Influence of Fly ash, Lime, Fines Obtained From Demolished Structures Waste On Geotechnical and Strength Characteristics of Soil

Construction and demolished (C&D) waste which produced continuously during the construction work can be used for this purpose. The disposal of such material has become a big issue because this kind of deposit covers huge landfill area. In present study, the effect of fines obtained from construction and demolished (C&D) waste and fly ash in the soil mixture was evaluated. Fly ash content as 5, 10 and 15%, C&D waste as 6, 10 and 14% and lime as 2, 4 and 6%. The study results reveal that due to the addition of admixtures, Specific gravity, Maximum dry density (MDD) increases and plasticity index (PI) and optimum moisture content (OMC) decreases. On the other hand specific gravity, PI, MDD decreases and OMC increases with the addition of FA and lime. But the effect of fly ash on unconfined compressive strength value of soil at 7 and 14 days are least as compared to the lime and construction and demolished (C&D) waste. The result of split tensile strength (STS) value of soil after treatment with different admixtures at variable percentage and at different curing periods of 7 and 14 days shows that the maximum gain in strength is due to the addition of 6% lime.