Abstract
This paper presents a method for determining the supplementary admixture content in fresh concrete mixtures based on their dielectric properties obtained with ground-penetrating radar (GPR). The amplitudes of the electromagnetic pulses generated by the GPR before and after traveling through the fresh concrete mixture are measured and have been correlated to the replacing proportion of portland cement (PC) with the supplementary admixture (fly ash [FA], ground-granulated blast furnace slag [GGBFS], silica fume [SF], or metakaolin [MK]) in the mixture. A linear relationship between the amplitude change of the reflected electromagnetic pulse and the supplementary admixture content in the fresh concrete mixture is observed, based on which a theoretical model is established. The effects of temperature, water-binder ratio (w/b), and high-range water-reducing admixture on the amplitude change are also investigated.
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