Use of Polyphosphoric Acid in Asphalt Binders, Applications for Asphalt Paving — Executive Summary
Polyphosphoric Acid (PPA) has been used successfully in asphalt paving for more than 35 years. Extensive use of PPA either as a solo asphalt pavement binder modifier or in combination with synthetic polymers has been practiced in North America for more than 10 years. Polyphosphoric Acid (PPA) is increasingly being used worldwide to meet the high performance requirements for asphalt pavement binders in Superpave™ applications. In fact, over the past 5 years, an estimated 3.5 to 14% of the asphalt pavement placed in the United States contained PPA. PPA modified asphalt binders have been used to pave roads all across the country under a wide variety of traffic and weather conditions. These roads are performing as expected in terms of reliability and durability.
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