Use of asphalt roofing shingle waste in HMA |
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| Affiliation: | 1. Civil Engineering, Texas A&M University, College Station, TX 77843, USA;2. Texas A&M Transportation Institute, Texas A&M University System, College Station, TX 77843, USA;3. School of Chemical and Metallurgical Engineering, University of the Witwatersrand, Johannesburg, Wits 2050, South Africa;1. Zachry Department of Civil Engineering, Texas A&M University, College Station, TX 3136 TAMU, USA;2. Texas A&M Transportation Institute, Texas A&M University, College Station, TX 3135 TAMU, USA;1. Department of Civil and Environmental Engineering, The University of Iowa, Iowa 52242, United States;2. Transportation Engineer, Iowa Department of Transportation, Iowa 50010, United States;3. Chemical and Biochemical Engineering, The University of Iowa, Iowa 52242, United States |
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| Abstract: | Like other construction materials, shingles have their own service life based on raw materials, production method and environmental and climatic conditions. At the end of their service life, shingles need to be replaced. However, these old shingles together with manufacturing scrap and handling waste require large storage areas and pollute the environment in time. Hence, additional usage of shingle waste is desirable. In this study, shingle waste in amounts of 1%, 2%, 3%, 4% and 5% by weight was added as an additive to asphalt concrete mixes prepared with the optimum binder content which yielded the best stability value was 5%. After determination of the optimum percentage of shingle to be added, rutting tests were performed on the specimens. Taking into account, the binder content existing in the shingle, mixtures were prepared with the reduced binder content by 0.5% and 1.0%. Test results show that waste shingles can be used in HMA as an additive to improve the Marshall stability and rutting resistance of the mixtures. |
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