Massachusetts will serve as the lead state on this pooled fund study. The study will be conducted by Dr. Walaa Mogawer, P.E., at the University of Massachusetts at Dartmouth. Preliminary discussions with other Northeast states indicates strong interest. As lead state, we are planning on a commitment of $50,000 per year.

The primary objective of this research project is to design and evaluate maintenance and rehabilitation HMA mixes as well as develop a reflective crack relief layer (RCRL) mix utilizing modified binders. Specifically, thin lift mixes with a NMAS of 4.75 mm and 9.5 mm and a surface mix with a NMAS of 12.5 mm will be developed as maintenance and rehabilitation mixes using Superpave design methodology. These mixes will then be evaluated for their resistance to low temperature cracking and rutting. The secondary objective is to compare the performance of these modified mixes. Finally, a RCRL mix will be developed and tested for its potential to prevent or mitigate reflective cracking.

A minimum commitment of $25,000 per year is requested. Please contact the lead agency contact if you would like to commit a lesser amount, based upon your availability of funds. Commitments in amount greater than the minimum requested are welcomed. An upfront commitment of the two-year amount is preferred.