THE ASSOCIATION OF ETTRINGITE WITH THE CRACKING OF IN-SITU BRIDGE CONCRETE

When a maintenance engineer is faced with severely cracked concrete his investigation follows a well established procedure. His investigation will examine the five basic causes for cracking, structural damage, non structural action such as shrinkage and creep, thermal and frost action, reinforcement corrosion and chemical action. Matching the characteristic parameters for each of these mechanisms against those found on location will normally yield a diagnosis. This paper describes an investigation where the measured parameters led to the conclusion that a form of chemical action was at work, hitherto unrecognised in in-situ concrete. Measurements taken from the substructures of three bridges are compared with such published data as exists. The questions of further cracking and long term expansion are examined. The absence of ASR gel but the presence of ettringite crystals in the cracks and voids is reported and correlated with expansion test results. (A) For the covering abstract see IRRD 882313.

Language

  • English

Media Info

  • Features: References;
  • Pagination: p. 219-24

Subject/Index Terms

Filing Info

  • Accession Number: 00729465
  • Record Type: Publication
  • Source Agency: Transport Research Laboratory
  • ISBN: 0-419-21210-8
  • Files: ITRD
  • Created Date: Dec 26 1996 12:00AM