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Title: Analyses of check-test results of pozzolan samples
Authors: United States. Army. Office of the Chief of Engineers.
Pepper, Leonard.
Keywords: Pozzolan samples
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Technical report (U.S. Army Engineer Waterways Experiment Station) ; C-73-1.
Description: Technical report
Abstract: Periodic duplicate sampling and check testing of pozzolans were instituted by the Office, Chief of Engineers (OCE), during the latter part of 1958. The last set of duplicate samples was tested in January 1965. During this period 43 sets of duplicate samples were obtained by four different Corps of Engineers laboratories from seven different producers and tested by the sampling laboratory and the U. S. Army Engineer Waterways Experiment Station (WES). Three Corps of Engineers laboratories initiated during March 1967 an interlaboratory program to compare their test results of the same pozzolan sample. This program continued until May 1970. During this period 27 samples were tested by the three laboratories. All the above-mentioned test data were analyzed statistically; results are as follows. The test precision for 12 of the 16 tests evaluated in this study is the same as that obtained in testing portland cement, or for those tests which are not used in testing portland cements, does not exceed the calculated expected error. The four tests having higher error standard deviations than those found 1n testing portland cement are: Si02 + Al203 + Fe203, S03, ignition loss, and available alkalies. The test procedures used for determination of Si02 + Al203 + Fe203 and available alkalies in pozzolans differ from those used in testing portland cements, and the differences are such that higher error standard deviations can be expected in testing pozzolans. However, the test procedures used for the determination of S03 and ignition loss in pozzolans are the same as those used in testing Portland cement; therefore, the higher err or standard deviations obtained for these two tests when applied to pozzolans are probably due to the greater heterogeneity of pozzolans and the particular composition of pozzolans. A significant laboratory effect was found for eight of the 16 tests: Si02 + A1203 + Fe203, fineness, specific gravity, mean particle diameter, lime-pozzolan strength, water requirement both as a percent of control and percent increase in flow, and available alkalies. Some evidence for laboratory bias was found in two of the 16 tests: moisture loss and mean particle diameter. However, the test results in the interlaboratory study indicate that the tendency for bias in these two tests has been corrected.
Rights: Approved for public release; distribution is unlimited.
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