Confinement of AAR expansion in cylindrical reinforced columns by CFRP wrapping

Bridge columns and beams are amongst the elements affected by alkali-aggregate reaction (AAR). A potential repair is wrapping of affected element by epoxy-bonded carbon fibre reinforced polymer (CFRP). A previous investigation by the authors on CFRP-wrapping of AAR-affected square columns showed that the wrapping reduced the expansion rate, but did not stop it. This was attributed to (a): Square shape of columns, not providing full confinement on the sides of columns, and (b): Application of only one layer of normal-modulus (240GPa) CFRP, rather than multiple layers of higher modulus (640 GPa) CFRP. The present investigation employed circular-section columns and multiple layers of CFRP (240 and 640 GPa). Expansion was measured in vertical and horizontal directions in concrete, on reinforcement bars and on CFRP. the effects of column shape, CFRP modulus and number of layers on the confinement of AAR expansion are discussed in relation to the repair of AAR-affected columns.

Language

  • English

Media Info

  • Pagination: 10p
  • Monograph Title: 14th International Conference on Alkali-Aggregate Reaction, May 20-25 2012, Austin, Texas, USA

Subject/Index Terms

Filing Info

  • Accession Number: 01593991
  • Record Type: Publication
  • Source Agency: ARRB
  • Files: ATRI
  • Created Date: Mar 21 2016 11:48AM