Effect of Groundnut Shell Ash on Laterite Soils Stabilized with Lime for Civil Structures

Abstract

This study considered the practicality of groundnut shell ash (GSA) on laterite stabilized with lime for civil structures. Three site locations of lateritic soil named specimen I, II and III were assembled from Ifewara, Atakunmosa West Local Government Area, Ilesa East Local Government Area, and Ilesa West Local Government, all situated in Osun State, Nigeria. Preliminary tests were wrapped up on the soil specimens in their characteristic states and when stabilized with optimum lime. Compaction, California Bearing Ratio (CBR) and undrained triaxial shear strength tests were performed when fluctuating paces of 2 %, 4 %, 6 %, and 8 % of GSA were included to the soil specimens at optimum lime. The Atterberg limits tests showed a critical decrease in plasticity index for all the soil specimens when stabilized with lime. Compaction test showed a lessening in the maximum dry density from 1732 kg/m3 to 1651 kg/m3 for specimen I, 1874 kg/m3 to 1621 kg/m3 for specimen II and 1683 kg/m3 to 1655 kg/m3 for specimen III on stabilizing with lime, presentation of GSA to stabilized lime-soil decreases the maximum dry density for all the soil specimen with specimen I diminished to 1642 kg/m3, 1595 kg/m3, 1611 kg/m3 and 1611 kg/m3 at 2 %, 4 %, 6 % and 8 % GSA substances individually. Addition of GSA substances enhanced the engineering properties of laterite stabilized with lime as the unsoaked CBR values expanded for all the soil specimens. At optimum lime measurements, addition of 4 % GSA expanded the shear strength to 110.74 kN/m2 and 127.53 kN/m2 for specimens I and II individually while at 6 % GSA addition, the shear strength of specimen III was peak 118.24 kN/m2. The expansion in shear strength further affirms the improvement prior shown in the geotechnical properties of lateritic soil with the addition of groundnut shell ash. addition of 2 % GSA content extended the triaxial shear strength from 60.43kN/m2 to 188.36kN/m2 for specimen I, and at 4% GSA content, both soil specimens II and III expanded from 19.19kN/m2 to 201.48kN/m2 and 30.62kN/m2 to 111.65kN/m2 separately. Conclusively, GSA improved the durability and strength of lateritic soils stabilized with lime for civil structures.

Enhancing Soil with Low-Cost Pozzolanic Materials: Rice Husk Ash and Groundnut Shell Ash Compared to Cement

“…According to Mujedu and Adebara [13], it has been observed that groundnut shell ash can be used as a substitute for up to 30% of regular Portland cement in concrete, as stated by Albert et al in 2015 and reiterated by Mujedu and Adebara [13,23]. Furthermore, it has been employed as a supplementary component in conjunction with another additive, as indicated by Adetayo et al [36] in 2021, and Ikumapayi [12]. The replacement of groundnut shell ash (GSA) with ordinary Portland cement (OPC) is expected to enhance the resistance of the resultant concrete against chloride ion penetration.…”

The Effect of Groundnut Shell Ash on Soil Stabilization

“…Assessing the impact of stabilizers on soil strength involves looking at changes in consistency limits, compaction characteristics, undrained cohesion, and modulus of elasticity. The investigation of the durability properties of stabilized soil employed the augmentation of undrained shear strength over many days of curing by increasing the percentage of cement [1][2][3][4][5][6]. The stabilized soil's strength and uniformity increased to a suitable level [1].…”

“…Among other things, it's used as a fuel, a filler in animal feed, a substitute for plugs in hard particleboard, and activated carbon. In the semi-arid region, especially during the dry season, the large peanut shell is utilized to feed farmed animals [4]. This study aimed to investigated the effectiveness of groundnuts shell as stabilizer agent.…”