I was wondering if it makes the cement weaker, but it looks like the bacteria actually make it stronger.

> At 3 days, EAM-containing samples exhibit increased overall porosity compared to the control, indicating an initial disruption in matrix densification. However, by 28 days, this effect diminishes, suggesting that hydration and subsequent microstructural stabilization mitigate the early porosity increase. Further analysis of pore size distribution (Figure 2F) shows that EAM incorporation leads to an increase in middle and large capillary mesopores, whereas coarse mesopores decrease, indicating a shift in the microstructure toward a more refined network. Despite these microstructural modifications, compressive strength measurements (Figure 2G) show that EAM incorporation does not compromise the structural integrity of cement. At 3 days, samples with higher EAM content exhibit a reduction in strength. However, by 28 days, strength recovery is observed, and EAM-containing samples exhibit a slight improvement compared to the control. This enhancement may be attributed to the formation of additional calcium carbonate, which contributes to matrix densification and mechanical reinforcement.