The use of select aggregate in a thin wearing surface of portland cement mortar to prolong or restore a concrete pavement's ability to develop high friction was accomplished in this project. Two fine aggregates, blast furnace slag and lightweight expanded shale were found to exhibit skid resistances greater than the other aggregates evaluated. The British Polishing Wheel was used in the Laboratory evaluation of aggregate to simulate wear. The need for a method of restoring friction to worn, but otherwise sound, concrete pavement led to field evaluation of several different techniques for placing a very thin overlay. The successful method was a broomed, very thin layer of mortar, 3 mm thick. This technique combined with portland cement mortars containing either latex or acrylic admixtures and either of the select aggregate was found to adhere well and provide very high skid numbers when tested by a skid trailer over a period of 2-1/2 years. The tests were on lightly traveled highways. The shallow depth of the overlay was essential for a good adhesion to the casing pavement and also resulted in economy because of the small volume of material required. The test strips were successfully placed on existing pavement without other preparation of the pavement surface. Oil or paint would require surface cleaning. (FHWA)

  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284

    Indiana State Highway Commission

    Indianapolis, IN  United States  46204

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590
  • Authors:
    • Scholer, C F
  • Publication Date: 1980

Media Info

  • Pagination: 20 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00341486
  • Record Type: Publication
  • Report/Paper Numbers: FHWA/IN/JHRP-80/16 Final Rpt.
  • Contract Numbers: 1(18) Part II
  • Files: TRIS, USDOT
  • Created Date: Dec 22 1981 12:00AM