Abstract
A series of tests was conducted to evaluate effects of sustained heating on the strengths of limestone aggregate concrete for the Clinch River Breeder Reactor Plant. Twenty-four 15.24-cm dia. by 30.48-cm long cylinders were divided into two groups subjected to either open-hot or closed-cold conditions. All specimens were heated for 14 days at soak temperatures of 450, 644, 839 and 1033 K. Unconfined compressive strengths were determined at these temperatures for the open-hot cylinders and after cooling for the closed-cold set. The results provided realistic upper and lower bounds for published strength data.
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