Condition assessment of an 8-year old freeway bridge, its load capacity and rehabilitation assessment

Representative elements of the bridge were cored and investigated for possible cause(s) of deterioration. The results presented in this paper discount alkali-aggregate reaction as a cause of cracking at the present time. Three possible mechanisms of distress were identified for this bridge, namely, (a) mechanical overloading causing structural cracking of pier crossheads (and possibly columns); (b) drying shrinkage and (c) cyclic thermal stresses, contributing to the cracking of the columns and external surfaces of the edge beams. The observed cracking, caused by these mechanisms, probably arose from inadequate material formulation, concrete mixing and placement practices. The results of load capacity assessment and recommended rehabilitation are also presented, including carbon fibre strengthening and re-coating with anti-carbonation and finally antigraffiti coatings. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.

Language

  • English

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Filing Info

  • Accession Number: 01011326
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 3:02PM