Thermal degradation of concrete in the temperature range from ambient to 315°C (600°F)

This report is concerned with determining the effect of elevated temperatures on the behavior of concrete. Emphasis is placed on quantifying the degree of potential degradation of the physical properties of concrete in high-level waste storage tanks. The temperature elevation range of interest is from ambient to 315°C (600°F). The literature has been reviewed to examine the applicable experimental data and quantify the degradation in the concrete and reinforcing steel. Since many variables and test conditions control the results in the data base, upper and lower bounds of the degraded properties at temperatures applicable to the environments of the storage tanks are summarized and presented in explicit forms. For properties with large data bases, a normal logarithmic distribution of the data is assumed and a statistical analysis is carried out to find the mean and 84% values of the degraded property in the temperature range of interest. Such results are useful in assessing the effect of elevated temperatures on the structural behavior of the tanks. In addition, the results provide the technical basis for a parametric study that may be necessary to investigate the thermal aspects of the structural integrity of the tanks. The original version of this report was published in June 1993. Since then additional test data of concrete properties at elevated temperatures, especially creep strain, have been added to the data base. This version of the report incorporates the statistical variations of those concrete properties for which significant amounts of experimental data have been reported. In addition, an empirical formula relating the creep strains at elevated temperatures to those at ambient temperture is provided.

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