Transport and Communications Science Journal, Vol 72, Issue 8 (10/2021), 920-931 920 Transport and Communications Science Journal THE EFFECT OF AGING ON THE CRACKING RESISTANCE OF WARM MIX ASPHALT WITH HIGH RAP CONTENT Nguyen Ngoc Lan, Truong Van Quyet * University of Transport and Communications, No 3 Cau Giay Street, Hanoi, Vietnam. ARTICLE INFO TYPE: Research Article Received: 27/08/2021 Revised: 28/09/2021 Accepted: 06/10/2021 Published online: 15/10/2021 https://doi.org/10.47869/tcsj.72.8.6 * Corresponding author Email: quyet.tv@utc.edu.vn; Tel: +84978452140 Abstract. Asphalt mixtures containing Reclaimed Asphalt Pavement (RAP) have high stiffness due to the aged binder in these recycled materials. The evaluation of the cracking resistance of the asphalt mixture containing RAP is therefore a priority for the asphalt materials, especially with high RAP content. In addition, aging in asphalt binders is recognized as one of the factors causing cracking-related failures. Asphalt aging occurs during the production, construction, and service life of the pavements. Therefore, the evaluation of asphalt mixtures’ cracking resistance is one of the critical items to assess the quality and durability of the pavements during the exploitation period. This paper presents the results of the evaluation of cracking resistance of warm mix asphalt with RAP contents of 30% and 50% under the different aging conditions. The IDEAL-CT determines cracking resistance through a fracture mechanics-based parameter Cracking Tolerance Index (CTIndex). Three aging conditions were performed including the loose mixture including short-term oven aging at 135 o C for 4 hours, long-term oven aging at 135 o C for 24 hours, and long-term oven aging at 95 o C for 8 days after short-term oven aging. Laboratory test results of the CTIndex indicated the influence of different aging conditions on the cracking resistance of warm mix asphalt with high RAP content. Keywords: Warm mix asphalt, Reclaimed asphalt pavement, Recycled asphalt, Aging, Cracking resistance, Cracking Tolerance Index (CTIndex) 2021 University of Transport and Communications