SCMT4 Las Vegas, USA, August 7-11, 2016 Fly Ash - An Important Ingredient for use in Hot-Mix ASHphalt Concrete Bruce W. Ramme 1a , Art Covi 1b , Ahmed Faheem 2 , and Konstantin Sobolev 3 1 We Energies, 333 W. Everett Street, Milwaukee, WI 53203, USA, 1a Email: <bruce.ramme@we- energies.com>, 1b Email: <art.covi@gmail.com> 2 Department of Civil & Environmental Engineering, College of Engineering, Temple University, 1947 North 12th St., Philadelphia, Pennsylvania 19122, USA, Email: <afaheem@temple.edu> 3 Department of Civil and Environmental Engineering, College of Engineering and Applied Science, University of Wisconsin-Milwaukee, 3200 North Cramer Street, Milwaukee, WI 5321, USA, Email: <sobolev@uwm.edu> ABSTRACT This paper presents an overview of laboratory and field demonstration work with beneficial use of fly ash in hot-mix asphalt. The blend of asphalt binder and fly ash is named “ ASHphalt”. The field demonstration took place at We Energies, an electric, gas and steam utility headquartered in Milwaukee, Wisconsin, USA. Environmental sustainability benefits include conservation of energy and natural resources as well as reducing CO2 and other environmental impacts. Economic and social benefits include development of construction technologies for longer life pavements with reduced maintenance costs, and reduced impacts for pavement users. The benefits of ASHphalt include: improved workability, easier compaction to specified density, improved binder aging resistance, a reduction in age-related cracking, extending the asphalt binder or reduction of binder content, a reduction in binder related issues, thermal stress relief, and reduced potential for thermal cracking. This paper shares the results of some laboratory testing and field demonstration work. INTRODUCTION The United States has more than 4.2 million km (2.6 million miles) of paved roads and highways, and 93% of those are surfaced with asphalt concrete. Many of those are full-depth asphalt pavements; others are asphalt overlays used to restore the performance of deteriorating concrete pavements. Each year, about 4,000 asphalt plants in the U.S. produce 450 to 500 million metric tons (500 to 550 million tons) of asphalt pavement material worth in excess of $30 billion [National Asphalt Pavement Association, 2016]. With continual repair of aging U.S. transportation infrastructure and increasing transportation volumes, high-performance paving materials are needed that beneficially incorporate spherically shaped fly ash with sustainability benefits such as improved performance and extended service life for society. In 2014, Fourth International Conference on Sustainable Construction Materials and Technologies http://www.claisse.info/Proceedings.htm