Abstract
Reinforced concrete structures exposed to chemical attacks require special repair mortar with specific features to work in a corrosive environment and interact effectively with the damaged substrate concrete. In this study, various geopolymer mixtures containing nano-SiO2 (0%, 1.0%, and 2.0% binder weight replacement) and polypropylene (PP) fibers (0%, 0.3%, and 0.6% volume fractions) were tested to evaluate bonding properties when exposed to 5% concentration of sulfate attack. The research analyzed diverse bond tests, such as the shear bond strength and tensile bond strength. The substrate layer chosen for the study was normal concrete, on which the geopolymer mixtures were used for repairing. These mixtures were then cured in an environment containing sodium sulfate. A comparison was made between the bond specimens cured in sulfate solutions and a reference mixture cured in a water tank. Although the mortar samples subjected to sulfate attack showed more shrinkage than samples cured in water, the normalized results revealed that sulfate solutions curing for geopolymer mixtures containing 1.0% nano-SiO2 causes a higher bond strength (both tensile and shear) as compared to the reference mixture in water curing.
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