z. mehrmousavi

In most civil projects، such as irrigation and drainage networks constructions، soil stabilization has an important role. Achieving maximum durability against wet-dry cycles is one of the soil stabilization objects. Therefore، depend upon project type and its importance; various hydraulic binders with different amounts are tested to obtain desirable results from technical and economical view. In this research، the effect of dry-wet cycles on engineering properties of clayey soils (low plasticity) was studied and lime، cement and lime-cement binders، with (2-6) percent of soil weight، were used. The results showed that with changing type and percent of binders، various sample durability against dry-wet cycles is different so that without binder samples did not have durability and the samples stabilized by 4% cement and 4% lime tolerance 12 wet-dry cycles. The results also showed that after dry-wet cycles، the mass and volume of sample were changed and its unconfined compressive strength was decreased so that the decrease of the unconfined compressive strength was between 40% and 60%. The present study showed that dry-wet cycles significantly cause to change the soil geotechnical properties.