United States Department of Transportation
i
Durability of lightweight concrete : Phase I : concrete temperature study.
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1968-08-01
[PDF-762.21 KB]
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Alternative Title:Durability of lightweight concrete : Phase I : concrete temperature study : Louisiana highway research.
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Abstract:This report describes a study conducted to determine the temperature gradient throughout the depth of a six inch concrete bridge deck. The bridge deck selected for study was constructed using lightweight concrete for the center spans and sand and gravel concrete for the remaining spans. This enabled us to determine the difference, if any, in the temperature gradient for the two types of concrete.
Thermocouples were placed in the concrete at one inch intervals beginning one-half inch from the top of the slab with the last point being one-half inch from the bottom of the slab. A continuous recording was made of the thermocouples were used to record air temperature. A one year cycle of temperatures were recorded and analyzed.
The results of the study indicated that lightweight concrete has a greater temperature differential from top to bottom than does sand and gravel concrete, although the top one-half inch of both concretes were usually at the same temperature. The average maximum differential between the top one-half inch and the bottom one-half inch was 26 degrees for the lightweight concrete and 13 degrees for the sand and gravel concrete. In addition, there was 41 days during which freezing temperatures occurred in both concretes. However, the interior of the lightweight concrete was normally two to three degrees warmer than the sand and gravel concrete.
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