PHYSICAL PROPERTIES AND STRUCTURE OF FRESH CEMENTITIOUS PASTES

AN INVESTIGATION WAS CONDUCTED TO DETERMINE THE IMPORTANCE OF THE DIFFERENCES IN THE STRUCTURE OF FRESH PASTES OF DIFFERENT CEMENTITIOUS MATERIALS IN COMPARISON WITH PORTLAND CEMENT AND HOW THESE MAY BE REFLECTED IN THE PROPERTIES OF THE HARDENED PASTES. THE BLEEDING CHARACTERISTICS AND RHEOLOGICAL BEHAVIOR OF FRESH PASTES WERE STUDIED TO ELUCIDATE INFORMATION ON THE PHYSICAL STRUCTURE OF PASTES OF POZZOLANIC AND SLAG CEMENTS AND MIXES OF LIME WITH SLAG OR POZZOLANA. THE STUDY OF THE BLEEDING AND RHEOLOGICAL CHARACTERISTICS HAS SHOWN IMPORTANT DIFFERENCES IN THEIR STRUCTURE FROM THAT OF PORTLAND CEMENT PASTE. A COMPARISON OF THE VALUES OF IMMOBILE WATER PER UNIT VOLUME OF PASTE, AND THE MINIMUM WATER-CEMENT RATIO, SHOWED THAT CEMENT REPLACEMENTS LOWERED THE DEGREE OF FLOCCULATION, STRENGTH OF THE FLOC STRUCTURE AND POROSITY OF THE SEDIMENT. THE APPARENT VISCOSITY AND YIELD VALUES OF THE PASTE WERE ALSO LOWERED. THE STRUCTURE OF THE POZZOLANIC AND SLAG CEMENT PASTES APPEARED TO BE GREATLY INFLUENCED BY THE PHYSICAL CHARACTERISTICS OF THE REPLACEMENTS, THE PARTICLE SHAPE HAVING A STRONG INFLUENCE. A SIMILAR CONCLUSION WAS REACHED IN RESPECT TO THE STRUCTURE OF THE FRESH PASTES OF MIXES OF LIME WITH EITHER POZZOLANA OR SLAG. THOUGH THE VALUES OF THE POROSITY OF SEDIMENTS OF FRESH PASTES OF POZZOLANIC AND SLAG CEMENTS WERE CONSIDERABLY LOWER THAN THAT OF PORTLAND CEMENT PASTE, THE MEAN PORE SIZE WAS GREATER. FOR REDUCING PORE SIZE IN THE PASTES OF POZZOLANIC AND SLAG CEMENTS, GRINDING OF REPLACEMENTS TO THE SPECIFIC SURFACE OF THE PORTLAND CEMENT ON VOLUME BASIS INSTEAD OF WEIGHT BASIS IS SUGGESTED.

• Record URL:
  http://onlinepubs.trb.org/Onlinepubs/sr/sr90/90-002.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:
  • CHOPRA, S K
• Publication Date: 1966

Media Info

• Features: References; Tables;
• Pagination: pp. 9-17
• 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: Alternatives analysis; Bleeding; Bonding; Calcium oxide; Cement; Equipment replacement; Flocculating agents; Moisture content; Particles; Pastes; Physical properties; Pores; Porosity; Portland cement; Pozzolan; Rheological properties; Shape; Size; Slag cement; Structural analysis; Viscosity; Volume; Water cement ratio
• Uncontrolled Terms: Pores; Replacement
• Old TRIS Terms: Cementing materials; Flocculating; Particle shapes
• Subject Areas: Highways; Maintenance and Preservation; Materials;

Filing Info

• Accession Number: 00212463
• Record Type: Publication
• Files: TRIS, TRB
• Created Date: Nov 18 2001 12:00AM