Large Scale Laboratory Investigation in the Improvement of Subgrade Characteristics of Clay Soil Stabilized with Construction Demolition Waste

Abstract

In this study, the changes in the bearing capacity-settlement behavior were investigated by model experiments before and after the improvement of clay with construction demolishing waste (CDW). Clay has been accepted as the natural soil sample and CDW at various ratios have been used in order to prepare mixtures. The compaction and unconfined compression test have been carried out on prepared samples. As a result of classical civil engineering experiments, the optimum CDW mixing ratio in clay was determined as 14%. Laboratory model tests were performed on the fillings of different thicknesses consisting of clay and CDW mixture formed in optimum mixing ratio, in order to investigate the effect of the change of fill thickness. Experiments were carried out at the end of 1 day, 5 days, 15 days and 30 days in order to determine the changes in the bearing capacity of the fillings formed at optimum layer thickness. According to the results, it was determined that CDW can be used at soil improvement. Furthermore, if this soils are improved, it is sufficient to select a layer thickness as deep as 1.5 times the footing diameter.