Influence of Organic Matter Content on Engineering Properties of Clays

Gui, Yewei; Zhang, Qiumin; Qin, Xiaqiang; Wang, Jianfei

doi:10.1155/2021/6654121

Cited by 16 publications

(7 citation statements)

References 27 publications

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“…Sewage sludge is typically characterized by high liquid limit and plasticity index, as well as natural water content, all of which are typically greater than 200%. This is similar to the behaviour of some soils with high organic content (e.g., [20,21]).…”

Section: Composition Of Sewage and Wastewater Sludgesupporting

confidence: 83%

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Lim

Goh

et al. 2021

Geotechnics

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Although there has been a substantial body of research on the chemical stabilization of sewage sludge, most of these results are project-specific and relate mainly to the use of new binders and sewage sludge from specific sources. In this sense, much of the work to date is context-specific. At present, there is still no general framework for estimating the strength of the chemically treated sludge. This paper proposes one such general framework, based on data from some recent studies. An in-depth re-interpretation of the data is first conducted, leading to the observation that sludge, which has coarse, hard particulate inclusions, such as sand, premixed into it, gives significantly higher strength. This was attributed to the hard coarse particles that lower the void ratio of treated soil, are much less susceptible to volume collapse under pressure, and contribute to the strength through frictional contacts and interlocking. This motivates the postulation of a general framework, based on the premise that coarse, hard particulate inclusions in the sludge which do not react with the binders can nonetheless contribute to the strength of the treated soil. The overall void ratio, defined as the volume of voids in the cementitious matrix normalised by the overall volume, is proposed as a parameter for quantifying the combined effect of the coarse particulate inclusions and the cementitious matrix. The binder-sludge ratio is another parameter which quantifies the strength of the cementitious matrix, excluding the hard particulate inclusions. Back-analysis of the data suggests that the significance of the binder-sludge ratio may diminish as the content of hard particulate inclusions increases.

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Section: Composition Of Sewage and Wastewater Sludgesupporting

confidence: 83%

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Lim

Goh

et al. 2021

Geotechnics

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“…The greatest plastic limit (PL, 29%) was on soil 32, the soil with the greatest rock content (47%). The PL was measured on the soil particles less than 0.4 mm in diameter (table 2), and the large PL measurement on soil 32 may have been due to the high organic carbon content of that soil (2.3%; Gui et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

Estimating WEPP Cropland Erodibility Values From Soil Properties

Elliot¹,

Flanagan²

2023

Journal of the ASABE

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HIGHLIGHTS• Very fine sand is the single most important variable for predicting rill and interrill erodibility values.• Slope steepness is the most important property for predicting critical shear for rill erosion.• Erodibility prediction equations with the best goodness-of-fits have both soil texture and mineralogy terms.• Equations to predict erodibility from texture, organic carbon, cation exchange, slope, and taxonomy are proposed.

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“…In silty soil, the specific gravity was found to be 2.5-2.6, representing a slightly lower value than silt's ideal specific gravity (2.70). This phenomenon is attributed to the organic matter in silty soil (Gui et al 2021). The organic content of the tested soil samples was in the range of 1.4 to 6.2%, with an average value of 4.25%.…”

Section: Index Properties Of Soilmentioning

confidence: 91%

Geological and soil engineering properties of shallow landslides occurring in the Kutupalong Rohingya Camp in Cox’s Bazar, Bangladesh

et al. 2022

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The Forcibly Displaced Myanmar Nationals (FDMN), historically known as ‘Rohingya’ who fled the 2017 ethnic atrocities and genocide in the Northern Rakhine State of Myanmar, took shelter in Cox’s Bazar District of Bangladesh. The camp network, known as Kutupalong Rohingya Camp (KRC), is situated in the tectonically active tertiary hilly terrain. The KRC has been experiencing hydrometeorological hazards, where landslides are frequent. This study investigated the slopes’ geological condition, engineering properties and human interventions, which influence the landslides. The exposed slopes were relatively high (> 10 m) and steep ranging from 40° to 60° that have numerous polygonal tension cracks and fissures. From the geological and geotechnical aspects, there are three successive units of slope materials: (1) residual soils of sandy silt with clay, (2) highly weathered silty sandstones and (3) shale/clay with silt and fine sand intercalations at the bottom of the slopes. Field observations revealed that most slope failures occurred in the residual soil and weathered silty sandstone units. The residual soils have a bulk density of 1.49–1.97 g/cm3, a liquid limit of 25–48%, a plasticity index of 5–16% and an undrained shear strength of 23–46 kPa. The silty sandstones have a bulk density of 1.44–1.94 g/cm3, an internal friction angle of 34°–40° and a cohesion of 0.5–13 kPa. The mineralogical composition determined by the X-ray diffraction shows low clay mineral content, which does not affect landslides. However, the slope geometry, low shear strength with strain softening properties and torrential rainfall accompanied by anthropogenic factors cause numerous landslides every year. This study will help take proper mitigation and preparedness measures for slope protection in the KRC area and surroundings.

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Influence of Organic Matter Content on Engineering Properties of Clays

Cited by 16 publications

References 27 publications

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Strength of Chemically Stabilized Sewage Sludge—Some Inferences from Recent Studies

Estimating WEPP Cropland Erodibility Values From Soil Properties

Geological and soil engineering properties of shallow landslides occurring in the Kutupalong Rohingya Camp in Cox’s Bazar, Bangladesh

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