FATIGUE PERFORMANCE OF A BITUMINOUS ROAD MIX UNDER REALISTIC TEST CONDITIONS

A study whose purpose was the verification of Miner's rule for estimating the cumulative damage resulting from the phenomenon of fatigue is reported. A repeated-bending apparatus driven by a minicomputer, which was devised to generate and control stress or strain waves of variable amplitudes, is described. The fatigue behavior of a bituminous mix subjected to nine different loading patterns (simple, random, and block) was determined. The influence of rest periods of different lengths was studied for these cases. It is concluded that (a) to the extent that the spectrum of load amplitudes is known, a prediction method derived from Miner's law is applicable with an acceptable accuracy for random sequences that include no rest periods and (b) rest periods markedly increased fatigue life for the three loading patterns considered. These initial conclusions were used to derive a generalized form of Miner's law for loading conditions in which both stress amplitudes and the duration of rest periods are variable. This generalized law was verified by simulating actual conditions of traffic loading in fatigue tests. /Author/

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 30-37
  • Monograph Title: Bituminous materials and skid resistance
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00302233
  • Record Type: Publication
  • ISBN: 0309029597
  • Files: TRIS, TRB
  • Created Date: Feb 27 1980 12:00AM