The use of phosphoric acid to stiffen hot mix asphalt binders

2014PDFTech ReportFHWA-HRT-14-086Phosphoric acidBituminous bindersAntistrip additivesHot mix paving mixturesAsphaltaggregatephosphoric acidsuperphosphoric acidpolyphosphoric acidlimeantistrip additivesX-ray fluorescence spectroscopyUnited StatesUnited States. Federal Highway Administration. Office of Infrastructure Research and DevelopmentArnold, TerryUnited States. Federal Highway AdministrationUnited States. Federal Highway Administration. Office of Infrastructure Research and DevelopmentFederal Highway AdministrationThis document offers guidelines for the use of phosphoric acid to stiffen asphalt binders for hot mix paving applications. Data are presented on the likely effect on pavement life, moisture resistance, and use with limestone aggregates and liquid amine antistrip additives. Analytical methods for the detection of phosphoric acid in asphalt binders are also presented. Asphalt producers, hot-mix paving contractors, and State departments of transportation are the main audiences