Investigation on the variation of strength of coarse grained soils reinforced with waste tires pieces as a result of freezing and thawing cycles

In regions where climatic differences frequently are affects especially engineering structures under different loads. this effect is being studied to reduce the participation of various waste materials in coarse grained soil. in this study, the changes in strength of coarse grained soil (cg) reinforced with scrap tire pieces (st) was investigated under freezing- thawing conditions. experiments were conducted on coarse grained samples prepared by compression under standard proctor energy. unconfined compressive strength values of coarse grained soil sample with 0.5%,1% and 2% addition of scrap tires were determined at studied temperature (+21 oc) on days 1, 7 and 28. the highest increase rate of strength was 8.62% in cg+0.5% st (1.18 𝑚𝑚) mixture, %16.92 in cg+1% st (2.00 𝑚𝑚) mixture and %9.54 in cg+%1 st (3.15 𝑚𝑚) mixture. the freeze-thaw test was applied on this mixture. the results showed that while the strength rate of cg+0.5% st (1.18 𝑚𝑚) and cg+1% st (3.15 𝑚𝑚) mixtures decreased to 28.05% and 13.33%, respectively; the strength of cg+1% st (2.00 𝑚𝑚) mixture increased to 5.61%.