生石灰激发GGBS固化高含水率香港海相沉积物的物理力学性质研究

Translated title of the contribution: Physical and mechanical performance of quicklime-activated GGBS stabilized Hong Kong marine sediment at high water content

Guang Hua Cai, Yi Fan Zhou, Chi Sun Poon, Jiang Shan Li

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The treatment of marine sediment has been a global-scale challenge. Portland cement (PC) is widely-used binder in the conventional stabilization/solidification method. 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 measurements 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-binder ratio 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 quicklime-binder ratios of 0.15 and 0.4. The maximum strength at the quicklime-binder ratio of 0.15 is 1.4 times than 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.

Translated title of the contributionPhysical and mechanical performance of quicklime-activated GGBS stabilized Hong Kong marine sediment at high water content
Original languageChinese (Simplified)
Pages (from-to)327-336
Number of pages10
JournalYantu Lixue/Rock and Soil Mechanics
Volume43
Issue number2
DOIs
Publication statusPublished - 10 Feb 2022

Keywords

  • Ground granulated blast-furnace slag (GGBS)
  • Marine sediment
  • Mechanical performance
  • Quicklime
  • Quicklime-binder ratio

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

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