LARGE GIRDERS SUBJECTED TO ALKALI-SILICA REACTION

An experimental study is currently being conducted to validate a methodology of mechanical reassessment of real structures damaged by alkali-silica reaction (ASR) based on residual expansion tests on cores. A main aim of the study is to point out the water driving effect on structural swelling. Three-meter-long girders were submitted to a unidirectional moisture gradient, causing a deformation gradient. A number of tests on companion cylinders and prisms were undertaken to determine material expansion and mechanical characteristics. This paper focuses on measurements obtained during the first year of drying: variation of water content, followed by precise weighing, and gammadensitometry; relative humidity measurements; local and global deformations; and deflection of the beams. Thus, water effects on the behavior of structures damaged by ASR can be documented and methodology of computing structural deformations to ASR using strains measured on prisms and cylinders can be validated.

Language

  • English

Media Info

  • Features: Figures; Photos; References; Tables;
  • Pagination: p. 299-318

Subject/Index Terms

Filing Info

  • Accession Number: 00964520
  • Record Type: Publication
  • ISBN: 0870311131
  • Report/Paper Numbers: SP-212-20
  • Files: TRIS
  • Created Date: Oct 12 2003 12:00AM