BASIC CHEMISTRY OF REACTIONS OF AGGREGATES IN PORTLAND CEMENT CONCRETE

THIS PAPER REVIEWS THE LITERATURE PERTAINING TO THE BASIC CHEMISTRY INVOLVED IN THE REACTIONS OF AGGREGATES WITH THE LIQUID PHASE OF PORTLAND-CEMENT CONCRETE, WHICH IS PRIMARILY AN AQUEOUS SOLUTION OF THE HYDROXIDES OF SODIUM, POTASSIUM, AND CALCIUM. IT POINTS OUT THE NEED, IN DEVELOPING EXPLANATIONS OF THE EFFECTS OF SUCH REACTIONS, OF STARTING WITH THE REACTION OF THE SOLID WITH THE IONS OF THE LIQUID PHASE PRIOR TO THE DISSOLUTION OF THESE REACTIONS PRODUCTS. THE PAPER OUTLINES THE MECHANISMS BY WHICH ALKALI-BEARING MINERALS MAY RELEASE ALKALIES TO THE LIQUID PHASE OF THE CONCRETE' SILICA REACTS AS A SOLID TO FORM SILICIC ACID, SILICA REACTS WITH SODIUM AND POTASSIUM HYDROXIDES TO FORM METASILICATES, AND MAGNESIUM CARBONATES REACT WITH ALKALI HYDROXIDES. THESE MECHANISMS ARE CORRELATED WITH THE BEHAVIOR OF AGGREGATES IN TERMS OF THE STRUCTURE OF HARDENED CEMENT PASTE. /AUTHOR/

  • Supplemental Notes:
    • Vol 2,no 2,PP 408-431
  • Authors:
    • Hansen, W C
  • Publication Date: 1967-6

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  • Accession Number: 00212431
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 1 1994 12:00AM