EXPERIMENTAL STUDY OF FRACTURE OF REINFORCED STEEL BAR IN CONCRETE STRUCTURES DUE TO ALKALI-SILICA EXPANSION

In recent years, a number of cases of damaged concrete structures attributable to alkali-silica reaction (ASR) or chloride-induced steel corrosion have been reported. Some ASR-affected concrete structures have been found to be in a severe condition when ASR expansion has continued for an extended period of time. An inspection of the footings of concrete piers was conducted and fractures at bends in steel bars on the edge of the footings was found. It was determined that the fractures were due to excessive ASR-induced expansion in the concrete. However, the mechanism of fracture of steel bars due to excessive ASR expansion is not clear. A model footing made with reactive aggregate was fashioned and tested, and the relationship between the ASR expansion and the stress of steel bars was examined. From experimental results, it was found that the stress at the bends in steel bars due to ASR expansion was attained at the yield point or beyond.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 637-652

Subject/Index Terms

Filing Info

  • Accession Number: 00964546
  • Record Type: Publication
  • ISBN: 0870311131
  • Report/Paper Numbers: SP-212-40
  • Files: TRIS
  • Created Date: Oct 15 2003 12:00AM