Matching Items (2)
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- All Subjects: Maricopa County (Ariz.)
- All Subjects: Waste products as road materials
- Creators: Arizona. Department of Transportation. Research Center
ContributorsVan Dam, Thomas John, 1960- (Author) / Dufalla, Nicole (Author) / Ram, Prashant (Author) / Smith, Kurt D. (Author) / Arizona. Department of Transportation. Research Center (Issuing body) / Arizona. Department of Transportation (Issuing body) / United States. Department of Transportation (Contributor) / United States. Federal Highway Administration (Contributor)
Created2016-08
Description
Instead of going to landfills, certain waste materials from industry and building construction can be recycled in transportation infrastructure projects, such as roadway paving. The beneficial use of waste materials in the construction of transportation infrastructure results in environmental benefits, as well as economic savings over the pavement life cycle. This study focused on the use of waste--i.e. reclaimed asphalt pavement (RAP), recycled asphalt shingles (RAS), ground tire rubber (GTR), recycled concrete aggregate (RCA), construction and demolition waste (CDW), and mine spoil as raw materials for building transportation infrastructure in Arizona. Technical feasibility, availability, and economics were considered in making recommendations regarding expanding the use of the most-promising materials. Recommendations included targeting slight increases in the RAP replacement level (especially in non-surface hot-mix layers and in unbound base and subbase layers), increasing use of GTR through terminal blending, and increasing use of RCA as base and subbase. Other opportunities identified for further investigation include significant increases in RAP replacement level in hot mix asphalt, use of RCA to replace virgin aggregate in new concrete, and facilitation of the use of CDW in some markets. Further research is encouraged on the use of construction and other waste materials to improve the performance of these materials to reduce risk and improve cost effectiveness.
ContributorsKuzmyak, J. Richard (Author) / Arizona. Department of Transportation. Research Center (Publisher)
Created2012-03
Description
Land Use and Traffic Congestion is an investigation into the links among land use, travel behavior, and traffic congestion. Researchers focused on four transportation corridors in the Phoenix area: three older neighborhoods with relatively mixed, higher density land use, and one suburban area with lower density but high traffic volumes. The analysis suggested that the higher density corridors exhibited less congestion due to the greater mix of uses, shorter trip lengths, more travel by transit and non-motorized modes, and the presence of a secondary street grid system.