Influence of wood-derived biochar on the compactibility and strength of silt loam soil

Ahmed, Ahmed; Gariépy, Yvan; Raghavan, V.

doi:10.1515/intag-2016-0044

Cited by 24 publications

(5 citation statements)

References 35 publications

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“…In our study, the soil was not excessively compacted with PR values below 2 MPa, which has been observed as a critical limit for root growth in a variety of soils [55]. Previous studies such as Reference [56] and Reference [20] have observed reductions of up to 66% in PR with biochar additions, but these were both in repacked soil cores at a lab scale and where two to 10 times more biochar was applied when compared to our study. These amounts may be unrealistic and uneconomic for farmers to apply.…”

Section: Biochar Effects On Soil Physical Propertiescontrasting

confidence: 46%

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Miscanthus Biochar had Limited Effects on Soil Physical Properties, Microbial Biomass, and Grain Yield in a Four-Year Field Experiment in Norway

et al. 2018

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The application of biochar to soils is a promising technique for increasing soil organic C and offsetting GHG emissions. However, large-scale adoption by farmers will likely require the proof of its utility to improve plant growth and soil quality. In this context, we conducted a four-year field experiment between October 2010 to October 2014 on a fertile silty clay loam Albeluvisol in Norway to assess the impact of biochar on soil physical properties, soil microbial biomass, and oat and barley yield. The following treatments were included: Control (soil), miscanthus biochar 8 t C ha−1 (BC8), miscanthus straw feedstock 8 t C ha−1 (MC8), and miscanthus biochar 25 t C ha−1 (BC25). Average volumetric water content at field capacity was significantly higher in BC25 when compared to the control due to changes in BD and total porosity. The biochar amendment had no effect on soil aggregate (2–6 mm) stability, pore size distribution, penetration resistance, soil microbial biomass C and N, and basal respiration. Biochar did not alter crop yields of oat and barley during the four growing seasons. In order to realize biochar’s climate mitigation potential, we suggest future research and development efforts should focus on improving the agronomic utility of biochar in engineered fertilizer and soil amendment products.

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Section: Biochar Effects On Soil Physical Propertiescontrasting

confidence: 46%

“…Once again, the mechanisms involved rely upon interactions between biochar and soil properties. In clay soils, biochar has been shown to reduce soil tensile strength and the plasticity index (degree of swelling/shrinkage), but usually requires large application rates [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Miscanthus Biochar had Limited Effects on Soil Physical Properties, Microbial Biomass, and Grain Yield in a Four-Year Field Experiment in Norway

et al. 2018

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“…Bora et al 22 reported an unaltered or decreased UCS value of silty sand due to increased biochar content. Ahmed et al 30 observed a decrease in shear strength on silty loam soil attributed to the biochar addition. Sadasivam and Reddy 15 and Xu et al 31 reported an increase in shear strength parameters owing to biochar application on silty clay and purely clay soil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Bamboo biochar on strength and water retention properties of low plastic clay and silty sand

Yadav

Bag

2023

Sci Rep

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Biochar is a carbon-rich stable product derived from the thermochemical decomposition of biomass. The properties of biochar vary with types of feedstock, heating rate, pyrolysis temperature, etc. Consequently, the mechanical and hydrological properties of biochar amended soil (BAS) also differ with types of biochar and soils. However, the effect of bamboo biochar (BB) amendment on soil strength and water retention properties is missing in the previous literature. Bamboo biomass was pyrolysed at 600 °C to produce biochar. BB and soils (low plastic clay (CL) and silty sand (SM)) were mixed to prepare BAS. The samples were prepared by mixing BB in five ratios, i.e., 0%, 1%, 2%, 3.5% and 5% of dry soil weight. The biochar application has increased optimum moisture content, alkalinity (pH) and Atterberg limits, whereas, reduced maximum dry density and specific gravity of both the soils (CL and SM). The unconfined compressive strength (UCS) of CL soil was noted to increase by 10.5% with 2% biochar content and decreased after that, whereas the UCS of SM soil was found to decrease continuously with the biochar content increment. Therefore, the unconfined compressive strength (UCS) result showed that biochar application has contrary effects on both soils. The measured gravimetric water content (GWC) of BAS was increased with biochar increment in both soils. However, GWC increased more in CL than in SM soil at the same biochar content. The microstructural analysis showed that the biochar amendment filled the pore space of the soil matrix, resulting in an increase in UCS and GWC values. The increased water retention capacity and strength (UCS) of biochar amended CL soil provides evidence that it could be used as a landfill cover material.

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“…Fiber reinforcement serves as a novel method for soil stabilization, aimed at enhancing geotechnical properties through the uniform integration of various fiber types, including wood, polypropylene, polyester, and polyethylene [7][8][9][10]. This technique notably improves the soil's shear, tensile, and compressive strengths, as well as its load-bearing capacity.…”

Section: Introductionmentioning

confidence: 99%

Reinforcement of Silty Soil via Regenerated Fiber Polymer: A Study on Microscopic Mechanisms

Liu,

Yan,

Liu

2023

Materials

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Utilizing regenerated polyester fibers (RPFs) for the reinforcement of silty road bases not only enhances the soil’s engineering performance but also offers a sustainable method for repurposing waste polyester bottles. To investigate the engineering properties and microscopic behaviors of this reinforced silty soil, a series of extensive physico-mechanical tests were conducted, supplemented by Scanning Electron Microscopy (SEM) analyses. These evaluations focused on the influence of variables such as fiber content, fiber length, moisture content, and curing duration on the modified soil’s performance. The fiber content of the test was 0–1%, and the fiber length was 6–17 mm. The results indicate that curing age had a less significant impact on liquid and plastic limits than the addition of fiber, along with a marginal decline in the plasticity index over time. The rate of shrinkage in the unmodified soil was between 1.04 and 1.45 times higher than that in the fiber-reinforced soil, indicating effective shrinkage control by the fibers. However, variations in maximum dry density (ρdmax) were insignificant across different fiber contents, while a slight increase was observed in the optimum moisture content (OMC) as fiber dosage increased. After a 28-day curing period, the resilient modulus and California Bearing Ratio (CBR) met highway road base design standards. A decline in unconfined compressive strength was noted when the fiber dosage exceeded 0.2%. The addition of fibers mitigated diagonal cracking and shifted the failure pattern towards a more ductile mode. This research contributes scientific insights for the broader application and promotion of silty road base improvement techniques using RPFs.

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Influence of wood-derived biochar on the compactibility and strength of silt loam soil

Cited by 24 publications

References 35 publications

Miscanthus Biochar had Limited Effects on Soil Physical Properties, Microbial Biomass, and Grain Yield in a Four-Year Field Experiment in Norway

Miscanthus Biochar had Limited Effects on Soil Physical Properties, Microbial Biomass, and Grain Yield in a Four-Year Field Experiment in Norway

Effect of Bamboo biochar on strength and water retention properties of low plastic clay and silty sand

Reinforcement of Silty Soil via Regenerated Fiber Polymer: A Study on Microscopic Mechanisms

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