Use of Electrical Test Method on Determination Aging Factor of Concrete Incorporating Supplementary Cementitious Materials Hossein Mosavi, Raid Alrashidi, Mohammed Almarshoud, Mohammed H. Alyami, Kyle A. Riding, Christopher C. Ferraro, Michael D. A. Thomas and Harvey DeFord Abstract One of the biggest benefits of using supplementary cementitious materi- als (SCMs) in concrete is the large reduction in the concrete chloride ion diffusion coefficient with age. The formation factor calculated from electrical resistivity mea- surements is proportional to the concrete effective chloride diffusion coefficient. Tra- ditionally, the aging factor used in service life modeling has been determined from examination of the apparent diffusion coefficient calculated from concrete bulk diffu- sion experiments, lumping chloride binding and with diffusion. This study proposes to use the formation factor determined from electrical resistivity tests to quantify the concrete aging parameter for service life modeling. To determine the effect of cement chemical composition, four types of cement were tested including type I/II low alkali cement, type IL cement, type V cement and type I/II high alkali cement. Silica fume, slag cement, Class F fly ash, and metakaolin were used as supplementary cementitious materials (SCMs) in binary and ternary blends with different replace- ment ratios to evaluate the effect of SCMs on the concrete electrical properties with age. The electrical properties were determined at 28, 56, 91, 182 and 365 days. A discussion about the advantages and disadvantages of this method over traditional methods to quantify aging are presented. Keywords Chloride diffusion · Chloride migration · Aging factor · Service life modeling H. Mosavi · R. Alrashidi · M. Almarshoud · M. H. Alyami · K. A. Riding (B ) · C. C. Ferraro University of Florida, Gainesville, FL, USA e-mail: kyle.riding@essie.ufl.edu H. Mosavi e-mail: smosavi@ufl.edu M. D. A. Thomas University of New Brunswick, Fredericton, NB, Canada H. DeFord Florida Department of Transportation, Gainesville, FL, USA © RILEM 2020 J. F. Martirena-Hernandez et al. (eds.), Proceedings of the International Conference of Sustainable Production and Use of Cement and Concrete, RILEM Bookseries 22, https://doi.org/10.1007/978-3-030-22034-1_34 299