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CLC number: TU45

On-line Access: 2019-12-09

Received: 2019-06-30

Revision Accepted: 2019-10-23

Crosschecked: 2019-11-07

Cited: 0

Clicked: 501

Citations:  Bibtex RefMan EndNote GB/T7714

 ORCID:

Hao-liang Wu

https://orcid.org/0000-0002-2580-6719

Fei Jin

https://orcid.org/0000-0003-0899-7063

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Journal of Zhejiang University SCIENCE A 2019 Vol.20 No.12 P.948-960

http://doi.org/10.1631/jzus.A1900300


Influence of wet-dry cycles on vertical cutoff walls made of reactive magnesia-slag-bentonite-soil mixtures


Author(s):  Hao-liang Wu, Fei Jin, Yan-jun Du

Affiliation(s):  Jiangsu Key Laboratory of Urban Underground Engineering & Environmental Safety, Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China; more

Corresponding email(s):   duyanjun@seu.edu.cn

Key Words:  Cutoff wall, Reactive MgO-activated ground granulated blast furnace slag (GGBS), Durability, Wet-dry cycles, Carbonation


Hao-liang Wu, Fei Jin, Yan-jun Du. Influence of wet-dry cycles on vertical cutoff walls made of reactive magnesia-slag-bentonite-soil mixtures[J]. Journal of Zhejiang University Science A, 2019, 20(12): 948-960.

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author="Hao-liang Wu, Fei Jin, Yan-jun Du",
journal="Journal of Zhejiang University Science A",
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pages="948-960",
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publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900300"
}

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%T Influence of wet-dry cycles on vertical cutoff walls made of reactive magnesia-slag-bentonite-soil mixtures
%A Hao-liang Wu
%A Fei Jin
%A Yan-jun Du
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%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1900300

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A1 - Yan-jun Du
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PB - Zhejiang University Press & Springer
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DOI - 10.1631/jzus.A1900300


Abstract: 
The strength and hydraulic conductivity of vertical cutoff walls consisting of reactive magnesia-activated ground granulated blast furnace slag (GGBS), bentonite, and soil (MSB) have been investigated in previous studies. However, there has been little comprehensive study of the influence of wet-dry cycles on the mechanical and microstructural properties of MSB backfills. In this paper, the durability of MSB backfills when exposed to wet-dry cycles is investigated. The variations in mass change, dry density, pH value, pore size distribution, and mineralogy are discussed. The results show that the mass change of ordinary Portland cement (OPC)-based and MSB backfills increases with respect to wet-dry cycles. The MSB backfills exhibit up to 8.2% higher mass change than OPC-based ones after 10 wet-dry cycles. The dry density, pH value, and unconfined compressive strength of MSB backfill decrease with the increasing number of wet-dry cycles. Increasing the GGBS-MgO content from 5% to 10% in MSB backfills results in 2.1–2.3 times higher strength, corresponding to a reduction of 2%–12% in cumulative pore volume; while increasing the bentonite content slightly reduces the strength of MSB mixtures, corresponding to an increase of cumulative pore volume by 4.6%–7.9%. The hydrotalcite-like phases and calcium silicate hydrate (C-S-H) are the primary hydration products in MSB backfills. Moreover, the continuous wet-dry cycles result in the precipitation of calcite and nesquehonite.

Cut-off wall is a useful technology to control the risks of contaminated source in soil. The idea in this work that using cement-bentonite-soil as backfill materials is novel and of practical significance. To replace OPC with more sustainable MgO-GGBS is also a novel approach. Adequate experiments were conducted with very nice and clear figures to support the discussions. More discussions are needed to elaborate the interesting findings and their implications in this work.

干湿循环作用下氧化镁激发矿渣-膨润土竖向隔离墙耐久特性研究

目的:1. 研究干湿循环作用下氧化镁激发矿渣-膨润土(MSB)竖向隔离墙的耐久特性. 2. 探讨干湿循环过程中循环级数对隔离墙的质量变化、干密度、pH值、无侧限抗压强度、孔隙结构和微观产物等的影响,并探究MSB的服役性能.
创新点:1. 通过干湿循环作用,揭示新型MSB隔离墙与传统水泥基(OPC)隔离墙的耐久性差异; 2. 通过微观分析,成功测定新型MSB隔离墙干湿循环后形成的水化产物.
方法:1. 通过宏观实验分析,在干湿循环作用下比较MSB隔离墙和OPC隔离墙的质量、干密度、pH值和无侧限抗压强度等参数的变化情况(图2和4~6); 2. 通过微观分析,研究MSB隔离墙中氧化镁激发高炉矿渣(GGBS-MgO)和膨润土的掺量对空隙结构的影响(图8),并探讨干湿循环作用如何影响碳酸钙和碳酸镁等水化产物的形成(图9).
结论:1. MSB隔离墙的质量损失比OPC隔离墙高1.1%~2.1%; 2. MSB和OPC隔离墙的干密度和pH值均随干湿循环级数的增长而减小; 3. MSB和OPC隔离墙的无侧限抗压强度随干湿循环级数的增长而降低; 4. 增加GGBS-MgO的掺量可减少2%~12%的累计进汞量,而增加膨润土的掺量会增加4.6%~7.9%的进汞量; 5. 干湿循环可加速碳酸钙和碳酸镁等水化产物的形成.

关键词:竖向隔离墙; 氧化镁激发矿渣; 耐久特性; 干湿循环; 碳化

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

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