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Created2016-08
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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.

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.
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Created2013-02
Description

The Arizona Department of Transportation’s (ADOT’s) process for working with Local Public Agencies (LPAs) in the development and delivery of their transportation projects has evolved over the years. Recent changes in Arizona’s economy have reduced the distribution of state funds for local transportation projects, which has increased the demand for

The Arizona Department of Transportation’s (ADOT’s) process for working with Local Public Agencies (LPAs) in the development and delivery of their transportation projects has evolved over the years. Recent changes in Arizona’s economy have reduced the distribution of state funds for local transportation projects, which has increased the demand for federal funding sources. In response to the anticipated increase in LPA projects desiring the use of federal funds and the continuing need to meet state and local transportation requirements, this updated manual highlights the steps necessary to capably deliver LPA projects in compliance with federal, state, and local requirements.

The ADOT Local Public Agency Projects Manual has been a collaborative effort among the various Divisions, Groups, and Sections within ADOT, as well as the Federal Highway Administration (FHWA) Arizona Division, with input from LPAs. ADOT would like to express sincere gratitude to Logan Simpson Design Inc. for successfully facilitating that effort and for their contribution to the production of this manual. Their hard work and in-depth coordination with ADOT and FHWA staff has been invaluable to the preparation of this manual.