Thin White Topping Overlay: Insights from an Experimental Stretch

At present many metropolitan cities in the country, including Mumbai, face the problem of addressing severe pavement distresses in the old flexible (bituminous) pavements after each monsoon, incurring huge expenditure. Though cement concrete pavements, because of their long life and superior performance, greatly reduce the maintenance expenditure, often due to initial investment constraints, this option is not chosen. There is need for development of new and innovative pavement repair and strengthening strategies, which are cost effective and less maintenance intensive. One such innovative pavement strengthening strategy is to provide Thin or Ultra-Thin white topping overlay. Ultra-Thin White topping is a rehabilitation technique in which a 50 to 100 mm thick layer of high strength, fiber-reinforced, cement concrete is place on a milled surface of rutted and/or cracked bituminous concrete pavement. Thin and UTWT overlays have been successfully utilized as pavements for roads with low to medium traffic. This study provides the details of investigation, structural design, mix design, construction, and instrumentation carried out for an actual thin white topping (TWT) pavement overlay constructed over an existing flexible pavement for a road in Greater Mumbai. Through thermocouples installed in the pavement, the temperature differential between the top and bottom of the TWT have been measured and interpreted. With the use of a specifically designed high early strength concrete if it was possible to open the rehabilitated road within a week's time. Through the analysis of temperature data, it was found that the temperature differential between top and bottom of the TWT layer is much less than the one specified in Indian Roads Congress (IRC) guidelines (IRC: 58-2011).

  • Availability:
  • Supplemental Notes:
    • Abstract reprinted with permission from the publisher.
  • Authors:
    • Thombare, Vishal R
    • Rao, K V Krishna
  • Publication Date: 2016-4

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; Photos; References; Tables;
  • Pagination: pp 37-51
  • Serial:
    • Indian Highways
    • Volume: 44
    • Issue Number: 4
    • Publisher: Indian Roads Congress
    • ISSN: 0376-7256

Subject/Index Terms

Filing Info

  • Accession Number: 01605324
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 18 2016 5:35PM