Data collection to determine the rate of bond strength development between concrete overlays and existing pavements and the evaluation of nondestructive testing methods for determining concrete strength were the objectives of this study. Maturity meters and pulse velocity meters were employed to determine the rate of flexural strength gain and determine the time for opening of newly constructed pavements to traffic. Maturity measurements appear to provide a less destructive method of testing. Pulse velocity measurements do require care in the preparation of the test wells and operator care in testing. Both devices functioned well under adverse weather and construction conditions and can reduce construction traffic delay decisions. Deflection testing and strain gaging indicate differences in the reaction of the overlay and existing pavement under grouting versus nongrouted sections. Grouting did enhance the rate of bond development with Type III cement outperforming the Type II grout section. Type III and Type II cement grouts enhanced resistance to cracking in uniformly supported pavements where joints are prepared prior to overlays achieving target flexural strengths. Torsional and direct shear testing provide additional ways of measuring bond development at different cure times.

  • Record URL:
  • Corporate Authors:

    Iowa State University, Ames

    Engineering Experiment Station
    Ames, IA  United States  50011

    Iowa Department of Transportation

    800 Lincoln Way
    Ames, IA  United States  50010
  • Authors:
    • Cable, J K
  • Publication Date: 1995-8


  • English

Media Info

  • Features: Appendices; Figures; References; Tables;
  • Pagination: 119 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00720181
  • Record Type: Publication
  • Report/Paper Numbers: Iowa DOT Project HR-561
  • Created Date: Apr 16 1996 12:00AM