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The contents of this report reflect the views of the author(s), who is responsible for the facts and the accuracy of the data presented herein. The contents do not necessarily reflect the official views or policies of the Virginia Department of Transportation, the Commonwealth Transportation Board, or the Federal Highway Administration. This report does not constitute a standard, specification, or regulation. Any inclusion of manufacturer names, trade names, or trademarks is for identification purposes only and is not to be considered an endorsement.

Title:

Evaluation of the Installation and Initial Condition of Hydraulic Cement Concrete Overlays Placed on Three Pavements in Virginia

Authors:

H. Celik Ozyildirim

Michael M. Sprinkel

Year:	1999

VTRC No.:	99-IR3
Abstract:	Hydraulic cement concrete pavement overlays were placed in the summer of 1995 at the following locations in Virginia: I-295 near Richmond, I-85 near Petersburg, Rt. 29 near Charlottesville. Overlays were placed on I-295 SBL (near mile marker 29) and I-85 SBL (near mile marker 51) in Virginia to prevent spalling caused by a shy cover over the reinforcement and to enhance the structural integrity. Both locations are continuously reinforced concrete pavement. An overlay was also placed on Rt. 29 NBL (1.6 km south of Charlottesville) in Virginia 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 this 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.