EFFECT OF ASHING TEMPERATURE ON THE PERFORMANCE OF RICE HUSK ASH (RHA) IN SOIL STABILIZATION
Volume Title: ICASGE2025
Paper ID : 1001-ICASGE-FULL
Authors
Department of Civil Engineering, Faculty of Engineering, Bayero university, Kano, Nigeria
Abstract
This study investigates the effect of ashing temperature on effective performance of Rice Husk Ash (RHA) in soil stabilization. The study involves determination of the chemical composition of the RHA and the index and engineering properties of the soil sample treated with RHA at 0, 2, 4, 6, 8, 10, and 12% processed at 600oC, 650o, 700oC, 800oC and 1000oC temperatures. The result of x-ray fluorescence (XRF) revealed that RHA possessed pozzolanic reactivity especially at 650oC. The soil used is A-6 (5) and CL (clay of low plasticity) in AASHTO and Unified Soil Classification Systems, respectively. A decrease in liquid limit values of 33%, 34%, 42%, 45% and 48% with corresponding plastic limit values of 16%, 22%, 22%, 16% and 9% which produced plasticity index of 16%, 12%, 20%, 33% and 43% at 6000C, 6500C, 7000C, 8000C and 10000C RHA, temperatures were respectively recorded. The maximum dry density (MDD) and optimum moisture content (OMC) decreased with addition of the RHA. The 24-hour soaked CBR values implies, better result of 38% at 8% RHA processed at 650oC for 4 hour duration. The UCS revealed an increase in the strength from 190 kN/m2 at 0% RHA to 210 kN/m2 at 8% RHA for 28 day curing period. The results obtained suggests 8% RHA processed at 650 temperature as the as an optimum, and gives a value that satisfies road subbase material as specified in the Nigerian General Specification for Road and Bridges (1997).
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