Use of self-hardening slurry for trench cutoff wall: A review

Huang, Xiao; Li, Jiangshan; Xue, Qi‐Kun; Chen, Zhe; Du, Yong; Wan, Yong; Liu, Lei; Poon, Chi Sun

doi:10.1016/j.conbuildmat.2021.122959

Cited by 34 publications

(23 citation statements)

References 57 publications

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“…Vertical barriers have been employed for decades to control groundwater flow and subsurface contaminant transport [ 13 , 14 ]. There are two types of in-ground barriers, namely active and passive.…”

Section: Introductionmentioning

confidence: 99%

Vertical Barriers for Land Contamination Containment: A Review

Cao

Wang

et al. 2021

IJERPH

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Soil pollution is one of the major threats to the environment and jeopardizes the provision of key soil ecosystem services. Vertical barriers, including slurry trench walls and walls constructed with soil mix technology, have been employed for decades to control groundwater flow and subsurface contaminant transport. This paper comprehensively reviewed and assessed the typical materials and mechanical and permeability properties of soil–bentonite, cement–bentonite and soil mix barriers, with the values of mix design and engineering properties summarized and compared. In addition, the damage and durability of barrier materials under mechanical, chemical, and environmental stresses were discussed. A number of landmark remediation projects were documented to demonstrate the effectiveness of the use of barrier systems. Recent research about crack-resistant and self-healing barrier materials incorporating polymers and minerals at Cambridge University and performance monitoring techniques were analyzed. Future work should focus on two main areas: the use of geophysical methods for non-destructive monitoring and the optimization of resilient barrier materials.

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Section: Introductionmentioning

confidence: 99%

Vertical Barriers for Land Contamination Containment: A Review

Cao

Wang

et al. 2021

IJERPH

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“…Clay mineral aqueous slurries have been used in drilling and civil engineering for centuries. Beginning in the 1960s, however, bentonite-water slurries were enriched with cement binder, which resulted in their transformation into a solid body, owing to cement binding and hardening, after the fluidity period required during trench excavation [ 1 ]. These so-called “hardening slurries” can be therefore defined as mixtures of water, binder (usually cement-based), and clay mineral (usually bentonite) with other optional additives [ 2 ].…”

Section: Introductionmentioning

confidence: 99%

“…Symptoms evidencing susceptibility to aggression are mass loss, strength reduction, and an increasing filtration coefficient [ 4 ]. A review by Huang et al [ 1 ] claims that poor resistance to sulfates and acids is a major problem for many common slurry mixes; ability to immobilize heavy metals: the use of industrial waste in the composition of a hardening slurry poses a risk of pollutants (e.g., heavy metals) contained therein being released to groundwater. Immobilization testing involves, e.g., measuring heavy metal content in filtrates originating from the hardening slurry specimen filtration testing [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Past research provides well-documented proof of the feasibility of using granulated blast furnace slag and fly ash from coal fired power plants in hardening slurries [ 1 , 2 ], but CBPs from fluidized-bed furnaces, especially those burning non-coal fuels, have been comparatively less thoroughly tested in this field [ 7 , 10 , 15 ].…”

Section: Introductionmentioning

confidence: 99%

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Hardening Slurries with Fluidized-Bed Combustion By-Products and Their Potential Significance in Terms of Circular Economy

et al. 2021

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Hardening slurries (water-bentonite-binder mixtures) constitute a well-established material used broadly, i.a., for cut-off walls in civil and water engineering. Although they usually contain Portland cement, similar to common concrete, their properties differ greatly, mostly due to a much higher water content. This characteristic of hardening slurries creates unique opportunities for the utilization of significant quantities of industrial by-products that are deemed problematic in the concrete industry. This article investigates the effect of the addition of by-products of fluidized-bed combustion of hard, brown coal and municipal sewage sludge, as well as ground granulated blast furnace slag, on the properties of slurries. Unconfined compressive strength tests, as well as mercury porosimetry, scanning electron microscopy, and X-ray diffraction analyses were performed. The results suggest that it is possible to design hardening slurry mixes of desired properties, both in liquid and solid state, containing at least 100–300 kg/m3 of industrial waste. This includes cement-free slurries based entirely on industrial by-products as binders. In addition, the analyzed slurries exhibited good chemical resistance to landfill eluates, at the same time effectively immobilizing heavy metals. It was concluded that hardening slurry technology can ensure the safe deposition of significant amounts of waste that would be otherwise difficult to manage, thus contributing to the circular economy concept.

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Chemical Compatibility of Polymer-Amended Bentonite–Sand Cutoff Wall Backfills Exposed to Copper Contaminants

Cui,

Chen

2024

Environmental Science and Engineering

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Use of self-hardening slurry for trench cutoff wall: A review

Cited by 34 publications

References 57 publications

Vertical Barriers for Land Contamination Containment: A Review

Vertical Barriers for Land Contamination Containment: A Review

Hardening Slurries with Fluidized-Bed Combustion By-Products and Their Potential Significance in Terms of Circular Economy

Chemical Compatibility of Polymer-Amended Bentonite–Sand Cutoff Wall Backfills Exposed to Copper Contaminants

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