EVALUATION OF DIFFERENT OVERLAYS AND PROPOSED DESIGN METHOD

This paper presents the details of studies on five test sections of overlays each of 100 metres length constructed over an existing flexible pavement using (I) 4 cm thick bc, (II) 8 cm thick bc, (bituminous concrete), (III) 10 cm thick wbm + 2 cm pmc, (IV) 15 cm thick wbm + 2 cm pmc and (V) 20 cm thick wbm + 2 cm pmc. However, the actual thickness of overlay at each deflection observation point was determined by a network of spot levels before and after the overlays were constructed. The pavement and overlays were subjected to Benkelman beam deflection studies and surface condition evaluation. The values of deflection reduction factor, R, were worked out for the overlay materials; it was found that the r-value increases with overlay thickness. Regression equations were worked out for r-values on thickness of bc and wbm overlays. The equivalency factor or bc in terms of (wbm + pmc) was worked out using the results of this study. The equivalency factor of bc is found to decrease with increase in overlay thickness. An interim chart for the design of bc and wbm overlays over flexible pavements has been prepared. The economics between the two types of overlays has been discussed. (Author/TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02580500
• Corporate Authors:

  Indian Roads Congress

  Jamnagar House, Shahjahan Road
  New Delhi,   India  110 011
• Authors:
  • Shivalingaiah, L
  • Rajagopal, A S
  • Justo, CEG
• Publication Date: 1982-11

Media Info

• Features: Figures; References; Tables;
• Pagination: p. 489-521
• Serial:
  • Journal of the Indian Roads Congress
  • Volume: 43
  • Issue Number: 3
  • Publisher: Indian Roads Congress
  • ISSN: 0258-0500

Subject/Index Terms

• TRT Terms: Asphalt concrete; Benefit cost analysis; Benkelman beam; Bituminous materials; Construction; Deflection; Economics; Equations; Evaluation and assessment; Flexible pavements; Overlays (Pavements); Pavement design; Pavements; Profilometers; Reduction (Chemistry); Regression analysis; Strength of materials; Structural strengthening; Subgrade (Pavements); Thickness
• Old TRIS Terms: Pavement deflection; Reduction
• ITRD Terms: 6105: Benkelman beam; 4955: Bituminous materials; 3655: Construction; 226: Cost benefit analysis; 5586: Deflection; 255: Economics; 9020: Evaluation (assessment); 2944: Flexible pavement; 3055: Pavement design; 6103: Profilometer; 3096: Strengthening (pavement); 2950: Subgrade; 5933: Thickness
• Subject Areas: Construction; Data and Information Technology; Design; Economics; Highways; Pavements; I22: Design of Pavements, Railways and Guideways;

Filing Info

• Accession Number: 00387215
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• Files: ITRD, TRIS
• Created Date: Aug 30 1984 12:00AM