CRACKING AND FAILURE OF CONCRETE TEST SPECIMENS UNDER UNIAXIAL QUASI-STATIC LOADING

THE PROPAGATION OF MICROCRACKS AND THE ULTIMATE FAILURE OF CONCRETE TEST SPECIMENS IN COMPRESSION, TENSION AND FLEXURE UNDER QUASI-STATIC LOADING CONDITIONS ARE DISCUSSED. IT IS DEDUCED THAT IN ALL THREE TYPES OF LOADING MICROCRACKS ARE FORMED IN THE SPECIMENS BEFORE FAILURE. THEY OCCUR FIRST AS AN EXTENSION OF THE INITIAL FLAWS ALONG THE BOUNDARIES BETWEEN THE COARSE AGGREGATE AND THE MORTAR, AND SUBSEQUENTLY CRACKS PROPAGATE ACROSS THE MORTAR OR AGGREGATE. IN TENSION AND FLEXURE, PROBABLY ONLY A FEW MICROCRACKS ARE FORMED BEFORE ONE OF THEM PROPAGATES THROUGH THE SPECIMEN CAUSING FAILURE. IN COMPRESSION, THE MICROCRACKS DO NOT EXTEND TO THE ENDS OF THE SPECIMENS BECAUSE OF ISOTROPIC COMPRESSION RESULTING FROM END RESTRAINTS; ULTIMATE FAILURE PROBABLY OCCURS WHEN RESISTANCE TO SHEARING FORCES IS OVERCOME EITHER AT THE BOUNDARIES BETWEEN THE SOUND AND CRACKED ZONES OR WITHIN THE CRACKED ZONES. /A/RRL/

  • Supplemental Notes:
    • pp 125-130, 18 REF
  • Corporate Authors:

    Cement & Concrete Assoc, London /UK

    /Proc Intl Conference
    ,   USA 
  • Authors:
    • Jones, R
  • Publication Date: 1968

Subject/Index Terms

Filing Info

  • Accession Number: 00213026
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Oct 19 1970 12:00AM