A LATEX-MODIFIED CONCRETE OVERLAY ON PLAIN-JOINTED CONCRETE PAVEMENT

A latex-modified concrete overlay was applied over Interstate 5 in Northern California at a Strategic Highway Research Program Specific Pavement Studies (SPS) test site. The objective was to assess a potentially lower cost latex overlay system. The cost of the overlay was to be reduced by eliminating surface prewetting and the wet burlap cure. The test section was placed 300-m long across three lanes. Unique features of the overlay were: 1) it was placed on dry substrate, 2) latex content was 43 percent higher than conventional practice, 3) cure was by curing compound rather than wet burlap, and 4) it was on a plain jointed portland cement concrete pavement. Bond to the substrate was very good. Curing compound provided a sufficient curing membrane when applied at the proper rate. The system was evaluated yearly. To date, the only problem has been at the joints, which present a serious problem for bonded overlays. Delaminations or spalls have occurred often at the tranverse joints. The objective was met although the system is inappropriate for use on jointed pavements. A latex-modified concrete overlay can be placed on a dry substrate and bond well. It can be cured successfully with a curing compound that conforms to American Society for Testing and Materials C 309. This type of overlay is unsuitable for jointed pavements, though, unless careful attention is given to the joint detail.

Language

  • English

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Filing Info

  • Accession Number: 00716423
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jan 31 1996 12:00AM