Fig. 3From: Examination of sulfate resistance of nano-alumina added ordinary Portland cement paste, focusing on the two different crystallinity of nano-aluminasCompressive strengths of hardened paste samples before Na2SO4 immersion (zero d) and after Na2SO4 exposure (28, 91, and 180 d). Error bars are the standard deviations of the measured strengths for triplicate samplesBack to article page