The Effect of Adding a Gypsum-CKD Mixture on some Physical and Chemical Properties of Sand Dunes

Abstract

Cement kiln dust and gypsum, and to assess the suitability of this mixture as a 1 cm thick layer on a dense surface in resisting external conditions and air pressure, experimental programs were conducted in the laboratory. The results indicated that cement kiln dust contributed to improving the cohesion of the sand dunes and reducing their percentage. It also increased the porosity to reach 57.5%, along with a decrease in the values of water conductivity and permeability compared to untreated soil. Furthermore, the pH and EC values showed a noticeable decrease over a period of fourteen months. On the other hand, an experiment was conducted to wash the cement kiln dust and evaluate its effect on EC values. It was found that the cement kiln dust contained easily washable salts when the washing process was repeated seven times consecutively over seven days.