Influences of Fly-Ash and Eggshell Powder on Some of Engineering Properties of Al-Umara Soil

Abstract

The purpose of this study was to investigate the influences of adding each fly-ash and eggshell powder on the Atterberg Limits, Cohesion, and Angle of Internal Friction of the tested soil. The tested soil is (CL) group according to the unified soil classification system obtained from a site located near Al-Sader Teaching Hospital in Al-Umara City. Each fly-ash and eggshell powder was added to the soil samples in (2, 4, 8, 12, 16, 20 & 24 %) by weight of samples. The study shows that as the percentages of adding fly–ash and eggshell powder increases, the reduction in the plasticity index amount for all soil samples increases too at different rates. The values of cohesion decreased when the soil samples were mixed with fly-ash, while there was an increase in the values of internal angle of friction. In the case of using eggshell powder, there was a small increase in cohesion values, but there was a small decrease in the internal angle of friction values for the tested soil.