RELATIONSHIP OF PORE-SIZE DISTRIBUTION AND OTHER ROCK PROPERTIES TO SERVICEABILITY OF SOME CARBONATE AGGREGATES

THE PORE-SIZE DISTRIBUTION PRESENT IN SOME CARBONATE ROCKS WAS DETERMINED AS PART OF AN INVESTIGATION CONCERNED WITH THE PROPERTIES OF AGGREGATE WHICH AFFECT THE DURABILITY OF PORTLAND CEMENT CONCRETE. PORE-SIZE DISTRIBUTION IS CONSIDERED CRITICAL IN CONTROLLING FLOW AND RETENTION OF WATER IN AGGREGATE. THOSE PROPERTIES, IN TURN, MIGHT BE RELATED TO AN AGGREGATE'S EFFECT ON THE RESISTANCE OF CONCRETE TO FREEZING AND THAWING AND TO POTENTIAL CHEMICAL REACTIVITY OF THE AGGREGATE IN CONCRETE. PORE-SIZE DISTRIBUTIONS WERE DETERMINED BY USE OF A MERCURY CAPILLARY PRESSURE APPARATUS MANUFACTURED BY RUSKA INSTRUMENT CORPORATION, HOUSTON, TEXAS. SEVERAL OTHER PROPERTIES OF THE ROCKS WERE ALSO DETERMINED. THOSE PROPERTIES ARE: (1) EFFECTIVE POROSITY, (2) TOTAL POROSITY, (3) CALCIUM-TO- MAGNESIUM RATIO, (4) INSOLUBLE RESIDUE, (5) AMOUNT OF CLAY PRESENT, (6) LOSS IN WEIGHT IN FREEZING-AND-THAWING, (7) SERVICE RECORD, AND (8) TEXTURE. QUESTIONS ABOUT THE RELATIONSHIPS BETWEEN THE VARIOUS PROPERTIES WERE RAISED AND ANSWERED TENTATIVELY ON THE BASIS OF THE FREQUENCY OF OCCURRENCE OF THE PROPERTIES. THIS INVESTIGATION SHOWED: (1) A LARGE NUMBER OF THE ROCKS SAMPLED POSSESS PORE ENTRY DISTRIBUTIONS WITH MAXIMA IN THE REGION OF RADIUS LESS THAN, OR EQUAL TO, 0.5 MICRON, (2) KNOWLEDGE OF A ROCK'S PORE-SIZE DISTRIBUTION MIGHT BE OF VALUE IN ATTEMPTING TO PREDICT ITS SERVICE RECORD AS AGGREGATE, AND (3) THE FREQUENCY-OF- OCCURRENCE METHOD LENDS ITSELF WELL TO THE CHARACTERIZATION OF A ROCK. /AUTHOR/

Media Info

  • Monograph Title: Physical and chemical properties of cement and aggregate in concrete
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00217749
  • Record Type: Publication
  • Files: TRIS, TRB
  • Created Date: Aug 19 1994 12:00AM