| Abstrakt: |
This research considered the viability of groundnut shell ash (GSA) on lime-stabilized lateritic soil for highway structural works. Three samples of lateritic soil, named samples A, B, and C, were gathered from Idita-Mokuro, NTA-Mokuro, and ETF burrow pits, respectively, in Ile-Ife, Osun State, Nigeria. Preliminary tests were completed on the samples in their natural states and when stabilized with optimum lime. Engineering properties were performed while 2, 4, and 6 % GSA contents were added to the soil samples at optimum lime. The Atterberg limit tests showed a significant reduction in the plasticity index for samples A and C when stabilized with lime. Compaction test showed a decrease in the maximum dry density from 1,685 to 1,590 kg/m³ for sample A, 1,599 to 1,512 kg/m³ for sample B, and 1,396 to 1,270 kg/m³ for sample C on stabilizing with lime; the introduction of GSA to stabilized lime soil diminished the maximum dry density for all the soil samples, with sample A reduced to 1,435 and 1,385 kg/m³ at 2 and 4 GSA contents, respectively. The addition of GSA improved the engineering properties of limestabilized soils as the unsoaked CBR esteems expanded for all soil samples. At an optimum lime dosage, the addition of 2 % GSA expanded the triaxial shear strength from 60.43 to 188.36 kN/m² for sample A and, at 4 % GSA content, both soil samples B and C increased from 19.19 to 201.48 kN/m² and 30.62 to 111.65 kN/m², respectively. Conclusively, GSA improved the toughness and strength of lime-stabilized lateritic soil for highway structural works. [ABSTRACT FROM AUTHOR] |
