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A Study on the Strength Characteristics of Expansive Soil Blended with Rice Husk Ash
Expansive soils are continuously creating a problem for geotechnical engineers because their intrinsic performance is too high under moisture conditions to alter the efficiency of swelling or shrinking. This alternate shrink-swell behavior of soft soil causes a decrease in soil shear strength, resulting in significant damage to the minimally loaded structural elements such as pavements, retaining walls, foundations, residential buildings, and canal beds. Hence, for mitigating the bearing capacity and volume change problems, waste additives are used with expansive soil for stabilization. Various additives on expansive soils have also gained recognition for their stabilizing properties. The current study investigates the effects of using agro-waste admixture as an additive for improving the strength characteristics of expansive soil using the UCC and CBR tests. The significant results show that adding rice husk ash content increases the optimal level of moisture content and highest dry density. The study results show that enhancing the rice husk ash content increased the unconfined compressive stress and California bearing ratio significantly. The UCS improved up to 817 kPa from 142 kPa as well as the CBR peak values improved to 17.29% from 2.41% and were reported at 12% RHA. It confirms that the optimum strength was attained at 12% RHA for strength advancement on expansive soil. The free swell index of expansive soil started to decrease the swell potential corresponding in proportion to the increase in the percentage of rice husk ash used to stabilize the expansive soil. However, the cost-benefits effectiveness can be attained in the subgrade soil of flexible pavement stabilized on the optimum percentage of RHA.
A Study on the Strength Characteristics of Expansive Soil Blended with Rice Husk Ash
Expansive soils are continuously creating a problem for geotechnical engineers because their intrinsic performance is too high under moisture conditions to alter the efficiency of swelling or shrinking. This alternate shrink-swell behavior of soft soil causes a decrease in soil shear strength, resulting in significant damage to the minimally loaded structural elements such as pavements, retaining walls, foundations, residential buildings, and canal beds. Hence, for mitigating the bearing capacity and volume change problems, waste additives are used with expansive soil for stabilization. Various additives on expansive soils have also gained recognition for their stabilizing properties. The current study investigates the effects of using agro-waste admixture as an additive for improving the strength characteristics of expansive soil using the UCC and CBR tests. The significant results show that adding rice husk ash content increases the optimal level of moisture content and highest dry density. The study results show that enhancing the rice husk ash content increased the unconfined compressive stress and California bearing ratio significantly. The UCS improved up to 817 kPa from 142 kPa as well as the CBR peak values improved to 17.29% from 2.41% and were reported at 12% RHA. It confirms that the optimum strength was attained at 12% RHA for strength advancement on expansive soil. The free swell index of expansive soil started to decrease the swell potential corresponding in proportion to the increase in the percentage of rice husk ash used to stabilize the expansive soil. However, the cost-benefits effectiveness can be attained in the subgrade soil of flexible pavement stabilized on the optimum percentage of RHA.
A Study on the Strength Characteristics of Expansive Soil Blended with Rice Husk Ash
Lecture Notes in Civil Engineering
Reddy, Krishna R. (editor) / Ravichandran, P. T. (editor) / Ayothiraman, R. (editor) / Joseph, Anil (editor) / Manimaran, Asaithambi (author) / Ravichandran, P. T. (author)
International Conference on Civil Engineering Innovative Development in Engineering Advances ; 2023 ; Kattankulathur, India
2024-01-31
9 pages
Article/Chapter (Book)
Electronic Resource
English
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