Strength And Compaction Characteristics Of Bitumen-Stabilized Granular Soil
Olumide Moses Ogundipe
Index Terms— Stabilization, Granular soil, Bitumen, Maximum dry density, Optimum moisture content, California bearing ratio.
Abstract— This study investigates the stabilization of granular soil with bitumen. The strength and compaction characteristics of the natural and stabilized granular soil were determined. In the study, 2%, 4% and 6% bitumen content were considered. The results showed that the optimum binder content required in achieving the highest maximum dry density (MDD) and California bearing ratio (CBR) is 4%. It was discovered that when 6% bitumen was used, the MDD and the CBR decreased, although the values obtained were greater than those for unstabilized granular soil. The reduction in the MDD and CBR is probably due to the excess bitumen in the mix which filled the voids, thus resulting in slip and weakening the bond between the aggregates. Also, the relationship between the optimum moisture content and the bitumen content showed that the moisture content in the soil must be considered in the selection of the binder content that will give the best results. Generally, it was found that the properties of the granular soil improved when stabilized with cutback bitumen.
 Harris, V. A. P., Hitch L.S. and J.M. Jowett, Bituminous stabilization of fine sands: construction of the Baiomori-Gashua road, Nigeria. Proc. Institution of Civil Engineers Part 1, 74 (1983), 270-300.
 USACE, Stabilization with Bitumen. United States Army Corps of Engineers. EM 1110-3-137, 1984.
 Bissada A.F, Structural Response of Foamed-Asphalt-Sand Mixtures in Hot Environments. Transportation Research Record 1115, 1999.
 Aiban S.A., A study of Sand Stabilization in Eastern Saudi Arabia. Engineering Geology, 38 (1994), 65-79.
 Huan Y., Siripun K., Jitsangiam P. and H. Nikraz, A preliminary study on foamed bitumen stabilisation for Western Australian pavements. Scientific Research and Essays 5(23), (2010) 3687-3700.
 BS 1377, Method of Test for Soils for Civil Engineering Purposes, British Standard Institution, London, 1990.
 O’Flaherty C.A,, Highways: The Location, Design, Construction and Maintenance of Pavements. 4th Edition, Butterworth-Heinemann, Oxford, United Kingdom, 2002.