OPEN AND CLOSED VOIDS IN CEMENT MORTAR AND THE INFLUENCE OF CHEMICAL AND MINERAL ADMIXTURES /IN GERMAN/

RESULTS ARE GIVEN OF A COMPARATIVE STUDY OF THE POROSITY OF MORTAR PRISMS MADE WITH PORTLAND CEMENT AND BLAST-FURNACE CEMENT VARYING IN THEIR MANUFACTURING PROCESS AND COMPACTION, WITH AND WITHOUT ADMIXTURES. STANDARD TEST METHODS AND THE BECKMAN PYCNOMETRIC METHOD WERE USED. (1) POROSITY (EXPRESSED AS A PECENTAGE OF THE VOLUME) DETERMINED BY THE BECKMAN METHOD CORRESPONDS TO THE POROSITY OBTAINED BY THE PRESSURE WATER ABSORPTOIN METHOD. (2) THE PYCNOMETRIC METHOD ENABLES PORE DISTRIBUTION TO BE ACCURATELY DETERMINED AS A PERCENTAGE. (3) THE DETERMINATION OF VOIDS SPACE FROM DENSITY GIVEN FAIRLY ACCURATE RESULTS ONLY WITH REGARD TO POROSITY. (4) BECAUSE OF A MARKED DIFFERENCE IN THE OVERALL POROSITY, CAPILLARY POROSITY AND COLLOIDAL POROSITY OF PORTLAND CEMENT AND BLAST-FURNACE CEMENT, IT IS NOT POSSBILE TO DETERMINE POROSITY FROM DENSITY IN ORDER TO COMPARE THE DEGREE OF COMPACTION OF HARDENED CEMENT MORTAR. (5) THE COMPRESSIVE STRENGTH OF HARDENED CEMENT IS DEFINED AS A LINEAR FUNCTION OF OPEN CAPILLARY POROSITY IN RELATION TO THE WATER/CEMENT RATIO. (6) THE PYCNOMETRIC METHOD FACILITATES THE QUANTITAVE DETERMINATION OF THE INFLUENCE OF CONCRETE ADMIXTURES. THIS EXPLAINS THE REACTION MECHANISM OF FLOUSILICATE AND AIR-ENTRAINING ADMIXTURES IN PORTLAND CEMENT MORTAR AND BLAST-FURNACE CEMENT MORTAR. THE ADDITION OF FLUOSILICATE RESULTS IN A REDUCTION IN THE QUANTITY OF WATER ADDED AND HAS A QUALITATIVE INFLUENCE ON THE STRUCTURE OF HARDENED CEMENT PASTE. /LCPC(A)/RRL/

  • Supplemental Notes:
    • No 4, pp 165-174, 7 FIG, 8 TAB, 19 REF
  • Authors:
    • Meier-grolman, F W
    • Dietrich, H
  • Publication Date: 1969-4

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Filing Info

  • Accession Number: 00213077
  • Record Type: Publication
  • Source Agency: Road Research Laboratory /UK
  • Files: TRIS
  • Created Date: Jun 1 1971 12:00AM