Polietilen ve kalsiyum karbonat bileþiði modifiyeli bitümlü baðlayýcýlarýn sýcaklýk duyarlýlýðý ve depolama stabilitesinin incelenmesi

Bu çalýþmada, polietilen ve kalsiyum karnonat bileþiði (PEC) modifiyeli bitümünün sýcaklýk duyarlýlýðý ve depolama stabilitesi incelenmiþtir. PEC bitüm aðýrlýðýnca %3, %6, %9, %12 ve %15 oranlarýnda kullanýlmýþtýr. PEC modifiyeli baðlayýcýlarýn özellikleri, %4 styrene-butadiene-styrene (SBS) modifiyeli baðlayýcý ile kýyaslanmýþtýr. Baðlayýcýlarýn sýcaklýk hassasiyetini belirlemek için penetrasyon, yumuþama noktasý ve dönel viskozimetre deneyleri uygulanmýþtýr. Baðlayýcýlara depolama sonrasý yumuþama noktasý ve dinamik kayma reometresi deneyleri uygulanmýþtýr. Ayrýca baðlayýcýlarýn yaklaþýk maliyetleri yardýmýyla performans / maliyet iliþkisi belirlenmiþtir. Deney sonuçlarýna göre; %15 PEC içeren baðlayýcý düþük sýcaklýk hassasiyeti ile ön plana çýkmýþtýr. PEC modifiyeli baðlayýcýlarda %6’dan daha fazla katký içeriðinde depolama sonrasý önemli derecede faz ayrýmý olduðu belirlenmiþtir. Baðlayýcýlarýn performans ve maliyetleri birlikte deðerlendirildiðinde %6 PEC içeren baðlayýcýnýn %4 SBS modifikasyonu ile sýcaklýk hassasiyeti, depolama stabilitesi ve ekonomik bakýmdan benzer performansa sahip olduðu tespit edilmiþtir.

Investigation of temperature sensitivity and storage stability of polyethylene and calcium carbonate compound modified bituminous binders

In this study, temperature sensitivity and storage stability of polyethylene and calcium carnonate compound (PEC) modified bitumen were investigated. PEC was used at the rates of 3%, 6%, 9%, 12% and 15% by weight of bitumen. The characteristics of PEC additived binders were confronted with 4% styrene-butadiene-styrene (SBS) additived binder. Penetration, rotational viscometer and softening point experiments were applied to determine the temperature sensitivity of the binders. After the storage process, dynamic shear rheometry and softening point experiments were applied to the binders. Moreover, their performance / cost relations were determined with the help of the approximate costs of the binders. According to the test results; The binder containing 15% PEC stands out with its low temperature sensitivity It has been appeared that there was a important phase separation after storage with an additive content of more than 6% in PEC modified binders. When the performance and costs of the binders are evaluated together, it has been determined that the binder containing 6% PEC has similar performance with 4% SBS modification in terms of temperature sensitivity, storage stability and economy.