[1] Iowa State Univ, Ames, IA 50010 USA
[2] Wiss Janney Elstner Assoc Inc, NDE Validat Ctr, Mclean, VA 22101 USA
[3] Fed Highway Adm, NDE Validat Ctr, Mclean, VA 22101 USA
[4] Wiss Janney Elstner Assoc Inc, Fairfax, VA 22031 USA
[5] Profess Serv Ind Inc, Turner Fairbank Highway Res Ctr, Mclean, VA 22101 USA
[6] Wiss Janney Elstner Assoc Inc, Norcross, GA 30093 USA