Biochar and Fly Ash Role in Improving Mechanical and Physical Properties of Vertisol

Malik, Zaffar; Jamil, Moazzam; Abassi, Ghulam Hassan; Nafees, Muhammmad; Rafey, Muhammad; Kamran, Muhammad

doi:10.17582/journal.sja/2017.33.1.151.161

Cited by 5 publications

(7 citation statements)

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“…Therefore, this mechanism minimizes soil expansion by minimizing the interaction of water with the expanding clay minerals. Furthermore, biochar and organic matter of the decomposed residues of the uncharred material might also have pores inside of their particles (intra-pores), which may provide additional space for water storage beyond the pore space between their particles (inter-pores) (Zaffar et al 2017;Rama Subbarao et al 2011).…”

Section: Atterberg Limitsmentioning

confidence: 99%

“…The introduction of amendments reduced the COLE core and, thus, the shrinkage and swelling hazard by altering the clay minerals responsible for the shrinkage and swelling properties of soil (Zaffar et al 2017). Several authors claim that the particles of biochar and decomposed crop residues may cover clay mineral phase surfaces and settle in the pore spaces among the soil particles, which then cause a significant reduction in swelling potential of the soil and, thus, lowering the COLE core value (Rama Subbarao et al 2011).…”

Section: Coefficient Of Linear Extensibility (Cole)mentioning

confidence: 99%

“…As discussed earlier, the amendment material has very low shrinkage potential. The addition of very low shrinking materials means reduction in the percentage of high shrinking materials in the mix (Zaffar et al 2017;Rama Subbarao et al 2011). Therefore, the percentage of overall crack area in the specimen is reduced as the amendment material application rate increases.…”

Section: Crack Area Density (Cad)mentioning

confidence: 99%

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Impact of agricultural waste on the shrink–swell behavior and cracking dynamics of expansive soils

Malongweni

Kihara

Sato

et al. 2019

Int J Recycl Org Waste Agricult

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Purpose The swelling characteristics and cracking of expansive clayey soils usually lead to their low yield, and as a result, large areas of expansive soils remain uncultivated and unproductive. There is a need for the development of simple, low-cost technologies which will bring these soils into production. The amendment of expansive clayey soils with agricultural waste products is a key goal for enhancing their production potential. Therefore, a study was conducted to evaluate the ameliorative effects of crop residues on the physiochemical and mechanical properties of expansive clayey soils. Method In this study, the potential soil amendments used include uncharred rice husk, rice husk biochar, uncharred sugarcane bagasse, and sugarcane bagasse biochar. The biochar was pyrolyzed at 450 °C. The amendments were applied into the soil at four applications rates: 0, 2, 5, and 10% by weight of soil (w/w), respectively. The mixture was then incubated in a glasshouse for 280 days. Results Charred and uncharred rice husk and sugarcane bagasse improved the physico-mechanical properties related to soil expansion. The liquid limit (LL), plastic limit (PL), plasticity (PI), coefficient of linier extensibility (COLE core), volumetric shrinkage (VS), fissures' dimensions, and crack area density (CAD) of the soil decreased with an increase in treatment application rate. On the contrary, saturated water content increased with an increase in dosage. Conclusions 10% level of amendment application resulted in significantly improved soil properties than either 2% or 5% doses. Moreover, 2% level of amendment application is more preferable than 5% according to feasibility and economic point of view.

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Section: Atterberg Limitsmentioning

confidence: 99%

Section: Coefficient Of Linear Extensibility (Cole)mentioning

confidence: 99%

Section: Crack Area Density (Cad)mentioning

confidence: 99%

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Impact of agricultural waste on the shrink–swell behavior and cracking dynamics of expansive soils

Malongweni

Kihara

Sato

et al. 2019

Int J Recycl Org Waste Agricult

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“…The high values of COLE, SR and PLE were in NC soil indicating shrinkage hazards. The VC and FC soils had low shrinkage hazards by altering the total volume reduction associated with clay content or change in clay minerals responsible for the COLE, SR and PLE (Lu et al 2014 ;Malik et al 2017 ). Organic matter improves linear shrinkage of clayey soil (Manukaji, 2013;Abd El Halim and El Baroudy, 2014).…”

