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NCHRP 40-13 In recent years, petroleum and aggregate economics and supply have increased the need for high quality, cost effective alternatives to virgin paving mixtures. Transportation professionals are asking for methods that optimize the value of in-place materials while minimizing traffic congestion and the environmental impact of paving operations. Current pavement recycling and reclamation methods answer all of these needs, in particular - - Hot In-Place Recycling (HIR)
- Cold In-Place Recycling (CIR) and
- Full-Depth Reclamation (FDR)
These techniques provide economical and sustainable solutions that reduce demand on raw materials, energy consumption, and production of GHG, while maintaining functionality and performance.
Key issues to be addressed include the need for specific in-place recycling and reclamation strategies and a discussion of how they might be used within the planned life-cycle of a pavement. Information to be collected for this study includes: - Project selection criteria
- Pavement condition, traffic, geometric and environmental considerations
- In-place material testing and evaluation, including recyclability of existing materials
- Criteria used for selection of strategies
- Extent of annual construction program for each of the three strategies (including rationale for use)
- Types of liquids or stabilizers used to condition the RAP
- Mixture design methods
- Structural design considerations
- Processing methods and equipment
- Inspection and quality assurance
- Wearing course considerations
- Barriers to implementation, including: lack of engineering design standards; lack of evidence that it will work; lack of local, experienced contractors
- Tried it and it failed
- Opposition from competing industries
- Data on documented performance, costs, and benefits
- Quantification of environmental benefits
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| | NCHRP 40-01 information
Information to be gathered for the synthesis will include: - A comprehensive list of current candidate materials that are readily available or stockpiled for common usage, and their uses, in a matrix format
- Identify and review available test procedures for assessing physical and chemical characterization, compaction, geomechanical properties, long-term durability, and environmental performance, including suitability and risks
- Summarize best material preparation and quality control techniques (including stockpiling)
- Review possible modifications to transform marginal materials into suitable materials. This includes mechanical, chemical or environmental strategies.
- Address material handling issues associated with the use of recycled materials
- Explain design adaptations that may be required for successful use
- Identify site construction practices that have proven effective
- Identify failures, causes, and lessons learned
- Identify the major scientific, contractual and perceptual barriers to adoption of suitable alternative materials by states and steps used to overcome these barriers
- Cost savings from use of recycling, including energy and materials
- Gaps in knowledge and a research road map to address these
We are currently collecting information on a wide range of recycled materials and by-products. Content Assessment surveys have been developed for these topics (shown below).
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| | Please use the following link to provide basic informaiton and locations for your recycling projects. | |
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| | The Center just completed a final report for this project. The reports are available on the center website. The results from this two years study indicated the following: - Terminal blends containing crumb rubber have been used in the United States since 1980s. They have been used in California since 1990s in both chip seals and hot mixes. The performance of these products have been very good.
- Warm mix technology can be used with asphalt rubber hot mixes. They have not been used in the asphalt rubber spray applications.
- Additional work is needed to evaluate the warm mix technologies with terminal blend and asphalt rubber.
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