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dc.contributor.authorBadr, A.*
dc.contributor.authorAshour, Ashraf F.*
dc.date.accessioned2016-01-13T15:58:44Z
dc.date.available2016-01-13T15:58:44Z
dc.date.issued2005-01
dc.identifier.citationBadr, A. and Ashour, A. F. (2005) Modified ACI Drop-Weight Impact Test for Concrete. ACI Materials Journal, Vol. 102, No. 4, pp. 249-255.en_US
dc.identifier.urihttp://hdl.handle.net/10454/7669
dc.descriptionyesen_US
dc.description.abstractACI Committee 544’s repeated drop-weight impact test for concrete is often criticized for large variations within the results. This paper identifies the sources of these large variations and accordingly suggests modifications to the ACI test. The proposed modifications were evaluated and compared to the current ACI test by conducting impact resistance tests on 40 specimens from two batches of polypropylene fiber-reinforced concrete (PPFRC). The results obtained from both methods were statistically analyzed and compared. The variations in the results were investigated within the same batch and between different batches of concrete. The impact resistance of PPFRC specimens tested with the current ACI test exhibited large coefficients of variation (COV) of 58.6% and 50.2% for the first-crack and the ultimate impact resistance, respectively. The corresponding COV for PPFRC specimens tested according to the modified technique were 39.4% and 35.2%, indicating that the reliability of the results was significantly improved. It has been shown that, using the current ACI test, the minimum number of replications needed per each concrete mixture to obtain an error below 10% was 41 compared to 20 specimens for the modified test. Although such a large number of specimens is not good enough for practical and economical reasons, the reduction presents a good step on the development of a standard impact test.en_US
dc.language.isoenen_US
dc.relation.isreferencedbyhttps://www.concrete.org/publications/internationalconcreteabstractsportal.aspx?m=details&ID=14618en_US
dc.rights© 2005 ACI. Reproduced in accordance with the publisher's self-archiving policy.en_US
dc.subjectCoefficient of variation; Fiber-reinforced concrete; Drop-weight impact testen_US
dc.titleModified ACI Drop-Weight Impact Test for Concrete.en_US
dc.status.refereedyesen_US
dc.typeArticleen_US
dc.type.versionAccepted Manuscripten_US
refterms.dateFOA2018-07-25T14:48:21Z


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