GENERALIZED LOG-NORMAL DISTRIBUTION OF PORE-SIZES IN HYDRATED CEMENT PASTE

PORE-SIZE DISTRIBUTIONS OF HARDENED CEMENT PASTES, AS DETERMINED BY MERCURY POROSIMETRY, ARE SHOWN TO BE GENERALIZED LOG-NORMAL DISTRIBUTIONS BOUNDED BY THE EXISTENCE OF A MAXIMUM BUT NOT A MINIMUM DIAMETER. AN EXCELLENT FIT IS FOUND FOR PASTES OF 0.4 AND 0.6 WATER--CEMENT RATIO AND AGES BETWEEN ONE DAY AND ALMOST ONE YEAR. THE CUMULATIVE DISTRIBUTION IS DESCRIBED IN TERMS OF THREE PARAMETERS: THE LIMITING UPPER BOUND DIAMETER DL AND TWO PARAMETERS, D BAR AND SIGMA, DESCRIBING THE GEOMETRIC MEAN AND STANDARD DEVIATION, RESPECTIVELY, OF THE GENERLIZED LOG NORMAL DISTRIBUTION. DL AND D BAR ARE FUNCTIONS OF THE WATER-- CEMENT RATIO; THEY DECREASE WITH AGE UP TO ABOUT TWO MONTHS AND ARE THEN REASONABLY CONSTANT. INTRUSION DATA TAKEN AT PRESSURES OF 50,000 PSI, CORRESPONDING TO DIAMETERS OF THE ORDER OF 25 ANGSTROMS, SUBSTANTIATE THE CONCLUSION THAT ALL OF THE PORES INTRUDED BELONG TO A SINGLE PORE-SIZE DISTRIBUTION; NO EVIDENCE OF BI- MODALITY (I.E., THE EXISTENCE OF A SEPARATE CLASS OF GEL PORES) IS OBSERVED. /AUTHOR/

  • Supplemental Notes:
    • No 4, 31 Pp, 8 FIG, 2 TAB, 16 REF
  • Corporate Authors:

    Purdue University/Indiana Department of Transportation JHRP

    Purdue University, School of Civil Engineering
    West Lafayette, IN  United States  47907-1284
  • Authors:
    • Diamond, S
    • Dolch, W L
  • Publication Date: 1971-2

Subject/Index Terms

Filing Info

  • Accession Number: 00213999
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Oct 3 1971 12:00AM