ALKALI-AGGREGATE PHASE OF CHEMICAL REACTIVITY IN CONCRETE

THE PROGRESSIVE REACTION OF THE ALKALI AND AGGREGATE IN CONCRETE DEPENDS ON LIME TO LIBERATE THE ALKALI FROM THE ALKALI SILICATES BEFORE CONTINUING THE CYCLE. PROOF OF THIS REACTION CYCLE CAN BE CONDUCTED CHEMICALLY IN COMPARATIVELY SHORT PERIODS; HOWEVER, VERY CAREFUL CHEMICAL MANIPULATION IS NECESSARY. RESULTS FROM THE ANALYSIS OF THE CONCRETE GEL ARE IN ACCORDANCE WITH PROGRESSIVE-REACTION THEORY. THE ANALYSIS OF THE MORTAR BARS DISCLOSED LITTLE OR NO ALKALI SILICATES. THE PRESENCE OF FREE ALKALI, NEAR THE ORIGINAL PERCENT, DISPELLED THE POSSIBILITY THAT THE ALKALI SILICATES HAD ESCAPED. THE ACID-SOLUBLE SILICA IN THE MORTAR BARS VARIED DIRECTLY WITH THE ALKALI CONTENT AND TOTAL EXPANSION. THE CEMENT SHOWING THE HIGHEST EXPANSION IN THE MORTAR BARS CONTAINED THE HIGHEST MAGNESIA AS WELL AS THE HIGHEST ALKALI CONTENT. /AUTHOR/

  • Supplemental Notes:
    • Vol 32, pp 306-316, 7 TAB, 3 REF
  • Authors:
    • Hester, J A
    • Smith, O F
    • Halstead, W J
  • Discussers:
    • Chaiken, B
  • Publication Date: 1953

Media Info

  • Monograph Title: Proceedings of the Thirty-Second Annual Meeting of the Highway Research Board, Washington, D.C., January 13-16, 1953
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00213956
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 15 1971 12:00AM