ISSN : 2488-8648
International Journal of Basic Science and Technology
A publication of the Faculty of Science, Federal University Otuoke, Bayelsa State
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ISSN : 2488-8648
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×published date:2023-Jul-14
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Abstract
The aim of this research was to assess the impact of calcium carbide (CaC2) as an activator of bamboo stem ash (BSA) in stabilizing lateritic soil. Bamboo stem ash was calcined at 800oC. The X-Ray Fluorescence (XRF) test carried out on ordinary bamboo stem ash, 800oC calcined ashes, and CaC2. The pozzolanic contents of these materials were calculated to be 17.06%, 86.37% and 82.91% respectively. The calcined bamboo stem ash was adopted for this research since its pozzolanic content was greater than 70%. The engineering properties of the lateritic soil were determined using ASTM standards, while the Maximum Dry Density (MDD) and the Optimum Moisture Content (OMC) were obtained using three different standards namely: ASTM standard, British standard, and West Africa standard. The soil was classified as A-2-4 according to AASHTO and as a well graded sand according to USCS. Soil-BSA blends were composed at 5, 10, 15, and 20% of BSA by weight of the soil, and soil blend containing 15% BSA gave the highest unsoaked CBR value of 45.74%. The activation effect of CaC2 was tested on this soil blend. The CaC2 was added to soil-15% BSA blend at 5,10,15, and 20% by weight of the soil. No substantial impact on the MDD was obtained with the compactive efforts. There was improvement in the unsoaked CBR values when compared with the natural soil, with maximum value of 41% obtained with soil + 15% BSA + 20% CaC2. Therefore, higher quantity of CaC2 is required for substantial activation impact on the soil-BSA blend. However, both BSA and CaC2 have the potential to stabilize A-2-4 lateritic soil for subgrade or sub-base application
Keywords: Calcium carbide, Activator, Stabilization, Lateritic soil , Bamboo stem ash
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