Comparison between Effect of Lime and Rice Husk Ash on California Bearing Ratio on Soil in Changkat Chermin

Subgrade that contained substantial amount of clay minerals has low strength and
cannot be guaranteed under load, especially in presence of water. Nonnally the soil
would be removed and replaced by granular material or adding stabilizer to increase
the CBR value. Instead of replacing the soil with granular material, soil stabilization
can be adapted. The process of soil stabilization can be done by mixing soil and an
additive with the existence of water. Cement and lime were common additives being
used. However, this study was conducted to compare the effect of Rice Husk Ash
(RHA) and Lime on California Bearing Ratio (CBR) of soil in Changkat Cermin.
Rice Husk Ash is a good pozzolanic material from by product of paddy. 12% to
42% of RHA and 2% to 6% of lime had been used in order to achieve the objective
of this research. Compaction test was carried out in order to determine the value
maximum dry density (MDD) and optimum moisture content (OMC) which be used
for conducting CBR test. CBR test had been conducted for unsoaked, soaked and 24
hour curing. For soaked condition, swell pressure value were recorded to compare
the effect of RHA and lime on swell improvement. There was an improvement in
CBR value with increase in RHA with peak values between 18-42% RHA contents.
Meanwhile for lime, the CBR increase with maximum value between 2.5 to 4% of
lime. The minimum swelling reading was at 35% of RHA and 2.5% of Lime. Soil
Stabilization by using RHA is not cost effective since RHA more costly than lime.
However, RHA can be used as alternative additive for soil stabilization since it can
increase the CBR value of the soil.