Effects of Temperature Changes on Concrete as Influenced by Aggregates
Stanton Walker, D. L. Bloem and W. G. Mullen
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Summarizes tests of concrete and mortar exposed to water and air tempera-tures ranging from 40-140 F with varying rates of change in temperature. Changes in length, weight, dynamic modulus and flexural strength were measured on specimens containing several different fine and coarse aggregates having thermal coefficients of expansion ranging from relatively low to relatively high. Principal findings of the tests were: thermal coefficients of ex-pansion of concrete and mortar containing different aggregates varied approxi-mately in proportion to the thermal coefficient and quantity of aggregate in the mixture; an approximation of the thermal coefficient of expansion of aggregate may be made from determinations of the thermal coefficients of concrete of varying proportions; changes in temperature were destructive to the concrete with sudden changes being much more severe than slower ones; and concretes having higher coefficients of expansion were less resistant to temperature changes than concretes with lower coefficients. No relationship was found between resistance of concrete to temperature changes and differences between thermal coefficknts of aggregates and mortar.