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dc.contributor.authorPoole, Toy S.
dc.date.accessioned2016-06-20T14:13:24Z
dc.date.available2016-06-20T14:13:24Z
dc.date.issued1993-09
dc.identifier.urihttp://hdl.handle.net/11681/11015
dc.descriptionMiscellaneous Paper
dc.descriptionAbstract: The specification governing use of coal fly ash in concrete (ASTM C 618) includes a fineness uniformity requirement. This requirement is frequently exceeded. The relationship between product variation and the probability of exceeding this requirement was developed. It was found that a product standard deviation in fineness (including testing error) of less than or equal to 2.38 percent would be required to ensure that a material would meet the uniformity requirement in 95 percent of samples. Product standard deviation is strongly dependent on sampling techniques. Many apparently good fly ashes fail to meet the C 618 level of uniformity when sampled by grab samples, but more meet the requirement when analysis is done on composite samples. An error in the calibration of sieves used in the testing of fly ash fineness and a corrective action has been published. In this work, CCRL data collected on two very coarse samples were used to evaluate the improvement in testing error associated with the change. The between-laboratory standard deviation for the existing test method were found to be 4.6 percent. It was reduced to 2.4 percent when the new procedure was applied.
dc.description.provenanceMade available in DSpace on 2016-06-20T14:13:24Z (GMT). No. of bitstreams: 1 MP-SL-93-9.pdf: 4055400 bytes, checksum: 235b7b9d940976d65b9d949586ea1a11 (MD5) Previous issue date: 1993-09en
dc.publisherStructures Laboratory (U.S.)
dc.publisherEngineer Research and Development Center (U.S.)
dc.relationhttp://acwc.sdp.sirsi.net/client/en_US/search/asset/1035970
dc.relation.ispartofseriesMiscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-93-9.
dc.rightsApproved for public release; distribution is unlimited.
dc.sourceThis Digital Resource was created from scans of the Print Resource
dc.subjectCoal fly ash
dc.subjectConcrete
dc.subjectFineness
dc.subjectConcrete additives
dc.subjectParticle size determination
dc.titleProblems with fineness testing of coal fly ash for use in concrete
dc.typeDOCUMENT


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