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Title: Laboratory tests of concrete aggregate and riprap for New Lock and Dam No. 26
Authors: United States. Army. Corps of Engineers. St. Louis District.
Tynes, W. O. (William O.)
Hallford, Charles R.
Keywords: Concrete aggregates
Laboratory tests
Lock and Dam No.26, Mississippi River
Publisher: Concrete Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
Series/Report no.: Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; C-72-4.
Description: Miscellaneous paper
Abstract: Ledge rock from three commercial sources was tested for suitability for use as riprap, and material from one of the sources of ledge rock plus crushed aggregate were also tested for use as concrete coarse aggregate. Drilled 6-in.-diameter cores from two commercial sources were tested for suitability for use as riprap and concrete coarse aggregate. A coarse sand and a blending sand were tested for use as concrete fine aggregate. Crushed aggregate manufactured from each of the two cores and one of the ledge rocks was tested in combination with blends of the coarse and fine sand for freezing and thawing of concrete aggregate. Consideration of the results of the petrographic examination and tests on five sources of carbonate rock for riprap indicate that the material from Mississippi Lime Company, East St. Louis Stone Company, and the Bussen Quarries, Inc., would be expected to produce better quality riprap than the other two sources, Columbia Quarry No. 9 and the Riverview Quarry. Consideration of the results of the freezing and-thawing tests conducted according to CRD-C 144 on three sources of carbonate rock, Mississippi Lime Company, Columbia Quarry No. 9, and Riverview Quarry, for use in concrete indicate similarity. However, the test values of two of the sources, Mississippi Lime Company and Riverview Quarry, were slightly higher than those of the Columbia Quarry. When considering the results of tests on these three sources of carbonate rock for producing 3-in. maximum size aggregate for concrete, it appears that the material from Mississippi Lime Company is preferable to the other two sources, Bussen Quarries, Inc., and Riverview Quarry, because it is thicker bedded. Material from a nearby Mississippi Lime Company quarry was previously used in the Alton Lock and Dam and it is known to be a reactive carbonate rock. Reaction rims have been observed in the Alton concrete. Considerations of field behavior of the Alton concrete and laboratory testing for length change of the Alton concrete show that this is not an expansive reaction and no precautionary measures are required for its use. Evaluation of rock from the Columbia Quarry and the Riverview Quarry for potential reactivity indicated that the Columbia rock was not reactive. However, some of the ledge 3 Riverview rock is potentially reactive. Therefore, in the case of its use restrictive control measures will be required. The coarse sand (Mississippi Lime Company Sand Plant) in combination with the fine sand (St. Louis County Sand Company) would be suitable for use as concrete fine aggregate provided low-alkali cement is required because of the presence of more than 5 percent chert which is in part chalcedonic.
Rights: Approved for public release; distribution is unlimited.
Appears in Collections:Miscellaneous Paper

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