Exploration of novel multifunctional open graded friction courses for in-situ highway runoff treatment.
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2014-07-01
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Abstract:This study found that the possible functional additives such as bentonite, zeolite, and clay
cannot increase the physical and mechanical properties of PCP, neither the removal of Cu and
Zn. Lime is effective in enhancing the physical and mechanical strengths of PCP, but cannot
improve the removals of Cu an Zn from runoffs. On the other hand, PCP alone has a long-term
removing capability for Cu and Zn. The capacity comes from the ion exchange with huge
amount of calcium contained in the raw material (cement) in PCP. Therefore, the use of PCP on
roadway and parking lots can not only mitigate the storm water runoff, but also provide longterm
environmental benefits by removing heavy metals from the runoffs.
It is recommended that a long-term, pilot scale test be further performed to more closely
simulate the real-life situation of PCP and quantify the reduction of pollutants in the runoffs.
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