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In this study, the effect of limewater on the flexural strength and water permeability of concrete containing Fe 2 O 3  nanoparticles has been investigated. Portland cement was partially replaced by Fe 2 O 3  nanoparticles as nano-fillers with 0.5, 1.0, 1.5 and 2.0 wt.%. Curing of the specimens was carried out in water and saturated limewater for 7, 28 and 90 days. The results indicate that replacement of cement by Fe 2 O 3  nanoparticles up to 2.0 wt.% produces concrete with improved flexural strength and water permeability when the specimens are cured in saturated limewater. The level of replacement for the specimens cured in water is 1.0 wt.%. Fe 2 O 3  nanoparticles can improve the filler effect and the high reactivity of fine particles also substantially increases the quantity of strengthening gel.

The effects of curing medium on the flexural strength and water permeability of cementitious composites containing Fe 2 O 3 nanofillers