DETERIORATION OF LIGHTWEIGHT FLY ASH CONCRETE DUE TO GRADUAL CRYOGENIC FROST CYCLES

Although the mechanical properties of a high strength lightweight concrete containing fly ash were shown to improve at cryogenic temperatures, its susceptibility to repetitive cryogenic frost cycles still must be evaluated. Longitudinal thermal strains of water-saturated and air-dried concretes were monitored between 65 and -250 F. Cumulative drops in compressive and splitting tensile strengths were measured after each of 5 gradual freeze-thaw cycles ranging from a high of 65 F to two low temperatures of -40 and -100 F. This was done to evaluate the concrete's frost durability at liquified petroleum and natural gas temperatures, respectively. As expected, moist concrete exhibits larger dilation and residual strains than air-dried concrete. The study results are discussed, particularly with regard to the coefficients of thermal length changes, compresive strengths, and the splitting tensile strength.

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  • Accession Number: 00610775
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 31 1991 12:00AM