Improvement of swelling clay properties using hay fibers

► Swelling clay is mixed with hay fibers to improve its characteristics. ► The shrinkage limit decreases with the increasing of hay ratio till 1% hay ratio. ► The unconfined compression strength decreases with the increasing of hay ratio. ► The tensile strength of the air dried hay-clay mixture increases by 30% with hay ratio addition of 1% by weight. ► The swelling potential decreases by 20% with hay ratio equal to 1%.