FORMATION OF CALCIUM SULFOALUMINATE DURING THE HYDRATION OF SUPERSULFATED CEMENT AS RELATED TO THE PROPERTIES OF THE HARDENED CEMENT PASTE

THE FORMATION OF THE HYDRATED CALCIUM SULFOALUMINATE FROM SUPER SULFATED CEMENTS WITH VARIOUS LIME CONTENTS WAS INVESTIGATED BY X-RAY, DTA, ELECTRON MICROSCOPE, POLARIZED MICROSCOPE, AND CHEMICAL ANALYSIS. RESULTS SHOW THAT ETTRINGITE, THE ESSENTIAL PRODUCT OF HYDRATION, IS FORMED GRADUALLY IN CEMENT PASTE. ITS AMOUNT, SHAPES, AND RATE AND PLACE OF FORMATION IN THE CEMENT PASTE DEPEND ON THE LIME CONTENT OF THE CEMENT WHICH EXPLAINS WHY SUPERSULFATED CEMENTS WITH DIFFERENT LIME CONTENTS SHOW DIFFERENT CHARACTERISTICS IN THE DEVELOPMENT OF STRENGTH AND EXPANSION . AS THE RATE OF FORMATION OF ETTRINGITE DECREASES AT LATER AGES, THE PROBLEM OF VOLUME CONSTANCY OF SUPERSULFATED CEMENTS WITH EXCESSIVE LIME CONTENT AND CURED FOR A LONG TIME IN WATER IS DISCUSSED. THE AUTHORS CONCLUDE THAT IN ACTUAL PRACTICE, A REASONABLY EXCESSIVE ADDITION OF PORTLAND CEMENT CLINKER TO THE MIX IS PERMISSIBLE TO IMPROVE CERTAIN PROPERTIES OF THE CEMENT. HARDENED SUPERSULFATED CEMENT MAY BE USED IN CONTACT WITH PORTLAND CEMENT EVEN IN MOIST CIRCUMSTANCES, BUT THE TWO TYPES MUST NOT BE USED TOGETHER IN THE MIX. /SOURCE/

  • Supplemental Notes:
    • Vol 4, No 1, PP 11-21
  • Authors:
    • CHENG, S
    • Miou, C
  • Publication Date: 1965

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  • Accession Number: 00212319
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Feb 20 1994 12:00AM