Open cracks in concrete contain crystals nucleated on the fracture walls, together with fragments of crystals and structures that resemble ooids that cannot have been derived from the host concrete. The fact that similar ooids, occurring in both marine and freshwater modern-day environments, typically form in response to oscillatory water movements strongly suggests that these bodies have also been subject to oscillation. It is concluded that this movement was driven by vibration within the concrete and that this has been responsible for the formation of the ooids and potentially for the propagation of the cracks in which they are found.

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