Section: Fig 4 Coefficient Of Linear Extensibility (Cole) With Cultivation Systems (Ft Is Fruit Trees Fc Is Field Crops Vc Is Vegetables mentioning

confidence: 99%

“…Most soils change volume with change in water content. COLE is used to measure the shrink-swell capacity of soil (Malik et al 2017). Shrinkage ratio (SR) is the ratio of a given volume change to the corresponding change in water content.…”

Section: Introductionmentioning

confidence: 99%

Soil Shrinkage, Sealing Index and Hydro-Physical Properties of Vertisols as Influenced by Long-Term Cultivation Systems in Northern Egypt

Bassouny

2018

Journal of Soil Sciences and Agricultural Engineering

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Soil shrinkage and sealing index are important for understanding water and solute transport in soils. Effects of long-term cultivation systems on the soil shrinkage, sealing and hydro-physical properties of Vertisols in Kafr El-Sheikh Governorate, Northern Egypt were studied. The cultivation systems were fruit trees (FT), field crops (FC), vegetables crops (VC), and noncultivated soil (NC). Forty eight samples were collected from sixteen soil profiles (three layers: 0-30, 30-60 and 60-100 cm) from different locations. The studied parameters included coefficient of linear extensibility (COLE), shrinkage ratio (SR), potential linear extensibility (PLE), soil sealing index (SI), bulk density (BD), penetration resistance (PR), saturated hydraulic conductivity (Ks) and soil water content (SWC). Long-term cultivation improved soil shrinkage, sealing and hydro-physical properties. Soil organic matter (SOM) and silt + clay contents increased in VC and FC compared with FT and NC systems in all layers (p < 0.05). The BD and PR decreased in all systems, and in VC and FC systems it was prominent compared with NC system. Ks and SWC increased (p <0.05) under VC and FC than in NC system. Low COLE, SR and PLE occurred in all systems particularly in VC and FC system. The VC and FC reduced shrinkage hazards, while high COLE, SR and PLE occurred in NC, indicating shrinkage hazards. The SI was significantly (p <0.05) affected by cultivation systems and sealing was low in soils of VC, FC and FT than NC. Each of COLE, SR and PLE showed a negative correlation (p < 0.01) with SOM, but a positive one with BD and PR (p < 0.01). Each of COLE and SR (p < 0.05) and PLE (p < 0.01) showed negative correlations with SWC and Ks. SI showed a negative correlation with each of COLE, SR, BD and PR (p < 0.01) and PLE (p < 0.05), and a positive one with SWC and Ks (p < 0.05). VC and FC improved the soil shrinkage, sealing index and hydro-physical properties of Vertisols.

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Effect of biochar on desiccation of marine soils under constant and cyclic temperatures

et al. 2022

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Biochar has recently been gaining increasing attention as a stable and sustainable soil amendment material. However, the effect of biochar amendment on the desiccation behaviour of coastal soils has not yet been examined. Consequently, the present study primarily investigated the effect of exposing biochar-amended marine soil (BAS) to constant and cyclic temperatures on its swell–shrink, evaporation and desiccation cracking characteristics. Biochar contents of 1%, 2%, 4% and particle size ranges of PS-1 (600 μm < D ≤ 2000 μm), PS-2 (300 μm < D ≤ 600 μm), PS-3 (D ≤ 75 μm) (D: biochar particle diameter) were employed. It was revealed that the absolute volumetric shrinkage of both unamended and biochar-amended specimens increased as the number of thermal cycles increased. Under continuous heat exposure, 4% (PS-3) BAS in compacted state achieved the maximum reduction in volumetric shrinkage which was 42%. Moreover, under continuous heat exposure, 2% (PS-1) BAS in slurry state achieved the highest reduction in desiccation cracking, which was 73%. The present study highlights the importance of identifying the most effective combination of biochar content and particle size required to achieve a desired outcome, in order to gain the maximum benefit of biochar as an amendment material at the lowest possible cost.

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Biochar and Fly Ash Role in Improving Mechanical and Physical Properties of Vertisol

Cited by 5 publications

References 0 publications

Impact of agricultural waste on the shrink–swell behavior and cracking dynamics of expansive soils

Impact of agricultural waste on the shrink–swell behavior and cracking dynamics of expansive soils

Soil Shrinkage, Sealing Index and Hydro-Physical Properties of Vertisols as Influenced by Long-Term Cultivation Systems in Northern Egypt

Effect of biochar on desiccation of marine soils under constant and cyclic temperatures

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