A Study to Evaluate Low Temperature Performance of Reclaimed Asphalt Pavement in Hot Mix Asphalt at Different Degrees of Blending

Reger, Darren; Norton, Alan; Mehta, Yusuf A.; Nolan, Aaron; DuBois, Eric; Kehr, Dan
March 2012
Proceedings of the International Conference on Waste Technology ;2012, p400
Conference Proceeding
Currently New Jersey state specifications limit the percentage of RAP to 15 percent for surface courses and 25 percent for the intermediate and base courses; however, other states have implemented much higher percentages. The limitations are placed because the interaction between the virgin and RAP binder is unknown in two ways. First, the amount of residual binder that is active in a mix, known as degree of blending, is currently assumed to be 100 percent. Second, the effect that this blended binder will have on performance still needs to be investigated due to the fact that aged binder has a tendency to be stiffer. The low temperature performance was evaluated through the use of the disc shaped compacted tension test. These tests were performed on 25 and 35 percent RAP samples as well as a control mix and RAP samples from Delaware to determine if the current specifications for degree of blending should be altered and if the amount of RAP can be increased. It was found that the assumption of 100 percent degree of blending could lead to under-asphalting and decreased performance for 25 percent RAP. The use of softer binders to compensate for higher percentages of RAP can raise the fracture energy of a given mixture; however, it will also decrease the stiffness of the mixture with the assistance of the DOB. The high RAP mixtures that fractionated the RAP and had an overall finer gradation appeared to have higher fracture energy.


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