Resistivity Behavior of Concrete Mixtures with Included Supplementary Cementitious Materials
Conference: Publication Date: 1 April 2019
The inclusion of supplementary cementitious materials (SCMs) in a concrete mixture will affect the results of surface resistivity tests conducted on that concrete mixture. This study was conducted in order to understand the effect that common SCM replacement ratios will have on surface resistivity results as this is an important relationship to understand if surface resistivity is to be used in the field. In this study, control mixes of set water-to cementitious material ratios were cast along with the same mixes with the inclusion of three different SCMs at selected cement replacement ratios. The SCM replacements studied included class c fly ash at 5% and 20%; blast furnace slag at 5% and 40%; and silica fume at 2% and 8%. Also studied were the effects of two common admixtures that are typically used in the industry (an air entraining agent and a high range water reducer). The surface resistivity values of the cast cylinders from each mix were taken at 1, 3, 7, 14, 21, 28, and 56 days. An ANNOVA test was performed to see the significant statistical difference between the given parameters of difference in water-to-cementitious material ratio, the percent of SCM replacement, and the inclusion of admixtures.
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