POROSITY OF HARDENED PORTLAND CEMENT PASTES

CONTINUED STUDY OF THE PROPERTIES OF HARDENED PORTLAND CEMENT PASTES HAS PROVIDED INFORMATION WHICH MAKES IT POSSIBLE TO ESTIMATE POROSITY OF PASTES MORE PRECISELY THAN IS POSSIBLE BY USING THE ORIGINAL EQUATIONS OF POWERS AND BROWNYARD. THE TOTAL PORE VOLUME OF HARDENED PASTES IS 0.99W. CAPILLARY PORE VOLUME IS THE DIFFERENCE BETWEEN TOTAL PORE VOLUME AND PORE VOLUME CHARACTERISTIC OF THE GEL IN HARDENED PASTES. THE PORE VOLUME OF THE GEL IS ASSUMED TO BE THE LOWEST PORE VOLUME THAT HAS BEEN OBSERVED IN HARDENED PASTES. THE PASTE WITH THE LOWEST PORE VOLUME WAS MADE WITH W/C=0.235 AND CURED FOR 11 YEARS. THE GEL POROSITY CALCULATED FOR THIS PASTE IS 0.26. THE AVERAGE NUMBER OF LAYERS OF WATER MOLECULES ON THE SURFACE OF THIS SATURATED GEL IS 2.38. /PCA/

• Authors:
  • Copeland, L E
  • Hayes, J C
• Publication Date: 0

Media Info

• Serial:
  • Portland Cement Assoc R & D Lab Bull
  • Issue Number: 0

Subject/Index Terms

• TRT Terms: Gels; Hardness; Pastes; Pore space; Porosity; Portland cement
• Subject Areas: Highways; Materials;

Filing Info

• Accession Number: 00213517
• Record Type: Publication
• Source Agency: Portland Cement Association
• Report/Paper Numbers: No 68
• Files: TRIS
• Created Date: May 25 1970 12:00AM