Effect of Mixture of Cement Dust and Glass Sand on engineering properties of Expansive Soils under Pavement.

Expansive soils represent one of the problematic soils that exhibit high volume change during wetting and drying due to swell- shrink behavior caused a significant problems for structures constructed over them. Numerous materials and methods have been used to improve expansive soil properties to make them more suitable for engineering construction purposes. The natural materials represent more economical materials for this purpose beside the developing and exploiting the minerals ores in the Iraqi lands. The western desert of Iraq is considered as a large rich desert, it riches with many mineral ores. In this research, the ability of using mixture of cement dust which is a waste from Portland cement manufacturing as a primary material and glass sand which is one of the available minerals at the western desert of Iraq as a secondary material for improving the engineering properties of expansive soil under pavement was studied. Results show that adding the mixture of 8% cement dust with 4% glass sand increase the CBR value and improve the swelling behavior of soil. The addition of the mixture of cement dust- glass sand decrease the maximum dry density and increase the optimum moisture content. [ABSTRACT FROM AUTHOR]