APPROACH TO FUNDAMENTALS OF CONCRETE STRENGTH

EXPERIMENTAL EVIDENCE HAS INDICATED THAT THE ANHYDROUS CLINKER PHASES AND CALCIUM OXIDE SULFITE HYDRATE INTERACT DURING HYDRATION. THE PRINCIPAL REACTION PRODUCT IS A COMPLEX CALCIUM SILICATE HYDRATE CONTAINING IN ITS LATTICE SUBSTANTIAL OR MAJOR PORTIONS OF THE ALUMINA, FERRIC OXIDE, AND SULFITE PRESENT IN CEMENT. DATA HAVE NOT YET BEEN PUBLISHED RELATING LATTICE SUBSTITUTION TO PHYSICAL PROPERTIES OF NORMALLY CURED CONCRETE. THE PRESENT STUDY WAS IN PART DESIGNED TO OBTAIN EVIDENCE ON SUCH A POSSIBILITY. IN THE EXPERIMENTS, HYDRATED PASTES OF TRICALCIUM SILICATE OR ALITE WERE PREPARED WITH DIFFERENT AMOUNTS OF INTEGRALLY BOUND SODIUM TRIOXIDE ADDED AS GYPSUM. STRENGTH DECREASED CONTINUOUSLY WITH INCREASED SODIUM TRIOXIDE CONTENT ABOVE ABOUT 1%. ADDITIONS OF ALUMINA INTO THE LATTICE INCREASED THE OPTIMUM SODIUM TRIOXIDE CONTENT TO EITHER 1.0--1.5 OR 2.5--3.0%. SEVERAL SERIES OF PASTES UNDERWENT MARKED STRENGTH RETROGRESSIONS AT CERTAIN SODIUM TRIOXIDE CONTENTS. THESE STRENGTH LOSSES ARE ASCRIBED TO MICROFLAWS WHICH MAY BE CAUSED BY INTERNAL STRAINS.

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  • Supplemental Notes:
    • Vol 1, No 1, PP 63-73, 2 FIG, 2 TAB, 15 REF
  • Authors:
    • Kalousek, G L
    • Kopanda, J E
  • Publication Date: 1971-1

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Filing Info

  • Accession Number: 00214019
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 3 1971 12:00AM