THE DETECTION OF ALKALI-SILICA REACTIONS IN CONCRETE STRUCTURES

BETONBAUWERKEN ZUM ERKENNEN VON ALKALI-KIESELSAEURE-REAKTIONEN IN CONCRETE STRUCTURES

Alkali-silica reaction (reaction of alkali in cement with specially reactive silica in aggregates) can damage concrete. This article describes the conduct and results of physico-chemical and mineralogical investigations on cores extracted from structures damaged by alkali. The expansion of the samples after extraction is a measurement of the real deterioration. The remaining deterioration can only be observed by curing tests. Reactive aggregates can be made to be detected and counted for evaluating deterioration. Because of the distribution and very irregular dimensions of reactive aggregates, the deterioration observed is different from structure to structure. Research has confirmed that high-quality concrete is most prone to deterioration. The long duration of the reaction was also confirmed by 7 year observations. During tests for the chemical cleaning of damaged concrete it was observed that silicate and alkaline chloride caused new marked expansion. Treatment with baryta water always showed positive results. (TRRL)

  • Corporate Authors:

    Bauverlag GmbH

    Wittelbacherstrasse 10
    6200 Wiesbaden,   Germany 
  • Authors:
    • Lenzner, D
    • Ludwig, U
  • Publication Date: 1979-8

Language

  • German

Media Info

  • Features: Figures; Photos; References;
  • Pagination: p. 401-410
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00324641
  • Record Type: Publication
  • Source Agency: Laboratoire Central des Ponts et Chausees (LCPC)
  • Files: ITRD, TRIS
  • Created Date: Aug 15 1981 12:00AM