Abstract
The effect of limewater on flexural strength and water permeability of Al 2 O 3 nanoparticles binary blended concrete has been investigated. Al 2 O 3 nanoparticles with partial replacement of cement by 0.5, 1.0, 1.5, and 2.0 wt% have been used as reinforcement. Curing of the specimens has been carried out in water and saturated limewater for 7, 28, and 90 days after casting. The results indicate that Al 2 O 3 nanoparticles up to a maximum replacement level of 2.0% produces concrete with improved flexural strength and water permeability when the specimens cured in saturated limewater with respect to the specimens cured in water. Al 2 O 3 nanoparticles can improve the filler effect and also the high pozzolanic action of fine nanoparticles increases substantially the quantity of strengthening gel. Although the limewater reduces the strength of concrete without nanoparticles, curing the specimens in saturated limewater results in more strengthening gel formation in Al 2 O 3 nanoparticles blended concrete causes high strength.
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