Cement Stabilization of Indian Peat: An Experimental Investigation

Paul, Abhinaba; Hussain, Monowar

doi:10.1061/(asce)mt.1943-5533.0003363

Cited by 35 publications

(23 citation statements)

References 49 publications

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“…The SSP dosage varied from 0 to 50% (refer to cases 2-12). The range of the SSP dosage was reasonably chosen to be similar to the typical dosage of PC used to stabilize peat deposits (Paul and Hussain, 2020). The binder (MICP) dosage varied for three different levels (refer to cases 13-15).…”

Section: Designsmentioning

confidence: 99%

“…A number of previous studies disclosed that the compressibility of peat deposits is governed by many factors, such as water content, density, characteristics of fibers, degree of decomposition, and existence of inorganic minerals (Zulkifley et al, 2014;O'Kelly, 2017;Paul and Hussain, 2020). Here, the major mechanism for the SSP dosage to enhance the strength of the peat is possibly the densification of the peat.…”

Section: Unconfined Compressive Strengthmentioning

confidence: 99%

“…Peatlands are present in various parts of the world, and their coverage has been estimated to be nearly 8% of the Earth's surface (which is equivalent to 4.23 million km 2 ) (Mesri and Ajlouni, 2007;Xu et al, 2018). The problem related to peat deposits is their low bulk density, low shear strength, and extreme compressibility (Huat et al, 2014;Paul and Hussain, 2020). Because of poor engineering characteristics, infrastructure developments on peatlands often pose risks regarding bearing capacity failure and excessive total and/or differential settlements.…”

Section: Introductionmentioning

confidence: 99%

“…The biggest challenge in the former techniques was unaffordability, as they required high performance equipment and substantial energy. In the meantime, chemical binders (e.g., Portland cement (PC), fly ash, blast furnace slag, bentonite, and gypsum) were also used to improve the usability of the peat (Aiken et al, 2020;Hebib and Farrell, 2003;Paul and Hussain, 2020;Zulkifley et al, 2014). The PC was the most recommended binder among them, involving hydration processes to harden the peat (Kalantari, 2010;Paul and Hussain, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…In the meantime, chemical binders (e.g., Portland cement (PC), fly ash, blast furnace slag, bentonite, and gypsum) were also used to improve the usability of the peat (Aiken et al, 2020;Hebib and Farrell, 2003;Paul and Hussain, 2020;Zulkifley et al, 2014). The PC was the most recommended binder among them, involving hydration processes to harden the peat (Kalantari, 2010;Paul and Hussain, 2020). However, as indicated by Benhelal et al (2012), a drawback of most of the binders is that their production largely contributes to environmental issues by releasing CO 2 and SO 2 gases.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Scallop Powder Addition on MICP Treatment of Amorphous Peat

Gowthaman

Chen

Nakashima

et al. 2021

Front. Environ. Sci.

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Peat is one of the most challenging and problematic soils in the fields of geotechnical and environmental engineering. The most critical problems related to peat soils are extremely low strength and high compressibility, resulting in poor inhabitancy and infrastructural developments in their vicinity. Thus far, peat soils were stabilized using Portland cement; however, the production of Portland cement causes significant emission of greenhouse gases, which is not environmentally desirable. Microbial-induced carbonate precipitation (MICP) is an innovative technique for improving the mechanical properties of soil through potentially environmentally friendly processes. This article presents a laboratory study carried out with the aim of investigating the viability and effect of scallop shell powder (SSP) on enhancing the mechanical properties of the MICP-treated amorphous peat. The hypothesis was that the distribution of SSP (as-derived calcite particles) would (i) provide more nucleation sites to precipitates and (ii) increase the connectivity of MICP bridges to facilitate mineral skeleton to amorphous peat, accompanied by an increase in its compressive strength. Specimens were treated at varying combinations of SSP and MICP reagents, and the improvement was comprehensively assessed through a series of unconfined compression tests and supported by microscale and chemical analyses such as scanning electron microscopy, energy-dispersive X-ray analysis, and X-ray diffraction analysis. The outcomes showed that incorporating SSP in MICP treatment would be a promising approach to treat amorphous peat soils. The proposed approach could improve the unconfined compressive strength by over 200% after a 7-day curing period, while the conventional MICP could not exhibit any significant improvements.

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Section: Designsmentioning

confidence: 99%

Section: Unconfined Compressive Strengthmentioning

confidence: 99%