Mechanical Design of Ultra-Thin White-Topping with High Strength Concrete Panel

An ultra-thin white-topping structure with high strength concrete panel (HSCWT) was developed. In the structure, 30 mm thick concrete panels, which are produced from steel fiber reinforced concrete with a flexural strength of 20 MPa, are placed on an existing asphalt pavement and the interface between the panels and the asphalt pavement is grouted to bond them. Test pavements of HSCWT were constructed on an accelerated loading facility and were subject to moving axle loads. After 150,000 axles passed over the pavements, although small gaps developed between HSC panels and grout near joints, any severe cracks did not develop. Improved textures on the bottom face of panels were found very effective to bond the panel and grout. Although simulation of the loading test with dynamic 3DFEM fairly well represented the strain time histories generated by the travelling axle load, visco-elastic properties of asphalt layer could not be clearly identified. Stress analysis with assumed visco-elastic parameters revealed that the stresses in the panel due to axle load are much less than the strength of the HSC panel, if the panel and the grout is fully bonded at the interface. Based on the results, a mechanical design procedure for HSCWT is developed. In the procedure, tensile strains in the underlying asphalt layer are calculated with 3DFEM and fatigue damage of the asphalt layer is estimated from the tensile strains using fatigue curve of asphalt mixture. It was found that viscosity of asphalt layer and vehicle speed significantly affect fatigue life of asphalt layer.

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  • Supplemental Notes:
    • Abstract reprinted with permission from the International Society for Concrete Pavements.
  • Corporate Authors:

    International Society for Concrete Pavements

    6305 Oyster Bay Court
    Bridgeville, Pennsylvania  United States  15017
  • Authors:
    • Nishizawa, Tatsuo
    • Obata, Hiroyuki
    • Sasaki, Iwao
  • Conference:
  • Publication Date: 2008

Language

  • English

Media Info

  • Media Type: Digital/other
  • Features: CD-ROM; Figures; Photos; References; Tables;
  • Pagination: pp 894-904
  • Monograph Title: 9th International Conference on Concrete Pavements: The Golden Gate to Tomorrow's Concrete Pavements

Subject/Index Terms

Filing Info

  • Accession Number: 01494776
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Sep 23 2013 11:18AM