- micro cone penetration test,
- microstructure

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[1]	COOP M R. The mechanics of uncemented carbonate sands[J]. Géotechnique, 1990, 40(4): 607-626. doi: 10.1680/geot.1990.40.4.607
[2]	GHAZALI F M, SOTIROPOULOS E, MANSOUR O A. Large-diameter bored and grouted piles in marine sediments of the Red Sea[J]. Canadian Geotechnical Journal, 1988, 25(4): 826-831. doi: 10.1139/t88-090
[3]	房靖超, 陈涛, 何岩东, 等. 珊瑚砂层注浆的固化技术研究[J]. 海南大学学报(自然科学版), 2016, 34(3): 264-269. https://www.cnki.com.cn/Article/CJFDTOTAL-HNDK201603011.htm FANG Jing-chao, CHEN Tao, HE Yan-dong, et al. Solidification technology of coral sand[J]. Natural Science Journal of Hainan University, 2016, 34(3): 264-269. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-HNDK201603011.htm
[4]	HARA H, HAYASHI S, SUETSUGU D, et al. Study on the property changes of lime-treated soil under sea water[J]. Doboku Gakkai Ronbunshuu C/JSCE Journal of Geotechnical and Geoenvironmental Engineering, 2010, 66(1): 21-30.
[5]	刘泉声, 屈家旺, 柳志平, 等. 侵蚀影响下水泥土的力学性质试验研究[J]. 岩土力学, 2014, 35(12): 3377-3384. https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201412005.htm LIU Quan-sheng, QU Jia-wang, LIU Zhi-ping, et al. Experimental study of mechanical properties of cemented soil under corrosion influence[J]. Rock and Soil Mechanics, 2014, 35(12): 3377-3384. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTLX201412005.htm
[6]	杨俊杰, 孙涛, 张玥宸, 等. 腐蚀性场地形成的水泥土的劣化研究[J]. 岩土工程学报, 2012, 34(1): 130-138. https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201201013.htm YANG Jun-jie, SUN Tao, ZHANG Yue-chen, et al. Deterioration of soil cement stabilized in corrosive site[J]. Chinese Journal of Geotechnical Engineering, 2012, 34(1): 130-138. (in Chinese) https://www.cnki.com.cn/Article/CJFDTOTAL-YTGC201201013.htm
[7]	闫楠. 滨海相软土场地形成的水泥土强度衰减过程研究[D]. 青岛: 中国海洋大学, 2015. YAN Nan. Research on Strength Deterioration Process of Cement Soil in Site of Marine Soft Soil[D]. Qingdao: Ocean University of China, 2015. (in Chinese)