THE INFLUENCE OF PULVERIZED-FUEL ASH UPON THE HYDRATION CHARACTERISTICS AND CERTAIN PHYSICAL PROPERTIES OF A PORTLAND CEMENT PASTE

In order to examine the effects produced by the presence of pfa upon the hydration characteristics of an ordinary portland cement, comparisons were obtained using two equivalent pastes. One of these pastes was prepared with an ordinary portland cement and the other with a blend containing 30 parts by weight of pfa and 70 parts by weight of the opc. Both pastes were made so as to have a water to solids ratio of 0.47 by weight. The chemical composition and the physical characteristics of the starting materials are shown. The following quantitative measurements were made after 0.25, 0.5, 1, 1.5, 2, 7, 14, 28, 65, 100, 275 and 365 days hydration at room temperature: 1) compressive strength (at ages greater than 1.5 days); 2) total porosity (at ages greater than 1.5 days); 3) chemically bound water; 4) calcium hydroxide (portlandite) content; 5) hydration of the individual cement phases; 6) reaction of the "glassy" phase in the pfa. Two distinct mechanisms are shown to occur. At early ages the pfa does not make a strong contribution to strength but, as a fine powder, it accelerates the hydration of the cement. The pozzolanic reaction becomes apparent at normal temperature if curing has continued beyond fourteen days. (TRRL)

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/isbn/0721013244
• Corporate Authors:

  Cement and Concrete Association

  Wexham Spring
  Slough SL3 6PL, Buckinghamshire,   England 
• Authors:
  • DALZIEL, J A
  • Gutteridge, W A
• Publication Date: 1986

Media Info

• Features: Figures; References; Tables;
• Pagination: 28 p.
• Serial:
  • Cement and Concrete Association
  • Publisher: Research and Development Division

Subject/Index Terms

• TRT Terms: Calcium hydroxide; Cement paste; Chemical composition; Compressive strength; Concrete curing; Hydration; Physical properties; Porosity; Portland cement; Pozzolanic action; Pulverized fly ash
• Old TRIS Terms: Pulverized fuel ash
• ITRD Terms: 1757: Age; 7178: Calcium; 4758: Cement; 4767: Cement paste; 5532: Compression; 4702: Curing (concrete); 4580: Fly ash; 7195: Hydration; 7354: Hydroxide; 6136: Measurement; 4714: Mix design; 5938: Porosity; 4185: Pozzolan; 5544: Strength (mater); 6722: Temperature; 4355: Water
• Subject Areas: Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00466156
• Record Type: Publication
• Source Agency: Transport Research Laboratory
• ISBN: 0 7210 1324 4
• Report/Paper Numbers: Tech Rept 560
• Files: ITRD, TRIS
• Created Date: Mar 31 1988 12:00AM