Latex Modified Portland Cement Overlays: An Analysis of Samples Removed From a Bridge Deck

Report No: 76-R25

Published in 1975

About the report:

This report describes an evaluation of the latex modified mortar overlay on the Route 85 (NBL) bridge over the Roanoke River. While the performance of the overlay has been generally satisfactory, corings and chloride analyses indicate the possibility of future distress beyond the cracking that has been noted to date The problems associated with the overlay have not resulted from the nature of the latex modified mortar nor from a failure of bond between the material and the original deck. Instead the results suggest that the deterioration is due to the use of a insufficient thickness of overlay in conjunction with the inadequate preparation of an original deck that had been previously subjected to chloride penetration. Based on the evaluation of several cores taken from the deck it cannot be recommended that thin layers of this material be used as a long-term solution for bridge deck deterioration problems where the decks have experienced prior corrosion of the reinforcing steel from chloride attack.

Disclaimer Statement: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.


  • Marvin H. Hilton, Hollis N. Walker, Wallace T. McKeel, Jr., P.E.

Last updated: January 29, 2024

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