Fig. 8From: Freeze-thaw durability of repair mortars and porous limestone: compatibility issuesCracks developed within the porous limestone due to frost damage. Microscopic images (crossed polars): a fine-grained oolitic limestone (FL) with microcracks in between the grain boundaries crossing microsparitic cement and b opened microcrack at grain boundary coarse-grained oolitic limestone (CL) (arrows show microcracks)Back to article page