OBSERVATIONS OF THE DEVELOPMENT OF FRACTURE ZONES IN CONCRETE. FRACTURE OF CONCRETE AND ROCK: RECENT DEVELOPMENTS. PAPERS PRESENTED AT THE INTERNATIONAL CONFERENCE, UNIVERSITY OF WALES, COLLEGE OF CARDIFF, SCHOOL OF ENGINEERING, SEPTEMBER 20-22, 1989

Concrete specimens have been tested in uni-axial tension using a closed loop servo-controlled testing machine. The combination of extension control and stiff testing frame has allowed stable failure to be achieved and the full post-peak portion of the load/extension relationship to be obtained. The full field surface strain of the specimen has been measured using Moire Interferometry. The development of fracture process zones has been observed, together with their effects on the surrounding material. Localisation in the strain field occurred prior to the attainment of the maximum load, with subsequent propagation during the post-peak portion of the load/extension relationship. It has been shown that the load/extension relationship is not a property of the bulk material but is strongly influenced by behaviour local to the fracture process zone. A simplified model which takes into account the propagation of the fracture process zones during the test is proposed. The model is based on a relationship between the opening of the zone and the stress transferred at one location in the specimen.(A) For the covering abstract of the conference see IRRD 829348.

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  • Corporate Authors:

    Elsevier Science Publishers

    Crown House, Linton Road
    Barking, Essex IG11 8JU,   England 
  • Authors:
    • RAISS, M E
    • Dougill, J W
    • Newman, J B
  • Publication Date: 1989

Language

  • English

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Filing Info

  • Accession Number: 00605962
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • ISBN: 1-85166-414-9
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM