Effects of freeze-thaw on dynamic mechanical behavior of cement emulsified asphalt composite binder

• Published in: Construction & building materials 2019-07, Vol.213, p.608-616
• Main Authors: Li, Yunliang, He, Xin, Sun, Haijiao, Tan, Yiqiu
• Format: Article
• Language: English
• Subjects: Cement emulsified asphalt composite binder; Complex modulus; Constitutive equation; Freeze-thaw; Viscoelasticity
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.04.050

•Cement emulsified asphalt composite binder (simplified as CEACB).•Viscoelastic mechanical model of CEACB is established.•Constitutive equation parameters change with freeze-thaw cycles.•Pore content of CEACB increases with the increase of freeze-thaw cycles. Cement emulsified asphalt composite binder (simplified as CEACB) is a type of composite binder existed in cement and asphalt mortar (simplified as CA mortar). The effects of freeze-thaw cycles on the dynamic mechanical properties of CEACB were analyzed based on viscoelastic mechanical model and dynamic frequency scanning test. The effects of freeze-thaw cycles, temperatures and mix proportions on the viscoelastic behavior of CEACB were analyzed. This study demonstrates that, as freeze-thaw cycles increasing, constitutive equation parameters E1 and η1 decrease, and r tends to increase. The ability of CEACB to resist elastic deformation and viscous flow is reduced, and CEACB shows a tendency of softening. With asphalt to cement ratio (A/C) increasing and temperature rising, both E1 and η1 decrease, while r increases, and CEACB tends to be like viscous material. As freeze-thaw cycles increasing, the pore content of CEACB increases. Freeze-thaw causes obvious structural damage and viscoelastic mechanical properties of CEACB were changed.