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Investigation of Limiting Criteria for Low Temperature Cracking of Asphalt Mixture
문기훈,Augusto Cannone Falchetto,Mihai O. Marasteanu 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.1
This paper investigates the possibility of developing low temperature limit criteria for asphalt mixtures, similarly to what is currently available in the standard specification for asphalt binder. The investigation is based on extensive experimental work that includes Bending Beam Rheometer (BBR) creep tests on asphalt binders and asphalt mixtures at low temperature and on semiempirical Hirsch model, and on the rheological model proposed by Christensen, Anderson and Marasteanu (CAM). Limiting asphalt mixture creep stiffness values are predicted from Pressure Aging Vessel (PAV; Long term aging) binder creep stiffness data and are next compared with results available in literature. Then, BBR creep data for Rolling Thin-Film Oven Test (RTFOT; Short term aging)asphalt binder are used to predict creep stiffness of the corresponding short term aged asphalt mixtures. Based on these results, a range of limiting stiffness values is obtained. Due to large variations in the calculated slopes of the mixture creep stiffness curves, a limiting value for the relaxation parameter m-value could not be recommended.
Using Recycled Asphalt Materials as an Alternative Material Source in Asphalt Pavements
문기훈,Augusto Cannone Falchetto,Mihai Marasteanu,Mugurel Turos 대한토목학회 2014 KSCE Journal of Civil Engineering Vol.18 No.1
Using recycled materials in pavement applications is a viable option to reduce costs and limit the environmental impact of road construction. During the past decades, many agencies in the U.S. have investigated the effect on pavement performance of adding Reclaimed Asphalt Pavement (RAP), and, more recently, Recycled Asphalt Shingles (RAS) to asphalt mixtures, and limits were proposed on the amount of recycled materials which can be used. This paper investigates the effect of adding both RAP and RAS to virgin asphalt mixtures by means of a simple low temperature creep test performed on asphalt mixture beams. From the experimental work, creep stiffness, m-value, thermal stress and critical cracking temperature are calculated and compared statistically and graphically. Based on the results, it is concluded that most of the mixtures prepared with combinations of RAP and RAS perform similarly to standard mixtures at low temperature. For a limited number of mixtures, a negative effect is observed.