Abstract
Abstract Zinc oxide (ZnO) nanoparticles (nps) possess unique photocatalytic and antimicrobial properties that can be harnessed in green construction. The study is focused on the effect of partial substitution of cement with ZnO nps in silica-fume based cement composites. The strength and microstructure of binary and ternary cement composites during early and normal treatment ages have been investigated with variation in dosage of silica fume (SF), ZnO nps at a fixed water:binder ratio (0.4). The samples have been evaluated for transition in fresh properties, compressive and split tensile strength with variation in substituent dosage. In contrast to SF, ZnO nps were found to significantly retain the fresh properties of the samples. Further, the optimal usage of ZnO in the presence of SF upgraded the strength of the samples. SEM analysis established the microstructure of the samples and the crystalline nature of the cement matrix. The findings of mechanical properties were correlated with microstructure analysis. The analysis reflected the beneficiary role of ZnO nps to obtain increased strength with pore refinement relative to the standard samples.
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