Original Articles
Vol. 52 No. 4 (2021)
https://doi.org/10.4081/jae.2021.1216

Effects of controlled burn rice husk ash on geotechnical properties of the soil

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Received: 13 June 2021
Accepted: 15 September 2021
Published: 23 December 2021
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Rice husk ash, compactability, unconfined compressive strength, bearing capacity, shear strength, scanning electron micrograph.

Authors

Najmun Nahar
najmun_nahar33@yahoo.com
Department of Environmental Science and Technology, Graduate School of Bioresources, Mie University, Tsu, Japan; Department of Geography and Environment, Faculty of Life and Earth Science, Jagannath University, Dhaka, Bangladesh.
Alex Otieno Owino
Department of Environmental Science and Technology, Graduate School of Bioresources, Mie University, Tsu, Japan.
Sayful Kabir Khan
https://orcid.org/0000-0002-5152-6622
Department of Environmental Science and Technology, Graduate School of Bioresources, Mie University, Tsu, Japan; Ministry of Food, Dhaka , Bangladesh.
Zakaria Hossain
Department of Environmental Science and Technology, Graduate School of Bioresources, Mie University, Tsu, Japan.
Noma Tamaki
Make Integrated Technology Company, Osaka, Japan.

Pozzolanic reactions of RHA entirely depends on controlled burning condition. The current study illustrates the effects of controlled burn rice husk ash (RHA) on the geotechnical properties of A-2-4 type soil. The compactibility, bearing capacity, compressive strength, and shear strength were investigated as the important geotechnical properties on soil with 0%, 5%, 10%, and 15% of RHA admixtures. Considering the 7-day moist curing, standard Proctor compaction tests, California Bearing Ratio (CBR) tests, Unconfined Compressive Strength (UCS) tests, Consolidated-Drained (CD) Triaxial Compression tests, and Scanning Electron Microscopy (SEM) tests were conducted on soil-RHA combinations. The test results showed that the optimum moisture content increased, but MDD reduced with the increment of RHA content. Soil with 5% RHA showed the increase of CBR (39.5%), UCS (6.0%), modulus of deformation (56.3%), cohesion (11.8%), and angle of internal friction (6.3%) compared to control specimen which indicated that the application of burnt RHA at a controlled temperature significantly enhanced the geotechnical properties of soil. SEM image on soil with 5% RHA also observed the best microstructural development.

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Citations

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“Effects of controlled burn rice husk ash on geotechnical properties of the soil” (2021) Journal of Agricultural Engineering, 52(4). doi:10.4081/jae.2021.1216.
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