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• W641120723 abstract "An attempt was made to evaluate the rheological and mechanical properties of asphalt blended with binder extracted from recycled asphalt pavement (RAP). This report presents results of the investigation dealing with resistance characteristics against permanent deformation, fatigue and low temperature cracking. Two base asphalt binders (PG 58-28 and PG 64-22) typically used in Rhode Island were blended with RAP binders obtained from two sources at percentage of 0, 10, 20, 30, 40, 50, 75, and 100% based on the total weight of blended asphalt binder. The Dynamic Shear Rheometer (DSR) was used to evaluate the blended asphalt binders at high temperatures, i.e., 52, 58, 64, 70, and 76 deg C and intermediate temperatures, i.e., 19, 22, 25, 28, and 31 deg C. A good linear relationship between log dynamic shear and the amount of RAP binders was obtained from this study. It was also observed that an increase in RAP binder content causes an increase in dynamic shear. It was found that the addition of RAP binder generally increases the resistance against permanent deformation. However, the Superpave criteria of G*sin delta may dictate the maximum amount of RAP addition not to have fatigue cracking. The Bending Beam Rheometer (BBR) test was performed to evaluate the resistance characteristics of blended asphalt binder against thermal cracking at low temperatures, i.e., -6, -12, -18, and -24 deg C. It was observed that the creep stiffness increased and the m-value decreased for all temperatures as the amount of RAP binder content increased. It appears that the addition of RAP did not enhance the binder's resistance characteristic against low temperature cracking. Furthermore, the Superpave criteria of S(t) and m(t) may dictate the maximum amount of RAP not to have low temperature cracking. For the mechanical properties, the fracture toughness test was performed to characterize the fracture behavior. A series of experiments was conducted at loading rate of 152.4 mm per minute to evaluate the fracture toughness of the blended asphalt binders at different temperatures, i.e., 0, -10, and -20 deg C based on the principles of linear elastic fracture mechanics. It was observed that the fracture toughness decreased as a function of RAP binder content. The crack propagation became unstable as the RAP amount was increased and the temperature was decreased. Consequentially, the increase of RAP amount and the decrease of temperature reduced ductility, and brittle fast fracture occurred. The dynamic constitutive behavior of blended asphalt binders was evaluated using the Split Hopkinson Pressure Bar test. It was observed that the performance of the binder was not affected by the addition of RAP binder at room nor at low temperatures. At -20 deg C, there was no significant difference in the average maximum flow stresses, as the RAP binder amount was increased; and the maximum flow strain was decreased, as the RAP binder content was increased. The addition of RAP binder increased the degree of brittle failure." @default.
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• W641120723 date "2002-08-31" @default.
• W641120723 modified "2023-09-24" @default.
• W641120723 title "LOW TEMPERATURE CRACKING RESISTANCE CHARACTERISTICS OF RECYCLED ASPHALT PAVEMENT BINDER" @default.
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