Stiffness of cold asphalt mixtures with recycled aggregates from construction and demolition waste

• Published in: Construction & building materials Vol. 77; pp. 168 - 178
• Main Authors: Gómez-Meijide, B., Pérez, I., Airey, G., Thom, N.
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 15.02.2015; Elsevier B.V
• Subjects: Aggregates (Building materials); Analysis; Bituminous materials; Cold asphalt mixture; Construction and demolition waste; Dynamic modulus; Master curves; Mechanical properties; Stiffness; Spain; Cold asphalt mixture; NA; CDWA; ITSM; Construction and demolition waste; Dynamic modulus; Stiffness; HMA; Master curves; CAM
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2014.12.045

•The stiffness of cold asphalt mixtures (CAM) containing CDW as aggregate were studied.•CAMs with CDWA frequently achieved higher stiffness than control mixes.•CAMs with CDWA were less temperature susceptible and more fatigue resistant.•CAMs with CDWA were more complicated to design.•Clear dependency of stiffness on the compaction process (static and gyratory). The stiffness of cold asphalt mixtures (CAM) with 100% recycled construction and demolition waste aggregates (CDWA) was studied from three different points of view: the indirect tensile stiffness modulus (ITSM), the dynamic modulus at different temperatures and frequencies and the correlation between them. It was found that CAM with CDWA frequently achieved higher stiffness than control mixes using natural aggregate (NA), but that they required significantly higher bitumen and water contents. They were less temperature susceptible, therefore potentially more fatigue resistant, but more complicated to design. Finally, a clear dependency on the compaction process (static and gyratory) was also found.