Abstract
This study discusses the feasibility of using graphene oxide (GO) as an additive to improve the strength of cementitious composites. The compressive strength and pore structure of a cementitious composite were evaluated, where 0.025 wt% of the unit weight of cement was replaced by GO. This was previously identified as the optimal replacement ratio. Cementitious composites replaced with conventional cement additives, such as fly ash (FA), silica fume (SF), nanosilica (NS) and ground granulated blast-furnace slag (GGBS), were studied for comparison. The cementitious composites replaced with GO had slightly lower air content, but had compressive strength that was 10.6–41.5% higher than that of the plain mixture, and also higher than that obtained with other cement additives. Pore structure analysis revealed that the majority of pores were micropores having diameters not exceeding 2.5 nm; this improved the strength.
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