MISCELLANEOUS OBSERVATIONS ON THE ALKALI-AGGREGATE REACTION AND THE IONIC CHARGE ON HYDRATED CEMENT

IT HAS BEEN DEMONSTRATED BY AN INTERFEROMETRIC TECHNIQUE THAT CALCIUM HYDROXIDE HAS AN INHIBITING EFFECT ON THE ALKALI AGGREGATE REACTION, AND IT HAS ALSO BEEN DEMONSTRATED THAT OPAL MAY BE CAUSED TO SWELL IN THE ABSENCE OF ANY CEMENT MEMBRANE. THE FACT THAT AGGREGATES ARE ATTACKED MORE RAPIDLY IN A SETTLING CEMENT SLUDGE THAN IN THE SUPERNATANT LIQUID HAS BEEN EXPLAINED BY THE HIGHER PH VALUES IN THE SLUDGE. THE MAGNITUDE AND POLARITY OF THE EXCESS IONIC CHARGE ON VARIOUS PORTLAND CEMENTS HAS BEEN DETERMINED BY A PROCEDURE WHICH USED THE SILVER-AMMONIA-BROMIDE COMPLEX AS THE INDICATOR ION, AND IT APPEARS THAT THIS IONIC CHARGE MAY BE A CONTRIBUTING FACTOR IN THE SWELLING AND SHRINKING OF HYDRATED CEMENT. /AUTHOR/

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  • Accession Number: 00217763
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Sep 16 1994 12:00AM