EFFECT OF INCINERATOR ASH ON COMPACTIVE BEHAVIOUR OF LATERITIC SOIL
The effect of Incinerator Ash (IA) on compactive behavior of laterite soil was studied. The soil was classified as Aâ€“2â€“ 4(0) in accordance with American Association of State Highways and Transportation Officials (AASHTO) classification system. The natural soil has a liquid limit, plastic limit and plasticity index values of 24, 19.6 and 4.4 %, respectively. The natural soil was treated with up to 12% incinerator ash content by dry weight of soil. Specimens of treated soil were compacted with British Standard light, BSL or standard Proctor (relative compaction = 100%), West African Standard, WAS and British Standard heavy, BSH or modified Proctor. Other vital tests such as falling head permeability and California Bearing Ratio (CBR) tests were conducted as well. Results showed that properties of the modified soil improved when treated with Incinerator Ash. There was a decrease in maximum dry density (MDD), with an increase in optimum moisture content (OMC) as well as a decrease in hydraulic conductivity. No general trend was established for CBR values for WAS and BSH compactive effort. The CBR values generally decreased with BSL energy level. Statistical analysis was carried out on results obtained using analysis of variance (ANOVA) with the Microsoft Excel Analysis Tool Pak Software Package to determine the levels of significance of effect of incinerator ash on the properties of laterite soils. XLSTART 2014 statistical tool incorporated as add-in in Microsoft Excel were use for the correlation analysis. Statistical analysis shows that Incinerator ash has significant effect on the geotechnical properties of laterite soils. Based on the result obtained, an optimal blend of 2% incinerator ash content at BSH energy level optimally improved the geotechnical properties of the modified soil and is thus recommended for geotechnical engineering applications as road construction.
Authors : E. W. Gadzama, H. M. Mohammed, P. Yohanna and P. Felix
Category : Open Access Volume (Issue) : 3(1) Date Uploaded : 25th March 2018