Stabilization of laterite soil using reclaimed asphalt pavement and sugarcane bagasse ash for pavement construction

Abstract

A laboratory study was carried out to evaluate the strength of laterite soil stabilizedwith recycled asphalt pavement (RAP) and sugarcane bagasse ash (SCBA). Thelaterite soil was mixed with RAP in 40/60 ratio and treated with SCBA at 0, 2, 4, 6, 8and 10 % by weight of the soil-RAP mixture. Particle size analysis, compaction test,unconfined compressive strength, (UCS), and California bearing ratio (CBR), testswere carried out on the prepared specimens. The results obtained show that additionof RAP reduces the optimum moisture content, (OMC), and increases the maximumdry density (MDD) of the sample as compared with the natural soil while the additionof SCBA up to 4% results in further increase in MDD; further addition of SCBAresults in reduced MDD whereas OMC increased with increasing SCBA. UCS andCBR increased with SCBA treatment and curing period respectively. Soaking of thespecimens for 24 hours results in reduced CBR values. Based on the laboratory resultsobtained and based on the strength criteria for soil-lime adopted in this study, it wasobserved that 6 to 8% SCBA treatment of the soil-RAP mixture yielded the best resultsmeeting the requirement for sub base course and 10% SCBA treatment gives the bestresults meeting the requirement for base course for light trafficked roads.