CALORIMETRIC STUDY OF FREEZABLE WATER IN CEMENT PASTE

This article describes an investigation into the effect of the freeze thaw cycle on younger cement pastes in both the presence and absence of a deicer. Thin specimens of cement paste were subjected to freeze-thaw cycling in a differential scanning calorimeter in the temperature range of plus 20 deg c to minus 40 deg c at the scanning rate of 0.31 deg c/minute. Three water cement ratios of 0.50, 0.36 and 0.30 were chosen. Tests were conducted at the ages of 1, 7 and 28 days. A time-step-technique was used to evaluate the quantities of ice formed. The following conclusions were drawn: (a) specimens, if unsealed, lose a significant quantity of freezable water; hence, sealing the specimens is essential; (b) in the case of sealed water cured specimens, moderate increases were found in the freezable water with each freeze-thaw cycle; (c) drying and resaturation increased the quantity of freezable water; (D) when a deicer solution was the pore fluid, although the temperatures of incipient freezing remained relatively unchanged, two exothermic peaks were observed on warming in contrast to the single peak observed with water cured specimens.

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• Corporate Authors:

  Pergamon Press, Incorporated

  Maxwell House, Fairview Park
  Elmsford, NY  United States  10523
• Authors:
  • Banthia, N
  • Pigeon, M
  • Lachance, L
• Publication Date: 1989-11

Language

• English

Media Info

• Pagination: p. 939-950
• Serial:
  • Cement and Concrete Research
  • Volume: 19
  • Issue Number: 6
  • Publisher: Elsevier
  • ISSN: 0008-8846
  • Serial URL: http://www.sciencedirect.com/science/journal/00088846

Subject/Index Terms

• TRT Terms: Cement paste; Concrete; Deterioration; Freeze thaw durability; Heat; Measuring instruments; Mix design
• ITRD Terms: 6155: Apparatus (measuring); 4767: Cement paste; 4755: Concrete; 5255: Deterioration; 2577: Freezing thawing cycle; 6743: Heat; 4714: Mix design
• Subject Areas: Design; Materials;

Filing Info

• Accession Number: 00498871
• Record Type: Publication
• Source Agency: Transport and Road Research Laboratory (TRRL)
• Files: ITRD, TRIS
• Created Date: Sep 30 1990 12:00AM