EFFECTS OF COOLING RATES ON THE DURABILITY OF CONCRETE

Past research generally assumed that rapid cooling rates cause faster deterioration of concrete that is susceptible to damage from freezing and thawing. The objective of this project was to investigate the effect of varying freezing rates on an otherwise standard ASTM test. Eighty-one concrete specimens were fabricated with an aggregate capable of causing deterioration under freezing-and-thawing conditions. The aggregates were placed in the concrete at 3 different degrees of saturation. Three rates of cooling were used: 4.4 F/hour (2.45 C/hour); 6.6 F/hour (3.67 C/hour); and 13.3 F/hour (7.39 C/hour). Modifications to freezing and thawing equipment are described, and possible explanations of the results obtained are presented. If the aggregate was not initially saturated when placed in the concrete, slower freezing rates produced demonstrably faster rates of deterioration. It is theorized that a slower rate of cooling enables more water to migrate to the surroundings of the coarse aggregate. Therefore, during the thawing phase, more water is available for the coarse aggregate to become increasingly saturated. Rate of cooling seemed not to affect the rate of deterioration of concrete aggregates placed in the concrete already in the saturated state.

Media Info

  • Media Type: Print
  • Features: Figures; References;
  • Pagination: pp 8-19
  • Monograph Title: Corrosion, concrete, quality control and paint beads
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00126828
  • Record Type: Publication
  • ISBN: 0309023904
  • Files: TRIS, TRB
  • Created Date: Dec 16 1975 12:00AM