Which outcome occurred when Roman siege engines launched projectiles at city walls built using opus caementicium (Roman concrete)?

💡 Explanation

When siege engines impacted Roman concrete walls, localized crushing occurred because the material, while strong in compression, had relatively low tensile strength, causing highly concentrated stresses at the point of impact. Therefore localized crushing resulted, rather than yielding, fracture, or uniform stress, which contradict the properties of the concrete and the mechanics of impact.

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