ACOUSTIC EMISSION AND "POST-CRITICAL MECHANICAL BEHAVIOUR" OF CONCRETE SUBJECTED TO TENSILE STRESS

EMISSION ACOUSTIQUE ET "COMPORTEMENT MECANIQUE POST-CRITIQUE" D'UN BETON SOLLICITE EN TRACTION

In structural design the tensile strength of concrete is considered to be nil and its failure instantaneous. The study described in this article was conducted to confirm that a "post-critical" behaviour is reached by concrete in tensile stress with a view to reaching a better understanding of the behaviour of concrete in flexural stress. This study is divided into two parts: (1) tensile tests at a constant rate of deformation. These tests showed that a post-critical behaviour could be obtained with wet concrete and that the linear mechanics of failure could not explain this behaviour. It was also noted that, for a similar mix design, dried concrete had a higher failure stress and a lower young modulus than the corresponding wet concrete; (2) study of acoustic emission under stress. The spectrum analysis of acoustic phenomena under load showed that it is possible to distinguish several types of spectrum, which leads to proposing a fissuration mechanism. Two stress limits corresponding to the onset of the two phenomena were determined: the first was the breakdown of cohesion between aggregates and mortar, the second was inter-aggregate cracking. It was also observed that cracking occurred in several zones of the sample. (TRRL)

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Terrien, M
  • Publication Date: 1980-1-2

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00325681
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Files: ITRD, TRIS
  • Created Date: Sep 16 1981 12:00AM