Effect of exposure test conditions on leaching behavior of inorganic contaminants from recycled materials for roadbeds |
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| Authors: | Hirofumi Sakanakura Masahiro Osako Akiko Kida |
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| Affiliation: | 1. Laboratory of Soil Environment Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;2. Laboratory of Groundwater and Mass Transport, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;3. Nippon Koei Co., Ltd., Tokyo 102-0083, Japan;4. Shimizu Corporation, Tokyo 150-8007, Japan;5. Pacific Consultants Co., Ltd., Tokyo 163-0730, Japan;6. Civil Engineering Research Institute for Cold Region, Public Works Research Institute, Sapporo 062-8608, Japan;1. Laboratory of Soil Environment Engineering, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;2. Laboratory of Groundwater and Mass Transport, Faculty of Engineering, Hokkaido University, Sapporo 060-8628, Japan;3. Horonobe Research Institute for the Subsurface Environment, 5-3 Sakaemachi, Horonobe, Japan |
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| Abstract: | Throughout the utilization of recycled materials, weathering factors such as humidity, gas composition and temperature have the potential to change the material properties and enhance the release of inorganic contaminants. In this research, the effects of weathering factors on recycled gravel materials for roadbeds were evaluated by applying three kinds of accelerating exposure tests: freezing–melting cycle test, carbonation test, and dry–humid cycle test. The effects of exposure tests were determined by X-ray diffraction (XRD) analysis and serial batch leaching test, making it possible to identify the change in release mechanisms. Sixteen elements, mainly metals, were investigated. Tested samples were molten slag from municipal solid waste, molten slag from automobile shredded residue, and crushed natural stone.After the exposure tests, the increase of cumulative release in the leaching test was generally less than 2.0 times that of the samples without the exposure test. Among the three test conditions, freezing–melting showed a slightly higher effect of enhancing the release of constituents. XRD analysis showed no change in chemical species. From these results, it was determined that the stony samples were stable enough so that their properties were not significantly changed by the exposure tests. |
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