CEMENT PERFORMANCE IN CONCRETE.
ARMY ENGINEER WATERWAYS EXPERIMENT STATION VICKSBURG MS
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Samples of 22 portland cements, consisting of types I, II, III, IV, and V from various sources, all of which had been studied by the Portland Cement Association PCA in its Long-Time Study of Cement Performance in Concrete LTS were furnished by PCA to the Waterways Experiment Station WES for testing. The purpose of the tests was to develop performance data on the different types of cement and, when possible, to compare the data developed with those obtained by PCA. A sample of each cement was sieved to determine the percentage of lumps formed during 10 years storage, and was then subjected to chemical analysis, physical tests, and heat of hydration tests. Air-entrained concrete mixtures were proportioned with each cement. Specimens were made for test in the freshly mixed and hardened condition. The effects of 10-year storage were found to be negligible. In general, test results compared well with those of PCA. Analysis of data on sulfate resistance and cracking resistance were made since these test methods had not previously been used in the LTS program. It was indicated that results of these two tests are influenced not only by the characteristics of the cement that might be expected to affect such performance, but also by the rate of reaction of the cement with water to develop hydration products and by strength and related attributes. Author
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