EFFECT OF SORBED WATER ON SOME MECHANICAL PROPERTIES OF HYDRATED PORTLAND CEMENT PASTES AND COMPACTS

THE EFFECT OF SORBED WATER ON MECHANICAL PROPERTIES OF PORTLAND CEMENT PASTES AND COMPACTS WAS OBSERVED. THIN DISCS OF NORMAL CEMENT PASTE WERE CUT FROM 1.25-IN. DIAMETER CYLINDERS WITH 0.3 TO 0.7 W/C RATIOS. COMPACTS OF SIMILAR SHAPE WERE PREPARED FROM BOTTLE-HYDRATED CEMENT AT PRESSURES OF 15,000, 40,000 AND 110,000 PSI. ALL SAMPLES WERE CONDITIONED TO DIFFERENT RH LEVELS BETWEEN O AND 98%. AT ALL LEVELS, THE MODULUS OF ELASTICITY OF ALL SAMPLES AND THE STRENGTH OF SOME WERE DETERMINED BY A MINIATURE TESTING MACHINE. SAMPLES WERE CONDITIONED OVER NAOH SOLUTIONS AND MEASURED IN GLOVED CONDITIONING BASES TO AVOID CARBONATION. INCREASES IN ELASTIC MODULUS WERE OBSERVED ONLY ABOVE 50% RH. THE INCREASE WAS MAINTAINED ON DESORPTION AND APPEARED TO BE ASSOCIATED WITH ENTRY OF INTERLAYER WATER IN THE TOBERMORITE GEL. MAXIMUM FRACTURE-STRENGTH FOR SAMPLES OF GIVEN POROSITY WAS ATTAINED AT 0% RH, AND LARGEST STRENGTH REDUCTION WAS OBSERVED FROM 0 TO 15% RH. PLOTS OF YOUNGS MODULUS VS POROSITY AND FRACTURE-STRENGTH VS POROSITY GAVE COMMON CURVES FOR COMPACTS AND PASTES.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-007.pdf
• Supplemental Notes:
  • Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Corporate Authors:

  Highway Research Board (HRB)

  Washington, DC   
• Authors:
  • Sereda, P J
  • FELDMAN, R F
  • Swenson, E G
• Publication Date: 1966

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 58-73
• Monograph Title: Symposium on structure of Portland cement paste and concrete
• Serial:
  • Highway Research Board Special Report
  • Issue Number: 90
  • Publisher: Highway Research Board

Subject/Index Terms

• TRT Terms: Mechanical properties; Modulus of elasticity; Pastes; Porosity; Portland cement; Samples; Sorption; Strength of materials; Testing equipment; Water
• Uncontrolled Terms: Observation
• Old TRIS Terms: Compacts
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00212298
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 18 1994 12:00AM