Mechanical Characterization of Lateritic Soil Stabilized with Recycled Asphaltic Materials for Road Construction
1Ibitoye B.A., *1Onadiran S.O., Subair S. O., Hassan D. E., Fakorede V., Ige J. A.
1Department of Civil Engineering, LAUTECH, Ogbomoso, Oyo State, Nigeria.
2Department of Civil Engineering, Kwara State University, Malete Kwara State Nigeria
DOI: 10.36108/laujoces/6202.61.0261
Abstract
Pavement recycling is an effective practical process to conserve the diminishing supply of construction material and to help reduce the cost of preserving the existing pavement network in the country. In the U.S. the asphalt pavement industry recycles roughly 73 million tons of material yearly. This research study addresses the effect of grinding and blending recycled asphaltic materials (RAM) with Virgin aggregate in order to yield a base/sub-base material to be used in pavement construction in Nigeria. It also aims at finding the optimum RAM percentage to be added to a virgin aggregate in order to produce a base or sub-base quality and material with cheaper cost without affecting the pavement performance. In this research study. two types of pavement materials were investigated. The first material is a lateritic soil (Control) extracted from a site. The second material is a recycled asphaltic material {RAM} collected from an old pavement. A total of five different mixtures were prepared using different percentages of the two material types. This research showed that. based on the CBR strength testing results, aggregate blends containing RAM and lateritic soil are only suitable to function as a sub-base and base course material at 90:10 to 75:25 respectively, as sub-base and base course material with the RAM acting as a stabilizer, continuous adding of RAM to the laterite increases the maximum dry density thereby reducing the optimum moisture content, the plasticity and liquid limit also reduces as more RAM were added to the mixture.
Keywords: Pavement Recycling, Recycled Asphaltic Materials (RAM), Base/Sub-base Material, Lateritic Soil, California Bearing Ratio (CBR), Pavement Performance.