Polyphosphoric Acid Modification of Asphalt Binders

In April 2009, the FHWA, the Minnesota DOT, and the TRB jointly sponsored a workshop on “Polyphosphoric Acid Modification of Asphalt Binders”.  The proceedings of the workshop have been compiled into Transportation Research Board (TRB) circular number E-C160 dated January 2012.

Download Circular E-C160.


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