Abstract
Lateritic soil is among the major construction materials in road pavement. However, obtaining lateritic soil with sufficient strength is difficult and stabilization with cement is expensive. Stabilization with cement and lime has been well reported but there is paucity of information on stabilization with XL-Bond nanochemicals. In this study, the strength characteristics of stabilized lateritic soil with XL-Bond nanochemical were investigated. Lateritic soil samples were taken from Bariga and Mushin, Lagos State, Nigeria borrowpits (A: Latitude 6.5391°, longitude 3.3849°) and (B: Latitude 6.5273°, longitude 3.3414°), respectively. The geotechnical properties which include Moisture Content (MC), Particle Size Analysis (percentage passing sieve no 200), Plastic Index (PI), Optimum Moisture Content (OMC), Maximum Dry Density (MDD), Unconfined Compressive Strength (UCS) and California Bearing Ratio [CBR] (soaked) of lateritic soils were determined at natural state. The lateritic soils were stabilized at 2, 4, 6, and 8% of XL-Bond nanochemical by dry unit weight of the soil samples. The PI, MDD, CBR (soaked and unsoaked) and UCS of stabilized laterite soil samples were determined in line with standard methods.The MC, percentage passing sieve no 200, PI, OMC, MDD, UCS and CBR (soaked and unsoaked) of soil samples A, B were (45.6%, 38.98%, 5.0%, 10.5%, 2420 g/m3, 59kPa, 12.0% and 10.0% ); (41.1%, 54.52%, 2.0%, 12.50%, 1960g/m3, 72kPa, 4.0% and 20.0%), respectively. The PI, MDD, CBR (soaked and unsoaked) and UCS of stabilized soil with XL-Bond varied from (3-7%; 2.30-2.35g/cm3, 12-23%, 23-50% and 64-83 kPa) and (3-6%; 1.44-1.50g/cm3,6-20%, 21-40% and 79-8 kPa), respectively. There is significant effect of varying percentage of XL-Bond on CBR of stabilized samples (P = 0.1004>0.05). In conclusion, stabilization of Laterite soil with XL-Bond nanochemical enhanced its compressive strength. The stabilized lateritic soil can be used as subgrade materials in highway construction.
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