Repeated loading of stabilized recycled aggregate base course

Khaled Sobhan*, Raymond John Krizek

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

An experimental investigation was conducted to study the fatigue behavior, resilient properties, and progressive accumulation of damage due to repeated flexural loads on a fiber-reinforced pavement base course material composed of cement-stabilized recycled concrete aggregate and fly ash. The primary objectives of this endeavor were (a) to determine the resistance to fatigue failure in terms of traditional S-N curves, and compare the behavior with other typical stabilized materials, (b) to determine the variation of the cumulative plastic strain with the number of loading cycles and the degradation of the dynamic elastic modulus, (c) to evaluate the extent of accumulated damage in terms of a fatigue damage index, and (d) to demonstrate the application of laboratory-derived material properties in a mechanistic design method. All specimens contained (by weight) 4% cement, 4% fly ash, and 92% recycled aggregate; the fiberreinforced specimens contained an additional 4% (by weight) hooked-end steel fibers. Results show that the unreinforced material has a fatigue strength comparable to virtually all typical stabilized highway materials. The degradation of the dynamic elastic modulus due to repeated loading was found to be less than 25% of the initial modulus. The resilient modulus in flexure for this material was found to be comparable to values reported for traditional soil-cements materials. Miner's Rule of linear summation of damage is applicable to the unreinforced material, but not to the fiber-reinforced material. A modest amount of reinforcing fibers was quite effective in increasing the fatigue resistance and retarding the rate of damage accumulation in this lean cementitious composite containing primarily waste materials. Finally, the laboratory derived fatigue properties are incorporated into an elastic layer mechanistic method to illustrate a typical base course design.

Original languageEnglish (US)
Pages (from-to)180-194
Number of pages15
JournalGeotechnical Special Publication
Issue number79
StatePublished - Dec 1 1998

ASJC Scopus subject areas

  • Soil Science
  • Building and Construction
  • Architecture
  • Earth and Planetary Sciences(all)
  • Environmental Science(all)

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