EFFECTS OF COMPACTION DELAY ON STRENGTH OF CEMENT STABILIZED LATERITIC SOILS
2nd Biennial Conference
Authors
Abstract
Most laterite requires some forms of stabilization before been effectively used in road construction to improve
the bearing capacity. However, due to shortage of machine parts, machine breakdown,, negligence of workers
and company policy, the laterite might not be compacted immediately. Three laterite samples were collected from
three different pits to investigate the effect of compaction delay on cement stabilized lateritic soil. The samples
were subjected to laboratory tests; (all tests were carried out at the Geotechnic Lab. Ladoke Akintola University
of Technology, Ogbomoso) Grain Size Analysis, Natural Moisture Contents, Atterberg Limit Tests (liquid limit
and plastic limit), Specific Gravity, British Proctor Compaction test, California Bearing Ratio and Unconfined
Compressive Test .Deduction from laboratory tests revealed that sample A, B and C are A – 2 – 6 (0), A – 2 –6
(0) and A – 7 – 6 (0) respectively. The A and B soils were stabilized with 3%, 4% and 6% cement of dry mass of
soil sample while sample C soil was stabilized with 6%, 8% and 10% cement of dry mass of soil sample. The
stabilized samples were delayed for 1, 2 and 3 hours before compaction. The Calofornia Bearing Ratio soaked
test showed a strength reduction of between 4.16% and 12.1% for an hour delay for the A and B soil, while it was
4.3% to 21.4% for the C soil. The CBR unsoaked for soil sample C had the least drop of 2.5%, 5.5% and 12.6%
for 1, 2 and 3 hours delay period respectively, while samples A and B had maximum decrease of 6.49%, 13.74%
and 23.86% for similar delayed periods. The unconfined compressive strength showed that the highest strength
decrease for A and B Soils ranges between 14.9% and 38.7%, while that of C soil is 38.63% for three hours delay
period. Delay in compaction reduces the strength of different samples of stabilized lateritic soils.
Keywords
Stabilized, lateritic soil, California bearing ratio, compaction delay, moisture content
Download PDF