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A laboratory study on the influence of modified proctor (MP) and standard proctor (SP) compactive effort on expansive black cotton soil (BCS) specimens treated with up to 8% ordinary Portland cement (OPC) admixed with up to 20% waste glass (WG) by dry weight of soil were undertaken. The soil was classified as A-75(13) and CH according to the American Association of State Highway and Transport Officials (AASHTO) and the Unified Soil Classification System (USCS) Classifications. Chemical analysis revealed that WG is rich in main oxides such as Silicon Oxide (69.2%), Aluminium Oxide (2.29%), Iron Oxide (1.57%), Calcium Oxide (15.1%) and Sodium Oxide (8.75%). The soil was stabilized with 0, 2, 4, 6 and 8% cement and 0, 5 10, 15 and 20% WG by weight of the dry soil. The results obtained showed an increase in maximum dry density (MDD) with increase in WG content in all cement proportions used and as compared to the values obtained for the natural soil. The tests showed significant effects of the additives. The peak 7 days unconfined compressive strength (UCS) values of 1152 kN/m 2 and 1568 kN/m 2 were obtained at 8% OPC / 20% WG treatment for the SP and MP compactive efforts, respectively. These values are lower than the 1720 kN/m 2 recommended by Transport and Road Research Laboratory (TRRL) (1977) for adequate cement stabilization. The SP and MP compactive efforts at 28 days yielded UCS values of 1857 kN/m 2 and 2005 kN/m 2 which justified the slow pozzolanic reaction of WG when compared with cement hydration. CBR values were lower than the 180% criterion recommended by the Nigerian General Specifications (1997) for cement stabilized soil, however, specimens treated with 8% OPC/ (5-20%) WG and compacted at both energy levels met the requirement of 30% CBR specified by the Nigerian General Specification (1997) for sub-base in roads. Maximum improvement in CBR values of 55% and 65% for the entire blend was archived at 8% OPC/20%WG blend.

Influence of Standard and Modified Proctor Compactive Efforts on Cement Stabilized Black Cotton Soil (BCS) with Waste Glass (WG)Admixture