Rock and Soil Mechanics ›› 2022, Vol. 43 ›› Issue (2): 327-336.doi: 10.16285/j.rsm.2021.5135

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Physical and mechanical performance of quicklime-activated GGBS stabilized Hong Kong marine sediment at high water content

CAI Guang-hua1, 2, 3, ZHOU Yi-fan2, POON Chi Sun2, LI Jiang-shan3   

  1. 1. College of Civil and Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210037, China 2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong, China 3. State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
  • Online:2022-02-14 Published:2022-04-14
  • Contact: POON Chi-sun, male, born in 1987, PhD, PhD supervisor, research interests: environmental geotechnical engineering, solid waste recycling. E-mail:
  • About author:CAI Guang-hua, male, born in 1985, PhD, Associate Professor, Master supervisor, research interests: environmental geotechnical engineering, solid waste recycling.
  • Supported by:
    the National Natural Science Foundation of China/Hong Kong Research Grants Council Joint Research Scheme (No. N_PolyU511/18), the National Natural Science Foundation of China (No. 41902286, No. 51861165104) and the Open Fund for State Key Laboratory of Geotechnical Mechanics and Engineering (No. Z019026).

Abstract: The treatment of marine sediment has been a global-scale challenge. Portland cement (PC) is a widely-used binder in the conventional stabilization/solidification method. The use of PC can cause serious environmental pollution. In this context, the environment-friendly binder (blend of quicklime and ground granulated blast-furnace slag (GGBS)) has been adopted to replace PC in the soil remediation field. This study investigated the quicklime-activated GGBS for the stabilization of marine sediment at high water content. The physicochemical and unconfined compression tests were performed to analyze the physical, chemical, and strength characteristics of the quicklime-GGBS stabilized sediments. The results were compared with that of PC-stabilized sediment. As compared to the PC-stabilized sediment, the quicklime-GGBS stabilized sediment would generate larger volume shrinkage, lower water content, and slightly higher density. With reducing quicklime proportion and continuing curing time, the pH of the quicklime-GGBS stabilized sediment gradually decreases. The unconfined compressive strength of the lime-GGBS stabilized sediment shows a trend of first increasing (quicklime proportion of 0.05–0.15) and then decreasing (0.15–0.3) and finally increasing again (0.3–0.4). The maximum strengths appear at the lime-binder ratio of 0.15 and 0.4. The maximum strength at the quicklime-binder ratio of 0.15 is 1.4 times the same as the corresponding PC-stabilized sediment under the same condition. The findings indicate that the combination of GGBS with little quicklime has the potential to replace PC for stabilizing natural sediment at high water content.

Key words: marine sediment, quicklime, GGBS, quicklime-binder ratio, mechanical performance