Lateritic Soil Stabilized with Bottom Ash Geopolymers for road work
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Abstract
The objective of this research is to study the unconfined compressive strength of lateritic soil stabilized with bottom ash geopolymer. Lateritic soil (LS) was mixed with ground bottom ash (BA) passing no. 325 sieve at LS:BA ratios of 70:30, 50:50, and 30:70. A liquid alkali activator was used instead of water, which was a mixture of sodium silicate (Na2SiO3) solution and sodium hydroxide (NaOH) solution at Na2SiO3:NaOH ratios of 0:100, 10:90, 30:70, and 50:50. The quantities of the liquid alkali activator used in specimen preparations by compacting were optimum moisture content (OMC), OMC minus 2% (dry side), and OMC plus 2% (wet side). After sample preparations, they were cured in oven at 65 °C for 7 days. Then, the samples were taken to soak for 2 hours prior to testing. The results reveal the best proportion of LS:BA was 30:70 and the best Na2SiO3:NaOH ratio was 50:50. The recommended proportions of LS:BA and Na2SiO3:NaOH for road work were, 50:50 and 10:90, respectively.
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