Investigating erosion resistance of expansive clay soils stabilised with brick powder waste mixed with sulphonated oil for unpaved roads

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4. Investigating erosion resistance of expansive clay soils stabilised with brick powder waste mixed with sulphonated oil for unpaved roads

Gravel roads with expansive soils have a property of swelling and shrinkage due to changes in moisture regime which reduces bearing strength. Engineers often cut and replace with a suitable material or stabilize using lime or cement. However, the cost of adding these additives has tremendously increased in the past few years; therefore, a need for a cost-effective stabilization material. Erosion resistance of expansive clay soils stabilized with Brick Powder waste mixed with Sulphonated Oil for unpaved roads was investigated. The native soil used in this study was classified as A-7-6 (clayey soil) according to ASTM D3282-93 and it was observed not to meet the performance requirements for the unpaved roads. Brick powder waste was from burnt clay bricks largely produced in Uganda mixed with the native soil in proportions between 30% and 50% at an interval of 10%. The optimum dosage with brick powder was then improved with sulphonated oil dosage levels of 0.25-1.25% at 0.25% intervals by weight. Improvements were noted in the properties of the expansive clay soil with optimum values being realized at 50% brick powder and 1% sulphonated oil by weight. The plasticity index reduced by about 35% with Maximum Dry Density (MDD) of the native sample improved by about 11.86% on addition of 50% brick powder and further improvement by about 5.46% on addition of 1.00% sulphonated oil. The OMC reduced to about 41.29% on addition of brick powder and further reduction by about 11.01% on addition of sulphonated oil. CBR value improved from 6.4% to 17.6% on addition of 50% brick powder and 1.00% sulphonated oil. The improved sample showed a UCS value of 0.53 MPa for soaked and 0.64 MPa for un soaked sample. The erosion resistance of the sample was about 70.4% of the samples stabilized with both 50% brick powder and 1.00% sulphonated oil.

9th International Congress on Environmental Geotechnics (ICEG2023)

Characterisation, Remediation and Management of Contaminated Sites and Wastes