CONTROLLING SHRINKAGE CRACKING IN RESTRAINED REINFORCED CONCRETE

This paper was presented at session 18 - structures. It points out that although drying shrinkage occurs in practically all reinforced concrete structures, so-called 'shrinkage cracking' is a problem only in lightly reinforced members not subjected to flexural action. The difference between flexural cracking and direct-tension cracking is discussed, the mechanisms of direct-tension cracking examined in detail and crack-prediction equations presented. Experimental comparisons between nine longitudinally- restrained walls containing various types and ratios of conventional reinforcement are briefly presented and predictions made of the (large) reinforcement ratios required to ensure satisfactory control of direct-tension cracking. The concept of 'strategic reinforcement' is then presented as a logical outcome of the tests with conventional reinforcement and a means of employing relatively small quantities of reinforcement to ensure a predetermined number of ('shrinkage') cracks of predictable width in a restrained member such as a road pavement or long retaining wall. Experimental verification of the principle is described. Finally, shrinkage cracking in thick members, and the effect of 'curing' on shrinkage cracking, are discussed. /TRRL/

Media Info

  • Features: Figures; References;
  • Pagination: p. 167-173
  • Serial:
    • Volume: 9
    • Issue Number: 4

Subject/Index Terms

Filing Info

  • Accession Number: 00303515
  • Record Type: Publication
  • Source Agency: ARRB Group Ltd.
  • Files: ITRD, TRIS, ATRI
  • Created Date: Mar 20 1980 12:00AM