原文传递
Hydraulic and Environmental Behavior of Recycled Asphalt Pavement in Highway Shoulder Applications
| 题名： | Hydraulic and Environmental Behavior of Recycled Asphalt Pavement in Highway Shoulder Applications |
| 作者： | Aydilek, A. H.; Mijic, Z.; Seybou-Insa, O. |
| 关键词： | Reycled asphalt pavement##Hydraulic conductivity##Leaching##Contaminant transport##Highway shoulders## |
| 摘要： | Hydraulic conductivity of seven recycled asphalt pavement materials (RAPs) was evaluated through a series of constant-head tests, while their leaching potential was determined through batch leach tests and column leach tests. The contaminant transport in surface waters as a function of distance was numerically simulated. Laboratory test results indicated that the hydraulic conductivity of recycled asphalt pavement is comparable to that of natural aggregates with the gradation of clean sand-gravel mixture as it ranged from 6.9 x 10(sup -3) cm/s to 1.1 x 10(sup-2) cm/s. The concentrations of all metals released during the water leach tests were below the water quality limits, except for copper. Column leach tests yielded generally low or non-detectable metal concentrations. The deviation from this trend occurred for copper and zinc concentrations, but they fell below the regulatory limits at 4 and 0.5 pore volumes of flow, respectively. Arsenic can leach out, most probably as less toxic pentavalent arsenic (As(V), under acidic conditions. Concentrations of all metals from RAP conformed to the water quality standards in surface waters after passing through the natural formation. The results of a series of TCLP tests showed that two polycyclic aromatic hydrocarbons (PAHs), chrysene and Indeno[1,2,3-cd]pyrene, may be present in the leachates, albeit, at concentrations very comparable to those leach from a new asphalt material. The results of the geochemical modeling indicated that the leached metals were solubility-controlled. Oxide and hydroxide minerals control the leaching of aluminum and iron; whereas, leaching of barium, calcium and magnesium were controlled by carbonate and/or sulfate minerals. |
| 总页数： | 287 |
| 报告类型： | 科技报告 |
相关文献
- Hydraulic and Environmental Behavior of Recycled Asphalt Pavement in Highway Shoulder Applications, Research Summary
- Asphalt Materials and Mixtures 2013, Vol. 2. Transportation Research Record: Journal of the Transportation Research Board, No. 2371.
- Application of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Hot-Mix Asphalt: National and International Perspectives Current Practice. Papers from a Workshop. Transportation Research Ci
- Study of the Use of Recycled Paving Material; Rept. to the Congress
- Materials Recycling and Reuse - Finding Opportunities in Colorado Highways.
- Evaluation of Specialized Hot Mix Asphalt Mixes for Massachusetts.
检索历史
应用推荐
