REACTIONS BETWEEN ALKALIS AND AGGREGATES IN CONCRETE

LE POINT SUR LES REACTIONS ALCALIS-GRANULATS DANS LE BETONS HYDRAULIQUES

The reaction between alkalis and aggregates is the cause of swelling phenomena occurring in concrete. These phenomena happening over ten years or so may lead to serious disorders (cracking, displacements) in structures. A distinction is made between three types of reaction: alkali-silica reaction: the silica is dissolved by a basic solution consisting of the water present in concrete and alkalis in cement, and formation of silica or expansive alkaline silicate gels; alkali-silicate aggregate reaction: similar to the previous reaction and/or formation of swelling clay; alkali-carbonate aggregate reaction: the disappearance of the dolomite may aid contact between the water and swelling clay contained in aggregate particles. In contrast to a large number of countries, French administration is not fully aware of these problems and has not set up any regulations. Attention is drawn to the precautions to be taken when potentially reactive ingredients are used. /TRRL/

  • Corporate Authors:

    Laboratoire Central des Ponts et Chausees (LCPC)

    Boulevard Lefebvre 58
    Paris Cedex 15,   France  F-75732
  • Authors:
    • Lesage, R
    • Sierra, R
  • Publication Date: 1977-7-8

Language

  • French

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00194074
  • Record Type: Publication
  • Source Agency: Central Laboratory of Bridges & Highways, France
  • Files: ITRD, TRIS
  • Created Date: Jun 13 1979 12:00AM