Taysan soil mix with calaca bottom ash as an alternative road base material

The focused of the study is to determine the viability of Taysan Soil mixed with Calacabottom ash (CBA) as an alternative road base material. The study also aimed to determine the varying proportions of each sample and select the best proportion that would serve as the basis for the road base material. Findings showed that the soil sample has a moisture content of 7.32%. While the soil sample obtained of a plastic limit of 16.54%, a liquid limit of 22.58% and aplasticity index of 6.04%. The liquid limit did not exceed 25% and the plasticity index attained the 6% requirement of the DPWH Standard Specification. Based on the result of particle size the soil sample is composed mostly of gravel according to the USCS and AASHTO having a percentage of 76.387% and 87.723% respectively. However the soil sample attained a CBR value of 89% at 100% dry density and 73% at 95% dry density. The California Bearing Ratio (CBR) value of the Taysan soil is greater than 80% as required by the DPWH standard specification. Furthermore, moisture content of 15.42% and CBA is a non – plastic material. In terms of particle size based on CBA sample according to AASHTO is consists of 52.23% of gravel, 41.56% of sand and 6.21% of clay while according to the USCS, it consists of 32.30% of gravel, 61.49% of sand and 6.21% of clay. The CBR values of the Taysan soil with CBA increases as the percentage of CBA increases.