This study investigates the possibility of using the industrial waste material of Al-sugar factory to improve the engineering properties of Gypseous Soil which taken from Baiji area. This soil can be classified as a silty soil with low plasticity and high gypsum content (35% gypsum). The investigated soil was treated with industrial waste (most of its composition is hydrated lime) using (1,3, 5 and 7 %) by dry weight of the soil. The results indicated that the engineering properties improved considerably.
The soil become non-plastic if (5%) of waste is used. The industrial waste increases the unconfined compressive strength and the effective shear strength parameters (angle of internal friction ( ) and cohesion (c`)).
The results of consolidation test showed that the compression Index (cc) and coefficient of consolidation (cv) decreased when the soil was treated with industrial waste. It also has this waste to reduce the effect of leaching process on the compressibility and permeability of the soil.
Accordingly, the industrial wastes may be considered as an advantageous in effect to the engineering characteristics of gypseous soil.