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Cement-SG curing agent for solidification of mucky soils

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Abstract

The SG compound admixture comprising sodium silicate and gypsum was introduced into cement-solidified mucky soil and investigated using orthogonal testing. Unconfined compressive strength, three durability tests (i.e., water immersion, cyclic dry–wet, and cyclic freeze–thaw tests), scanning electron microscopy (SEM), and X-ray diffraction (XRD) analysis were conducted to optimize the composition of the additive agent and its content required to stabilize most effectively mucky soil. To study the different age and cement-SG mud quality and effectiveness of stabilized soil and its driving mechanism. The results show that there was an optimal content of cement-SG curing agent achieved with 18% of cement and 12.64% of SG additive of the mass of mucky soil. The curing strength reached the maximum values of 1160 kPa and 2617 kPa after 7 and 90 days. The strengthening effect of cement-SG composite-solidifying agent with the same mass content was markedly better than that of pure cement at different ages. Using SEM and XRD analysis of cement-SG solidified soil at the age of 28 days, it was found that the contents of calcium hydroxide crystals, calcium silicate hydrate, and ettringite in cement-SG-solidified soil are higher than those in cement-solidified soil, which significantly enhances the compactness of cement-SG-solidified soil compared to that of cement-solidified soil. Cement-SG-solidified soil was also superior to cement-solidified soil in impermeability, freeze–thaw resistance, and dry–wet resistance.

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Data Availability

The open project of Guangxi Key Laboratory for Disaster Prevention, Reduction and Structural Safety, project approval No. 2019ZDK051, 2019.10.30-2021.9.30.

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Funding

This work was supported by the Systematic Project of Guangxi Key Laboratory of Disaster Prevention and Engineering Safety (Grant No. 2019ZDK051).

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Authors and Affiliations

  1. School of Environment and Civil Engineering, Chengdu University of Technology, Chengdu, 610059, China

    Meng Wei, Yang Yang, Wangzheng Wu & Kunhong Zhong

  2. Sichuan Water Development Investigation, Design and Research Co. Ltd, Chengdu, 610213, China

    Yang Yang

  3. School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang, 330013, China

    Liangxiao Xiong

  4. Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning, 530004, China

    Liangxiao Xiong

  5. China Railway Eryuan Engineering Group Co. Ltd, Chengdu, 610031, China

    Tao Feng

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  1. Meng Wei
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  2. Yang Yang
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  3. Liangxiao Xiong
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  4. Wangzheng Wu
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  5. Tao Feng
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Correspondence to Yang Yang.

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Wei, M., Yang, Y., Xiong, L. et al. Cement-SG curing agent for solidification of mucky soils. Bull Eng Geol Environ 82, 236 (2023). https://doi.org/10.1007/s10064-023-03241-0

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