Open graded friction course (OGFC) has been under use over the past decades by the highway agencies as the road surfacing material. The friction course reduces splash/spray, noise, and water accumulation, and provides better visibility and traction. In addition, OGFC has the ability to adsorb particulate pollutants into its internal pores/voids. However, it cannot adsorb dissolved/non particulate constituents, especially heavy metals. The objective of this study is to prepare multifunctional open graded friction course pavement (MOGFC) as road surfacing material which not only preserves OGFC’s advantages, but also extends its ability to remove heavy metals from highway runoff water. This research investigated batch adsorption capacity for Cu and Zn by five different additives (bentonite, zeolite, silica, organo clay, and fly ash). Bentonite, zeolie, and fly ash showed maximum adsorpton capacity of 1.43, 10.63, and 11.06 mg/g for copper and 1.17, 1.95, and 10.24 mg/g for zinc. Silica and organo clay resulted in low adsorption capacity. The metal removal efficiencies for MOGFC were also evaluated. Results showed that MOGFC with bentonite, zeolite, and fly ash has the ability to remove Cu and Zn from the synthesized highway runoff water. Cu and Zn removal efficiency increased as the additives were increased. MOGFC with bentonite, zeolite, and fly ash exhibited maximum removal efficiency of 76%, 73%, and 94% for copper, and 42%, 43%, and 86% for zinc. In addition to this, observed permeability rate also indicated that MOGFC can avoid the accumulation of highway runoff on the road surface. It has concluded that this in situ treatment technique will have both environmental and economic benefits, as it is inexpensive and eliminates the need for external highway runoff treatment facilities.
|Advisor:||Gang, Daniel D., Khattak, Mohammad Jamal|
|Commitee:||Farmer-Kaiser, Mary, Sun, Xiaoduan|
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 54/06M(E), Masters Abstracts International|
|Keywords:||Copper, Highway runoff, Open graded friction course, Zinc|
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