USE OF THE BENKELMAN BEAM IN EVALUATING THE DESIGN, CONSTRUCTION AND PERFORMANCE OF ASPHALTIC PAVEMENTS IN THE BOROUGH OF ETOBICOKE

This report reviews the use of the Benkelman Beam tests for evaluating asphaltic pavements in the Borough of Etobicoke, which in the past 20 years has rapidly changed from a rural to an urban area. With the publication of the AASHO Road Test findings in 1962, the engineering staff at Etobicoke became very interested in their extensive use of the Benkelman Beam to measure pavement deflections on flexible pavements. Benkelman Beam tests on a few existing road pavements carried out during 1963 by Etobicoke, and the testing program being carried out by the Ontario Department of Highways,further indicated the merits of this type of analysis for evaluating the strength of flexible type pavements. The Benkelman Beam testing requirements were, therefore, included in Subdivision Agreements commencing in 1964. The maximum rebounds were initially set at 0.045 in. (0.114 cm) for pavement of "superior classification" and 0.060 in. (0.152 cm) for normal residential streets. These requirements were altered in Subdivision Agreements prepared in and after 1966 on the basis of the recommendations of the Canadian Good Roads Association. The following maximum Benkelman Beam rebound values were established as criteria for all Borough flexible type pavements and are presently still in effect: (a) normal residential street, no heavy traffic, normally 28 ft. (8.54 m) pavement, 0.060 in. (0.152 cm) maximum deflection; (b) residential streets, acting as a collector and with anticipated bus traffic, normal industrial street, normally 32 ft. (9.76 m) pavement, 0.045 in. (0.114 cm) maximum deflection; and (c) heavily travelled residential streets and pavements of superior classification, normally 4 lanes, 0.035 in. (0.089 cm ) maximum deflection.

  • Authors:
    • Brownlow, D C
  • Publication Date: 1972

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  • Accession Number: 00096459
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 13 1975 12:00AM