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: 3135
Citations: Bibtex RefMan EndNote GB/T7714
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.
@article{title="Influence of wet-dry cycles on vertical cutoff walls made of reactive magnesia-slag-bentonite-soil mixtures",
author="Hao-liang Wu, Fei Jin, Yan-jun Du",
journal="Journal of Zhejiang University Science A",
volume="20",
number="12",
pages="948-960",
year="2019",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1900300"
}
%0 Journal Article
%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
%J Journal of Zhejiang University SCIENCE A
%V 20
%N 12
%P 948-960
%@ 1673-565X
%D 2019
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1900300
TY - JOUR
T1 - Influence of wet-dry cycles on vertical cutoff walls made of reactive magnesia-slag-bentonite-soil mixtures
A1 - Hao-liang Wu
A1 - Fei Jin
A1 - Yan-jun Du
J0 - Journal of Zhejiang University Science A
VL - 20
IS - 12
SP - 948
EP - 960
%@ 1673-565X
Y1 - 2019
PB - Zhejiang University Press & Springer
ER -
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.
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