A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Effect of RAP on Cracking and Rutting Resistance of HMA Mixes
The use of recycled asphalt pavement (RAP) has significantly increased in construction and rehabilitation of flexible pavements to ensure proper utilization of limited natural resources and for environmental benefits. Performance measures of asphalt pavement like cracking and rutting resistance under repetitive traffic and environment induced load are important criteria to assess the viability of the use of RAP in hot-mix asphalt (HMA). This research was conducted to evaluate the effect of RAP on cracking and rutting resistance of HMA mixes. Three different mixtures, Control (0% RAP), 20% RAP, and 24% RAP mixtures were considered for the study. Nominal maximum aggregate size (NMAS) used for all mixes was 12.5 mm. Eight specimens (150 mm diameter and 75 mm high each) were compacted at a target 7% air void content using gyratory compactor. Six of the specimens were tested with the asphalt pavement analyzer (APA) to determine their rutting resistance. While other two specimens were tested using disc-shaped compact tension (DCT) to determine the cracking resistance at 10°C higher than low-temperature grade of the binder in the mixes. The cracking resistance was evaluated in terms of fracture energy. The results showed that mixes with RAP performed better than virgin mixes in terms of rutting and worse in terms of cracking resistance. 20% RAP, not 24% RAP mix was the most rut resistant mix.
Effect of RAP on Cracking and Rutting Resistance of HMA Mixes
The use of recycled asphalt pavement (RAP) has significantly increased in construction and rehabilitation of flexible pavements to ensure proper utilization of limited natural resources and for environmental benefits. Performance measures of asphalt pavement like cracking and rutting resistance under repetitive traffic and environment induced load are important criteria to assess the viability of the use of RAP in hot-mix asphalt (HMA). This research was conducted to evaluate the effect of RAP on cracking and rutting resistance of HMA mixes. Three different mixtures, Control (0% RAP), 20% RAP, and 24% RAP mixtures were considered for the study. Nominal maximum aggregate size (NMAS) used for all mixes was 12.5 mm. Eight specimens (150 mm diameter and 75 mm high each) were compacted at a target 7% air void content using gyratory compactor. Six of the specimens were tested with the asphalt pavement analyzer (APA) to determine their rutting resistance. While other two specimens were tested using disc-shaped compact tension (DCT) to determine the cracking resistance at 10°C higher than low-temperature grade of the binder in the mixes. The cracking resistance was evaluated in terms of fracture energy. The results showed that mixes with RAP performed better than virgin mixes in terms of rutting and worse in terms of cracking resistance. 20% RAP, not 24% RAP mix was the most rut resistant mix.
Effect of RAP on Cracking and Rutting Resistance of HMA Mixes
Saha, R. (author) / Karki, B. (author) / Berg, A. (author) / Melaku, R. S. (author) / Gedafa, D. S. (author)
International Conference on Highway Pavements and Airfield Technology 2017 ; 2017 ; Philadelphia, Pennsylvania
2017-08-24
Conference paper
Electronic Resource
English
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