The Use of Polyphosphoric Acid in Asphalt Binders

Asphalt is one of the most widely used materials for road construction. According to the Asphalt Institute, around 95% of all roads in the United States are made of asphalt binders. One of the most important and challenging tasks of the asphalt industry is to develop stronger and more durable pavements which are able to withstand high volume traffic, continuous increase in the traffic flow as well as variations in climate. Therefore, more focus has been put on research in transport related areas in the last several years, including new and improved road materials. At the moment significant research and development efforts in asphalt technologies is taking place worldwide. One of the most developed technologies is the application of modified bitumens. Modified bituminous materials can bring real benefits to highway maintenance/construction in terms of better and longer lasting roads and savings in total road life cost. Typical modifiers include polymers, chemical additives, or a combination of the two.

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