TY - JOUR ID - 4030 TI - Study on the effect of reclaimed asphalt pavement and rejuvenator on fracture behavior of WMA JO - Amirkabir Journal of Civil Engineering JA - CEEJ LA - en SN - 2588-297X AU - Pirmohammad, Sadjad AU - Sobhi, Saeid AU - yusefi, afshar AD - Faculty member of mechanical engineering, university of Mohaghegh Ardabili, Ardabil, Iran AD - Babol Noshirvani University of Technology AD - iust Y1 - 2021 PY - 2021 VL - 53 IS - 10 SP - 4413 EP - 4432 KW - Semi-circular bending test KW - Warm mix asphalt (WMA) KW - Reclaimed Asphalt Pavement (RAP) KW - rejuvenator KW - Resistance to cracking DO - 10.22060/ceej.2020.18351.6842 N2 - Recycling or, in other words, reuse of pavement is one of the latest technologies in the field of road construction that is now more accepted than other pavement construction methods. In addition to better environmental protection, this technology results in significant cost savings. Still, one of the major concerns of its use is the creation of undesirable properties in asphalt mix, such as bitumen aging and reduced cracking resistance. The use of rejuvenation agent and WMA (warm mix asphalt) additive are the solutions to improve the performance of asphalt mixers containing RAP (reclaimed asphalt pavement) materials. Hence, in this research, in order to evaluate the effect of using RAP on the fracture resistance of WMA mixtures, the RAP materials with two dosages of 25% and 50%, one type of rejuvenation agent and Sasobit, as a WMA additive, were employed. To study the fracture resistance of the mixtures at the temperatures of -15 °C and 25 °C under mode I loading, semi-circular bending test was selected, and different fracture parameters including critical fracture load, fracture energy, flexibility index, cracking resistance index and fracture toughness were calculated. The results exhibited that the addition of RAP material to the mixture had a negative effect on the fracture parameters at different temperatures and resulted in the reduction of these parameters. While the mixtures containing rejuvenator showed more elastic behavior than those without rejuvenator. Therefore, the use of a rejuvenator led to the improvement of the fracture parameters. UR - https://ceej.aut.ac.ir/article_4030.html L1 - https://ceej.aut.ac.ir/article_4030_e34a4a862a02ffb81b41d83503eb28f0.pdf ER -