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The thermal properties of concrete aggregates are of greater or lesser concern to the user, depending upon the nature of the concrete structure and the exposure to which it is subjected. Examples of where knowledge of thermal properties are of greater concern are in the design of massive structures, such as dams, where thermal and volume stability are important and in lightweight concrete structures where insulating value is a primary factor. Except for thermal coefficient of expansion, the thermal properties of the aggregates used in normal concrete structures, such as office buildings, warehouses, pavements, and the like, seldom are considered. An understanding of the effects of the thermal properties of aggregates on the properties of concrete can have an effect on improving concrete quality and in some instances may well be mandatory.
Consulting engineer, Cleveland, Ohio