| Abstrakt: |
The impact of rice husk ash (RHA) and Metakaolin (MTK) geopolymer in improving lateritic soil for pavement application was investigated. RHA and MTK geopolymer each was applied to a soil sample in concentrations of 0, 5, 10, 15, and 20% by dry weight of soil. Particle size distribution, Atterberg limits and compaction test are among the tests performed. Using Microsoft Office Excel software, a one-way analysis of variance (ANOVA) was performed. Results obtained, noted that with an increase in geopolymers content, a decline in the proportion of fines in the soil was recorded. The liquid limit for both treated soil declined from its natural value of 50% to a minimum of 46 and 35% at 20% geopolymer, for RHA and MTK geopolymer in that order. The plastic limit of natural soil increased somewhat from 24.37% to highest values of 31.8 and 25.7% at 20% geopolymer for both RHA and MTK geopolymer treated soil respectively. In the case of plasticity index, values generally decreased with increasing geopolymer content for both treatments. Maximum dry density (MDD) increased at first, then later declined. MDD values of 1.64, 1.76, 1.75, 1.69, 1.62 Mg/m³ and 1.62, 1.76, 1.7, 1.69, 1.71 Mg/m³ were obtained at 0, 5, 10, 15, and 20% RHA and MTK geopolymer content, respectively. Optimum moisture content (OMC) initially declined and then increased with higher geopolymer content. Analysis of variance (ANOVA) demonstrates that RHA and MTK geopolymer has a substantial influence on the treated soil. According to the findings, a 20% RHA and MTK geopolymer blend improved the soil's geotechnical qualities and is recommended for geotechnical engineering applications such as sub-base material for rural roads. [ABSTRACT FROM AUTHOR] |
