THE SULPHATE RESISTANCE OF FERRARI CEMENTS

THE SULPHATE RESISTANCE OF FERRARI CEMENT--WHICH CONTAINS NO TRICALCIUM ALUMINATE--WHEN INCORPORATED IN CONCRETE IS CONSIDERABLY DIMINISHED IF THE AGGREGATES CONTAIN MICACEOUS SCHIST OR IF THE CEMENT CONTAINS DISODIUM OXIDE NOT COMBINED IN SULPHATE FORM AND COMBINED MORE PARTICULARLY AS NITROGEN OCTOCALCIUM ALUMINATE. IN THE FORMER CASE THERE OCCURS CRYSTALLIZATION OF GYPSUM FROM SUPERSATURATED SULPHATE SOLUTIONS, NOT IN THE CEMENT PASTE MATRIX, BUT IN THE CLEAVAGE CRACKS OF THE MICA. IN THE LATTER CASE THERE IS PROBABLY A CHEMICAL REACTION BETWEEN CALCIUM ALUMINATE HYDRATES AND GYPSUM, AT LEAST AT THE START OF THE SULPHATE ATTACK. IT IS NOTEWORTHY THAT THE LACK OF SULPHATE RESISTANCE DUE TO NITROGEN OCTOCALCIUM ALUMINATE CAN BE OBVIATED IN THE SAME CEMENT BY ENSURING THAT THE ALKALIES IN THE CLINKER ARE COMBINED IN SULPHATE FORM. THE TEST RESULTS APPEAR TO INDICATE THAT, IN THE LATTER CASE, CALCIUM SILICATE PHASES CONTAINING DISODIUM OXIDE ALSO PLAY A ROLE IN CAUSING SUSCEPTIBILITY TO SULPHATE ATTACK. /AUTHOR/

  • Supplemental Notes:
    • Vol 57, No 3, PP 124-130
  • Authors:
    • Trojer, F
  • Publication Date: 1968-3

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  • Accession Number: 00212620
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 15 1994 12:00AM