Physical, chemical, mineralogical and granulometric characteristics of fly ash changes from one source to another and sometimes within the same source. These changes in fly ash properties could have a profound impact on concrete’s performance. Delayed setting, slower early age strength development could be the result of incompatibilities between the cementitious materials and the admixtures. This report documents the use of dynamic shear rheometer (DSR), isothermal calorimeter and X-ray diffraction (XRD) as quick scanning tools to predict possible materials’ incompatibilities, to assess early age behavior of HVFA mixtures and most importantly to ensure that concrete performance is not compromised. Additionally, this project aims to incorporate these tools as future QA procedures in qualifying fly ashes and other supplementary cementitious materials (SCMs) used in concrete infrastructure.
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