Suitable intervention strategies for structures affected by alkali-silica reaction (ASR)

The purpose of this paper is to provide a review of the issues in relation to repairing bridge structures affected by alkali-silica reaction cracking. The bridge structures chosen cover problems with a superstructure and also a substructure. The superstructure example consists of an original section of 8 prestressed T girders and was subsequently widened in 1990 with 11 deck units on the Western side and 9 deck units on the Eastern side. All of the cracking previously identified by others was reported as being confined to the new deck units in both widening sections. Field inspection indicates the soffit of the deck units is very close to the high water mark in the tidal creek. As a result of the work performed in this report, Alkali-Silica Reaction (ASR) was determined as the primary mechanism causing the observed cracking in the prestressed deck units used in the widening of this bridge in 1990. An approach to the rehabilitation of this structure is outlined which had a degree of urgency in relation to the satisfactory long-term performance of this structure. (a) For the covering entry of this conference, please see ITRD abstract no. E211602.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01011230
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0855886986
  • Files: ITRD, ATRI
  • Created Date: Dec 19 2005 2:55PM