STUDY ON CRACKING DAMAGE OF A CONCRETE STRUCTURE DUE TO ALKALI-SILICA REACTION --PROCEEDINGS OF THE 7TH INTERNATIONAL CONFERENCE ON CONCRETE ALKALI-AGGREGATE REACTIONS, OTTAWA, CANADA, 1986

In 1982, a new type of cracking was found on the surface of concrete piers in osaka, Japan. Various investigations on concrete cores taken from the piers have been carried out and the cause of cracking was determined to be alkali silica reaction. This paper introduces a part of the investigations and the characteristics of the reaction. The tests were as follows: (a) measurement of the expansion of the concrete cores and observation of exuded gel. Drilled cores were stored in a wet room at 20 deg c and the strains due to expansion measured periodically until they converged. Then the cores were placed in a room at 40 deg c and 100% relative humidity to obtain the residual expansion. Observation of exuded gel was made at the same time; (B) mineralogical inspection investigation of rock types were performed on the aggregates taken from the cores; (c) alkali and chlorine contents of the concrete were measured by the hot water extraction method; and (d) observations of reaction rims around the reacted aggregates and the exuded gel were performed by optical microscope. It was found that a significant amount of alkali was provided to the concrete by the cristobalite and volcanic glass in the aggregate. There existed a pessimum for one reactive rock (rock a) of 2.5 to 5 mm grain size and for water soluble alkali with respect to the expansion of concrete made with reactive aggregate. For the covering abstract of the conference see IRRD 811982.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0815511426
• Corporate Authors:

  NOYES PUBLICATIONS

  MILL ROAD
  Park Ridge, NJ  United States 
• Authors:
  • MIZUMOTO, Y
  • KOSA, K
  • Ono, K
  • Nakano, K
• Publication Date: 1987

Language

• English

Media Info

• Pagination: p. 204-9
• Serial:
  • Publication of: NOYES PUBLICATIONS
  • Publisher: NOYES PUBLICATIONS

Subject/Index Terms

• TRT Terms: Alkali; Bridge piers; Chemical reactions; Colloids; Concrete; Conferences; Cracking; Evaluation and assessment; Expansion; Oxides; Samples; Silicon
• Uncontrolled Terms: Causes
• Geographic Terms: Japan
• Subject Areas: Data and Information Technology; Planning and Forecasting;

Filing Info

• Accession Number: 00481143
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• ISBN: 0-8155-1142-6
• Files: ITRD, TRIS
• Created Date: Apr 30 1989 12:00AM