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SEM micrographs of reference and fiber-modified concrete samples demonstrating microstructure quality, ITZs, and fiber–matrix interaction: (a,b) Micrographs of M0 containing no fiber material; (c,d) Micrographs of M1 modified by addition of FA and GGBFS and containing no fiber material; (e,f) Micrographs of M8 modified by combined use of DMFM fiber and BF.
