2026 Volume 79 Issue 1 Pages 226-234
Three-dimensional pore structure characterization using FIB-SEM was conducted to elucidate the complexity of pore structures of hardened cement paste with ground granulated blast furnace slag （GGBFS）. Serial sectioning images of pores in cement paste obtained by FIB-SEM were analyzed to evaluate the three-dimensional structure. As a result, the complexity of the pore structure due to GGBFS incorporation was successfully captured both visually and quantitatively. Specifically, it was shown that increasing the GGBFS replacement ratio led to a decrease in the volume of the largest pores within the observed volume and a reduction in pore connectivity. Furthermore, at a 50％ replacement ratio, the tortuosity was found to increase compared to ordinary Portland cement paste, indicating more intricate pore pathways.
