Stabilization of Lateritic Soil for Unpaved Roads Using Molasses in Butere-mumias District, Kenya

Abstract

This research examined the mechanism of Stabilization of Lateritic Soil with Cane Molasses. The main objective of the study was to establish whether or not sugar cane molasses can be used as a stabilizing agent on the wearing course on unpaved roads. Other objectives were; to carry out strength assessment of neat lateritic soil and lateritic soil mixed with cane molasses as reflected by California Bearing Ratio [CBR] and to determine the optimum mix ratio of molasses to lateritic gravel required for stabilization. Cane molasses was selected for this purpose because it contained some elements/compounds which are known to react with lateritic soil and change characteristics of the soil. Quantities of molasses in the ratios of 1%, 2%, 3% and 4% were mixed with pre-determined ratios of soil samples and tests done on mixed samples. From the sample chosen along the Bukura-Shibuli road, the tests carried out included Particle Size Distribution, Atterberg Limits, Proctor Compaction, Unconfined Compressive Strength (UCS) and California Bearing Ratio (CBR).   It was established that 2% cane molasses by weight of dry soil was the optimum for effective stabilization of lateritic soil. The conclusion was that the increase in CBR values for lateritic soil mixed with cane molasses above those of neat lateritic soil was an indication that cane molasses caused the increase in soil strength. Therefore, Industrial wastes like molasses have significant potential and should be used in place of conventional material for gravel wearing course constructions and should be projected for future construction.