EVALUATION CRITERIA FOR HAND-GUIDED VIBRATORY ROLLERS IN COMPACTION OF LATERITES FOR ROAD MAINTENANCE WORKS’
Publication Date : 01/08/2012
This paper reports the results of an investigation aimed at evolving criteria for the use of Hand-guided vibratory rollers in the compaction of laterite for road maintenance works such as shoulder repairs and re-instatement of base course materials in failed sections. Samples of lateritic soil were collected from existing borrow pits in Tsamiya Babba and Chalawa areas of Kano State, Nigeria and classified using American Association of State Highway Officials (AASTHO) method as A-6, A-2-4 (sub-base) and A-2-6 (base) materials. Rolling tests were carried out with hand guided vibratory roller in six number bays prepared with 100 mm and 150 mm thick lateritic soil. This was to determine the economic number of passes required to achieve the maximum dry density (MDD) of the samples. It was found that for a base course, the number of passes required in compacting 100 mm and 150 mm thick layers of lateritic soil with a hand-guided rollers of weight 1015 kg were 14 and 16 respectively, while that of sub-base were 16 and 18 passes. In comparison with the rolling tests on similar materials in active earth works construction site using 10,000 kg self propelled roller, the number of passes is reduced to 4-6 and 5-8 passes for 100 mm and 150 mm base and sub base materials respectively. The number of passes required to achieve maximum dry density (MDD) depends on weight or size of compaction plant, layer thickness and material type. The hand-guided vibratory roller with 16-18 passes is recommended for maintenance work for economic base and sub-base lateritic soil material compaction.
No. of Downloads :