DESIGN AND PERFORMANCE OF CEMENT-BOUND BASES

THE PAPER SURVEYS THE PRESENT STATE OF KNOWLEDGE REGARDING THE STRESS-STRAIN BEHAVIOR OF PAVEMENTS WITH CEMENT-BOUND BASES. THE ROAD IS CONSIDERED AS A LAYERED ELASTIC SYSTEM AND THE STRESSES DUE TO TRAFFIC LOADING AND THERMAL EFFECTS ARE ANALYSED. THE MAXIMUM COMBINED STRESSES DUE TO TRAFFIC AND TEMPERATURE ARE COMPARED TO MEASUREMENTS OF THE STRENGTH OF CEMENT-BOUND BASE MATERIALS AND IT IS SHOWN THAT ONLY IN THE STRONGER CEMENT-BOUND MATERIALS IN PAVEMENTS OF SUBSTANTIAL THICKNESS WILL GENERAL CRACKING BE AVOIDED. THE ONSET OF BASE CRACKING IN EXAMPLES OF TRAFFICKED PAVEMENTS IS EXAMINED AND FLEXURAL STRENGTH IS SHOWN TO BE A USEFUL PREDICTIVE PARAMETER. THE AUTHOR POINTS OUT THE DESIRABILITY OF DESIGNING PAVEMENTS CARRYING THE HEAVIEST TRAFFIC TO RESIST EARLY CRACKING OF THE BASE. THE MINIMUM THICKNESS RECOMMENDATIONS FOR PAVEMENTS WITH LEAN CONCRETE BASES GIVEN IN THE NEW EDITION OF ROAD NOTE NO.29 ARE ANALYSED AND SHOWN TO CONFORM TO THIS REQUIREMENT. FULL-SCALE ROAD EXPERIMENTS WERE CONSTRUCTED BY THE ROAD RESEARCH LABORATORY IN 1963-64 TO EVALUATE SYSTEMATICALLY THE EFFECT OF AGGREGATE TYPE, AGGREGATE GRADING, AND STRENGTH ON THE PERFORMANCE OF PAVEMENTS OF VARYING THICKNESS. THE "AS-LAID" CONDITION OF THE BASES IN THESE EXPERIMENTS IS DESCRIBED. SIGNIFICANT DIFFERENCES IN PERFORMANCE ARE EXPECTED TO BECOME APPARENT IN THE NEXT FEW YEARS.

  • Authors:
    • Lister, N W
  • Publication Date: 1972-2

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Filing Info

  • Accession Number: 00233555
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: TRIS
  • Created Date: Sep 25 1972 12:00AM