The freezing-thawing behavior of clayey soils reinforced with scrap tires pieces

Seasonal freeze-thaw adversely affects especially engineering structures (highway, railway, pipe line, drainage channel) under different loads. This effect is being studied to reduce the participation of various waste materials in fine grained soil. In this study, the changes in strength of clayey soil reinforced with scrap tire pieces was investigated under freezing-thawing conditions. Experiments were conducted on clay samples prepared by compression under standard proctor energy. Unconfined compressive strenth values of clayey soil sample with 0.5%, 1% and 2% addition of scrap tires were determined at studied temperature (+21 °C) on days 0, 1, 7 and 28. The unconfined compressive strength values of clay sample reinforced by the addition of 0.5% scrap tires increased after 28 days. After 28 day cure on sample (+21 °C,-21 °C) and 12 cycles of freezing-thawing experiments were performed. The results showed that 32.9% of unconfined compressive strength ratio of clay sample reinforced with scrap tire pieces decreased while the mass loss was determined to be 13.7%.

Atýk lastik parçalarý ile güçlendirilmiþ killi zeminlerin donma-çözülme davranýþý

Mevsimsel donma-çözülme özellikle mühendislik yapýlarýný (karayolu, demiryolu, boru hattý, drenaj kanalý gibi) farklý yükler altýnda olumsuz etkilemektedir. Bu etkinin ince taneli zeminlerde çeþitli atýk malzemeler katýlýmýyla azaltýlmasý yönünde çalýþmalar yapýlmaktadýr. Bu çalýþma da atýk olan lastik parçalarýyla güçlendirilmiþ killi zeminin donma-çözülme sonucu mukavemetlerindeki deðiþimi incelenmiþtir. Deneyler standart proktor enerjisi altýnda sýkýþtýrýlmasý ile hazýrlanan kil numuneler üzerinde yürütülmüþtür. Bu killi zemin örneðine %0.5, %1 ve %2 atýk lastik (AL) ilavesi yapýlarak 0, 1, 7 ve 28 günlük çalýþma odasý sýcaklýðýndaki (+21 °C) kür sonucu, serbest basýnç mukavemetleri belirlenmiþtir. Bu deðerlerden 28 günlük kür ve %0.5 AL katkýsýyla güçlendirilen kil zeminin serbest basýnç mukavemetini %35.3 artýrmýþtýr. 28 günlük kür sonucu elde edilen bu örneklere (-21 °C, +21 °C) ve 12 çevrim olarak donma-çözülme deneyi uygulanmýþtýr. Elde edilen verilerden atýk lastik ile güçlendirilen kil zeminin serbest basýnç mukavemeti %32.9 oranýnda azaldýðý, kütle kayýplarýnýn ise %13.7 olduðu belirlenmiþtir.