MEASUREMENT OF CONCRETE EXPANSIVE STRAINS DUE TO ALKALI-SILICA REACTION IN AUSTRALIAN CONCRETE STRUCTURES

The results of measuring the concrete expansive strains due to alkali silica reaction (ASR) are presented for 4 high strength concrete bridge structures (the Susan River, Sandy Creek, Tom Aitken and Brinagee Creek bridges). Details of the instrumentation, using Huggenberger strain gauges is provided for all 4 bridges, as is the range of climate conditions in the locations. All the bridges chosen are concrete bridges of the same type of cross section. ASR distress has been found almost exclusively in the prestressed steam cured concrete bridge beams, which contain polystyrene voids that can store substantial quantities of water, ensuring high internal humidity within the void. The concrete used in the manufacture of the beams is class 45 MPa/20 mm nominal aggregate size. The cement content is in the range of 450 to 500 kg per cubic metre with a resultant total alkali content expressed as sodium oxide equivalent in the range 3-4 kg per cubic metre. The Susan River and Sandy Creek bridge beams were made from a river gravel containing strained Quartzite and Chert. The Tom Aitken and Brinagee Creek bridge beams were made from concrete containing rhyodacitic tuff. The results show that some of the structures are expanding at significant rates at an age of 10 years, even though they are already severely cracked due to ASR. These data indicate that the concrete structures affected by ASR exhibit a maximum strain in the vicinity of 5000 microstrain after 12 years.

  • Availability:
  • Corporate Authors:

    Pergamon Press, Incorporated

    Maxwell House, Fairview Park
    Elmsford, NY  United States  10523
  • Authors:
    • CARSE, A
    • DUX, P F
  • Publication Date: 1990-5

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00606784
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Mar 31 1991 12:00AM