Author(s) :

ADEDOKUN, T.A., DANDELA, S..

Volume/Issue :

Abstract :

Two samples from common existing borrow pits were taken, classified as A-2-6 types of lateritic soils using the AASHTO soil classification method, having group index(GI) of zero (0) which were described as good granular soils, suitable for sub base and sub grade materials. The effect of compaction delay between period zero to three hours in an interval of 30 minutes, for the two samples with addition of cement 1, 2, 3, 4, 5 and 6% for both samples “A” and “B” have been established. For both samples, the Maximum Dry Density is at Optimum (1.956Mg/m3 at 1.5 hour delay for sample A and 1.840 Mg/m3 at 0.5 hour delay for sample B) with 1% Cement content and the more the compaction delay, the lower the maximum dry density (MDD) values obtained. The California bearing ratio (CBR) is at optimum (46% at 1.5 hour delay for sample A and 63% at 2.0 hour delay for sample B) with 6% cement content for both samples. CBR values for sample “A” continues to increase with time delay up to 1.5 hours, while CBR values for sample “B” continues to increase with time delay up to 2.0 hours. For fine materials, higher fine (300μm) material with lower cement content (1 and 2%) produced optimum CBR values (30% at 0.0 hour delay for sample A and 32% at 0.0 hour delay for sample B). 6% cement content is recommended for both samples for Optimum values of CBR and UCS, while 1% cement content is recommended for MDD for both samples.

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