THE USE OF RESISTIVITY TESTING FOR QUALITY CONTROL OF CONCRETE MIXTURES (FHWA-OK-20-03)

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dc.contributor.sponsorOklahoma Department of Transportation. Materials and Research Division. Office of Research & Implementationen_US
dc.creatorHartell, Julie Annen_US
dc.date.accessioned2021-09-28T18:51:32Z
dc.date.available2021-09-28T18:51:32Z
dc.date.issued2020-08
dc.description.abstractThis study proposes a new quality control and compliance method for concrete mixture design using standard surface resistivity testing. This method helps in determining key mixture parameters such as fly ash content and w/cm of placed concrete. Based on the gain in resistivity over time, it was found that the slope of the surface resistivity versus time curve could be used to differentiate fly ash content. And, the resistivity value obtained at a sample age of 14 and 28 days could be used for identifying the water-to-cementitious material ratio of a concrete mixture containing no fly ash and containing up to 20% fly ash. Several other parameters such as, aggregate type and admixture addition are also evaluated for their effect on the outcome of a resistivity test. The proposed resistivity method could be used as a means for quality acceptance of mixture design during the construction stage. Three methodologies (Procedure A, B and C) for OkDOT Classes A and AA concrete mixtures are developed and trialed as part of a field study. In addition, the influence of laboratory ambient temperature and curing temperature was also investigated. It was found that if resistivity testing is performed in a standard temperature-controlled environment, resistivity variances are negligible. Finally, with all quality control material testing, an alternative test method is investigated in the event the primary lab specimen fails to meet the specification. The secondary compliance testing method targets the adequacy of concrete constructed onsite. In the end, the outcomes of the project can aid a DOT in devising a strategy for implementation of the resistivity method. The new tool enables control of placed concrete with respect to the approved mixture design.en_US
dc.description.peerreviewNoen_US
dc.description.versionFinal Report October 2014 - January 2020en_US
dc.format.extent172 pagesen_US
dc.format.extent2,589,277 bytesen_US
dc.format.mediumapplication.pdfen_US
dc.identifier.govdocFHWA-OK-20-03en_US
dc.identifier.otherOklahoma Department of Transportation State Planning and Research item number 2266en_US
dc.identifier.urihttps://hdl.handle.net/11244/330987
dc.languageen_USen_US
dc.relation.ispartofseriesNoen_US
dc.relation.requiresAdobe Acrobat Readeren_US
dc.subject.keywordsConcreteen_US
dc.subject.keywordsResistivityen_US
dc.subject.keywordsQuality Controlen_US
dc.subject.keywordsQuality Acceptanceen_US
dc.titleTHE USE OF RESISTIVITY TESTING FOR QUALITY CONTROL OF CONCRETE MIXTURES (FHWA-OK-20-03)en_US
dc.typeTechnical Reporten_US
dc.type.materialtexten_US

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