OVERVIEW OF LATEX MODIFIED CONCRETE OVERLAYS

Twelve bridges with latex modified concrete (LMC) overlays ranging in age from new to 13 years were studied and their general condition found to be good. The half cell and chloride data were inconclusive because background data were not available for the older overlays, but the data should be useful some 5 to 10 years from now if similar data are collected at that time for comparison. The shear strength of the bond between the LMC overlays and the base concretes was about the same or greater that that of the base concrete, which indicates that good bonds were achieved and have been maintained. The permeability to chloride ions based on the rapid permeability test was an average of 773 coulombs (very low) for a 1.25 in. thick LMC overlay and 4,590 coulombs (high) for the base concretes. The inverse of the ratio of the logarithm of the permeability of the LMC overlay to that of the base concrete was 1.27, which provides a very conservative indication of the relative benefits to be obtained from the LMC overlay as compared to an A4 concrete overlay. The three sets of cost assumptions developed indicate that an LMC overlay costs 6% to 31% more than an A4 concrete overlay. Considering that the benefit-to-cost ratio ranged from 0.97 to 1.20, it was concluded that for bridges in which the low permeability provided by the LMC overlay is needed, the benefits usually obtained are worth the extra cost when compared to that of an A4 concrete overlay.

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• Record URL:
  • https://rosap.ntl.bts.gov/view/dot/19080
• Corporate Authors:

  Virginia Highway and Transportation Research Council

  Charlottesville, VA  United States 

  Virginia Department of Highways

  Traffic and Planning Division, 1221 East Broad Street
  Richmond, VA  United States  23219
• Authors:
  • Sprinkel, M M
• Publication Date: 1984-7

Media Info

• Pagination: 39 p.

Subject/Index Terms

• TRT Terms: Benefit cost analysis; Bonding; Chlorides; Concrete pavements; Ions; Latex; Overlays (Pavements); Permeability; Shear strength
• Subject Areas: Bridges and other structures; Design; Highways; Materials; I24: Design of Bridges and Retaining Walls; I32: Concrete;

Filing Info

• Accession Number: 00393811
• Record Type: Publication
• Report/Paper Numbers: VHTRC 85-RI Final Rpt.
• Files: NTL, TRIS, STATEDOT
• Created Date: Jun 30 1985 12:00AM