Bituminous Overlay Policy - a Performance Evaluation
Bituminous Overlay Policy - a Performance Evaluation

Author: Amy M. Schutzbach

Publisher:

Published: 1995

Total Pages: 54

ISBN-13:

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To address an increasing backlog of roadways in need of rehabilitation, the Illinois Department of Transportation (IDOT) began use of a standard overlay thickness policy in the early 1980's. On the non-interstate, or primary, system, first resurfacing or overlays over pavements being widened and resurfaced were allowed 2.5 inches. Subsequent resurfacing were limited to 2 inches. A provision in the policy allowed for exceptions. This report presents the results of an evaluation of the performance of bituminous overlays constructed on the primary system in accordance with IDOT'S overlay policy. Twelve projects were selected for monitoring. The results of visual surveys, deflection testing, and Condition Rating Survey (CRS) histories were analyzed. The standard overlay thickness policy met the FHWA required minimum 5-year performance period for Federal-aid rehabilitation projects on the primary system. Subsequent overlays were found to have shorter life spans than first overlays. Records of requests for exceptions to the standard overlay thickness policy were also reviewed. Information gathered from the records review was incorporated into the policy and used to create a more efficient process for reviewing requests for exceptions.

Evaluation of Hydraulic Cement Concrete Overlays Placed on Three Pavements in Virginia
Evaluation of Hydraulic Cement Concrete Overlays Placed on Three Pavements in Virginia

Author: Michael M. Sprinkel

Publisher:

Published: 2000

Total Pages: 15

ISBN-13:

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Three hydraulic cement concrete pavement overlays were placed in the summer of 1995 at three locations in Virginia. Two of the overlays were placed on continuously reinforced concrete pavement to prevent spalling caused by a shy cover over the reinforcement and to enhance the structural integrity. The third overlay was placed to correct a rutted asphalt pavement. The construction was funded with 20 percent Virginia Department of Transportation maintenance funds and 80 percent special ISTEA Section 6005 federal funds specifically allocated to demonstrate overlay technologies. ISTEA funds were also used to evaluate the installation and initial conditions of the overlays and to prepare the report. The variables in the study were concrete mix design, overlay thickness, and base material. Mineral admixtures and steel and plastic fibers were used to improve the mechanical properties and durability of the overlay concrete. Overlay thickness and base material were varied to determine their effect on overlay performance. Overlays that were 51 and 102 mm (2 and 4 in) thick worked well on hydraulic cement concrete pavements. Overlays that were 76 and 102 mm (3 and 4 in) thick worked well on asphalt concrete pavements. These overlays can be used to extend the life of the pavements.

Evaluation of Bonded Concrete Overlays on Asphalt Pavements
Evaluation of Bonded Concrete Overlays on Asphalt Pavements

Author: Linda M. Pierce

Publisher:

Published: 2022

Total Pages: 0

ISBN-13: 9780309687263

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The use of thin bonded concrete overlays on asphalt (BCOAs) as a rehabilitation treatment first gained momentum in the 1990s. Since the first documented thin BCOA application in the United States, in Louisville, Kentucky, in 1991, BCOAs have seen a dramatic increase in popularity. The TRB National Cooperative Highway Research Program's NCHRP Research Report 1007: Evaluation of Bonded Concrete Overlays on Asphalt Pavements documents BCOA practices through a literature review and agency survey; documents performance through site investigations that assessed in-service design, construction, performance, preservation, and rehabilitation; and compares the results of current design methods with actual performance. Supplemental to the report is NCHRP Web-Only Document 329: Bonded Concrete Overlays on Asphalt Pavements: Resources for Evaluation, which provides Appendices A through G of the contractor's final report.