Utilization Of Construction Demolition Waste In Soil Improvement

In the cases when the engineering properties of the soils are insufficient, engineering properties can be increased by improving the soil. In the soil improvement studies, various methods such as lime, cement, fly-ash etc., are employed. The available engineering properties and the cost of improvement are important parameters in the soil improvement. In this study, it was aimed to utilise earthquake construction waste, which has become a serious environmental problem in the earthquake zones, causes visual pollution in the cities and ruins the living comfort, in soil improvement. For this purpose, the CBR values of these soils were determined by carrying out soil improvements with the construction waste of the buildings collapsed in the 1999 earthquake in Sakarya in the laboratory environment. In the study, the CBR values of 1, 7, and 28 days of these mixtures were measured by mixing the construction waste, lime and kaolin. As the sample of the soil to be improved, kaolin clay which has the highest potential to swell was used. While the lime ratio in the mixtures was selected as 0% reference, 5% and 8%, the construction waste ratio was selected between 0% reference and 23%, and kaolin was selected as 0% reference and between 72% and 100%. When 3% Construction waste, 5% Lime and 92% Kaolin were used in the mixtures, the lowest CBR values were obtained as 26.3, 28.65 and 33.13 for the first, seventh and twenty-eighth days, respectively, and when 23% construction waste, 5% lime and 72% kaolin were used, the highest CBR values were obtained as 33.52, 34.70 and 34.95, respectively