Using a Laboratory Model Test to Evaluate Collapsibility of Gypseous Soils Improved by Sludge

Collapsibility of gypseous soils may cause excessive settlement and severe damage to engineering structures. Many improvement methods have been employed reduce the collapsibility these soils, such as by using physical or chemical additives. The improved has conventionally evaluated odometer test, which not accurately replicate field conditions because small size test specimens. In this research, a laboratory model 600x600x600 mm with footing 100x100mm was developed measure collapse characteristics sandy soil gypsum content 37%. first conducted on specimens in at three different relative densities. then performed after compacting top layer [thickness from 50 100 mm] maximum dry density, obtained Standard Compaction Test. Water treatment sludge also used further improve compacted layer. results indicated that reduction factor 75% when thickness density. Additionally, layer, 86%.