Cold in-place recycling and full depth reclamation are growing technologies for rehabilitating and strengthening in-service roads. Relative to conventional remove and replace road rehabilitation systems, the potential benefits of full depth strengthening include optimal reuse of in situ road materials (particularly high quality aggregate materials), more time efficient construction execution resulting in reduced interruptions to residents and business owners, as well as minimal weather exposure risk for contractors during construction. This paper summarizes the findings of two pilot urban road rehabilitation projects that employed cold in-place recycling and full depth reclamation. Findings include the results of a full depth strengthening mechanistic design approach, non-destructive structural asset management surveys to validate structural end value capital, and construction time comparisons. This research found that cationic asphalt emulsion and Portland cement stabilization significantly improved the laboratory mechanistic-climatic performance of in situ recycled materials. It was also found during the design phase that the addition of Portland cement to the asphalt emulsion stabilization system significantly improved its mechanistic-climatic durability. Based on the post construction structural asset management surveys, it was found that cold in-place recycling and full depth reclamation significantly improved the asset value of rehabilitated urban streets and provided a road structure equivalent to a conventional system. Cold in-place recycling and full depth reclamation is well suited for strengthening urban roads with respect to capital cost savings and where road closure time may have a significant impact on adjacent homeowners and commercial businesses. These two projects showed a reduction in project execution time with cold in-place recycling and full depth strengthening relative to conventional road strengthening systems.
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