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Assessment of Water Pollutants from Asphalt Pavements Containing Recycled
Rubber in Rhode Island
| 题名： | Assessment of Water Pollutants from Asphalt Pavements Containing Recycled Rubber in Rhode Island |
| 作者： | Raymond M. Wright, K. Wayne Lee, James T. Quinn, Pradeep Vashisth and Christopher Reddy |
| 关键词： | Water Quality, Crumb Rubber Modifier, Trace Metals, Organics, Hot Mix Asphalt, and Asphalt Pavement |
| 摘要： | Use of recycled rubber in asphalt pavement has been considered as a viable alternative on the basis It provides a means for disposal of scrap tires and a savings In quantity of construction materials. In this study hot mix asphalt (HMA) specimens with and without crumb rubber modifier (CRM) were analyzed for different environmental conditions. The CRM was added to HMA through both the wet and dry process. The CRM was procured from three different sources to prepare specimens. Cylindrical specimens were tested in the Particle Entrainment System (PES) at two different temperatures and three different pH levels. Runoff was also tested from slab and chip seal specimens subjected to light, wear and simulated rainfall. Water samples were collected in three phases: (1) water quality extraction of individual CRM samples, (2) water quality evaluation for cylindrical HMA specimens at varying environmental conditions (pH and temperature); and (3) water quality evaluation for slab HMA and chip seal specimens under simulated rainfall. Collected water samples were tested for trace metals and organics. A total of six metals were analyzed in the laboratory, i.e., Cr, Pb, Ni, Cu, Cd, and Zn. In general the majority of metals showed higher concentrations at the extreme environmental conditions, i.e., maximum asphalt pavement temperature and lowest pH, i.e., 2.0. The benzothiazoles had the highest concentrations for the organic compounds studied. The highest benzothiazole concentrations occurred in the dry process at the highest temperature and at the highest pH, i.e., 12.0 conditions. Finally, based on the limited scope of this effort and comparison with water quality criteria, it appears that there is no evidence in this study that there will be a detrimental effect on the environment or to human health. |
| 报告类型： | 科技报告 |
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