ABSTRACT
Taken the environment into consideration, in geotechnical engineering waste materials are tested to prove their compatibility for soil improvement. One such product is fly ash, being waste of the coal burning process. Fine-grained soils enhanced with fly ash have shown to have better strength and deformation properties, as well as benefits as fill material. However, the properties of sandy soil mixtures have not been extensively investigated. Therefore, research has been started by determining the chemical properties of the fly ash samples, followed by specialized tests in the field of soil mechanics, on samples of fly ash and Skopje sand, in order to identify the benefits of such mixtures. This paper has the purpose to present the obtained results from monotonic triaxial tests on Skopje Sand – fly ash mixtures with different percentage of fly ash, namely 5, 10 and 20%, tested under effective stress of 100 kPa.
