Thin fibers of steel and polypropylene are being used in in the concrete mixture for Phoenix Valley Metro's light rail extension. Using the fibers instead of rebar cuts costs and construction time as well as decreasing the carbon footprint and increasing sustainability.

ASU Professor Barzin Mobasher (second from left), with the Ira A. Fulton Schools of Engineering’s School of Sustainable Engineering and the Built Environment, watches workers pour the last section of the northern spur of the Phoenix Valley Metro light rail extension.

Workers from Arizona Materials spread fresh concrete over the last section of the northern spur Phoenix Metro Valley light rail line extension. Using fiber-reinforced concrete enhances worker safety because they don’t have to navigate stepping over rebar while they pour and spread the concrete.