Highlights Leaching characteristics of porous asphalt materials were examined. Acid rain affects the short-term leaching behavior of porous asphalt mixture. Biochar filler has a greater effect on the leaching of total nitrogen. Adverse effects are found from leachate under long-term soaking. The leaching extent of porous asphalt can be determined after testing for 7 days.
Abstract Permeable pavement leachate can be a potential issue as contained pollutants are washed off by rainfall. This paper investigated the leaching of porous asphalt mixture (PA) with different fillers via static tank leaching test. The effects of PA leachate on zebrafish were explored. The results show that within 1–2 days, the leaching of alkali, total nitrogen (TN), and total phosphorus (TP) fluctuates greatly, with acidic rain accelerating TN leaching. After long-term soaking, the pH of most leachate stabilizes at 8, and the leaching amounts of TN and TP in acidic leachant are 0.2 mg/kg and 0.04 mg/kg, respectively. PA with biochar leaches higher TN in deionized water (DI). Short-term leachate has little effect on zebrafish, while attention is needed when the damage degree or the Nemerow pollution index exceeds 5. Static tank leaching test is suitable for monolithic PA specimens, and leaching can be determined after 7d soaking in DI.
Study on leaching characteristics and biotoxicity of porous asphalt with biochar fillers
2023-07-26
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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