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This report contains all of the papers presented at a workshop on Continuously Reinforced Concrete Pavements (CRCP) which was held in New Orleans, Louisiana. The information presented at the workshop covered all aspects of CRCP including design, construction, and maintenance procedures. The primary emphasis was concentrated on maintenance procedures. The proceedings include papers on polymer patching, under sealing, and flexible and rigid overlays.
Asphalt overlays are typically used to extend the life of continuously reinforced concrete pavement (CRCP) because they can be placed in one or more layers while traffic uses the adjacent lane and can be opened to traffic in a short time. Hydraulic cement concrete overlays have also been used to extend the life of CRCP but have often not been considered an alternative to asphalt because of the higher cost and longer curing time. In 2012, the Virginia Department of Transportation rehabilitated a 4.8-mi section of the westbound lanes of a CRCP on U.S. 58 in Southampton County using a 4-in-thick bonded concrete overlay and a 7-in-thick unbonded concrete overlay with a 1-in asphalt separation layer. The four-lane, divided primary highway is an 8-in-thick CRCP placed over a 6-in cement-treated aggregate layer. Saw cutting was used to form joints at 6 ft by 6 ft panels for an unbonded overlay, and tie bars were used along the centerline of the pavement and along both shoulders. A concrete overlay was placed on the shoulders of the unbonded overlay, and asphalt was placed on the shoulders of the bonded overlay. Two layers of asphalt with a total thickness of 5 in were placed on a 9.75-mi section of the eastbound lane of U.S. 58, which provided cost information that was used to compare the alternatives. Since traffic management was very different for the two projects, definitive conclusions on the total cost of asphalt versus concrete overlays could not be drawn. On the basis of material costs alone, concrete and asphalt can be competitive options for extending the service life of CRCP. Construction of the concrete overlays was successfully executed on time. The concrete was of high quality with good strength and low permeability. The bonded overlay is well bonded. The ride quality was much better than for the original pavement. Using the initial cost of materials in-place, the cost of the bonded and unbonded overlays was approximately the same, at an average of 3 dollars 6 to 3 dollars 8 per square yard. The unit cost of patching concrete pavements is approximately 6 times the cost of the bonded concrete overlay and approximately 4 times the cost of an unbonded overlay. VDOTs Materials Division should consider the use of bonded concrete overlays to extend the life of CRCPs that are in good condition and need little patching (
Introductory technical guidance for civil engineers and construction managers interested in resurfacing continuously reinforced portland cement concrete pavement for streets and highways.
Introductory technical guidance for civil engineers, highway engineers and other professional engineers and construction managers interested in overlays for continuously reinforced portland cement concrete pavements. Here is what is discussed: 1. INTRODUCTION, 2. TYPES OF OVERLAYS INVOLVING CRC PAVEMENT, 3. GENERAL APPROACHES TO OVERLAY DESIGN, 4. CRC OVERLAY TYPES AND PERFORMANCE.