Print Email Facebook Twitter Thermal aging behaviors of the waste tire rubber used in bitumen modification Title Thermal aging behaviors of the waste tire rubber used in bitumen modification Author Wang, H. (TU Delft Pavement Engineering; The Hong Kong Polytechnic University) Liu, X. (TU Delft Pavement Engineering) Varveri, Aikaterini (TU Delft Pavement Engineering) Zhang, H. (TU Delft Materials and Environment; Shandong University) Erkens, S. (TU Delft Pavement Engineering) Scarpas, Athanasios (TU Delft Pavement Engineering; Khalifa University of Science and Technology) Leng, Zhen (The Hong Kong Polytechnic University) Date 2021 Abstract Considering the application scenarios of rubber granules from waste tires in the bitumen modification process (wet or dry process), both aerobic and anaerobic aging of rubber may occur. The current study aims to investigate the thermal aging behavior of waste tire rubber samples using nanoindentation and environment scanning electron microscopy (ESEM) tests. Both aerobic and anaerobic aging tests with different durations were conducted on rubber samples. The complex moduli of aged rubber samples were measured by nanoindentation tests. The surface morphology and elemental composition of aged samples were obtained by ESEM tests together with the energy dispersive X-ray analysis. Results have shown that for both aerobic and anaerobic aging, the equilibrium modulus derived from the complex modulus curve first increases and then decreases with aging time. However, the time needed for the aerobically aged sample to reach the maximum equilibrium modulus is shorter than the anaerobic case. Aging results in crack propagation and an increase of sulfur content on the rubber surface until it reaches the peak. The degree of crosslinking reflected by sulfur content for anaerobic aging is higher than aerobic aging. The morphological change and elemental change of rubber correlate well with the change of mechanical properties. The aging of rubber from the waste truck tire at 180°C can generally be separated into two stages: crosslinking dominant stage and chain scission dominant stage. Subject EDXESEMnanoindentationthermal agingviscoelasticityWaste tire rubber To reference this document use: http://resolver.tudelft.nl/uuid:03087d00-59e0-42b2-8ff3-32047feb5c89 DOI https://doi.org/10.1177/14777606211038951 ISSN 1477-7606 Source Progress in Rubber, Plastics and Recycling Technology, 38 (1), 56-69 Part of collection Institutional Repository Document type journal article Rights © 2021 H. Wang, X. Liu, Aikaterini Varveri, H. Zhang, S. Erkens, Athanasios Scarpas, Zhen Leng Files PDF 14777606211038951.pdf 2.33 MB Close viewer /islandora/object/uuid:03087d00-59e0-42b2-8ff3-32047feb5c89/datastream/OBJ/view