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.

• Which structural vulnerability appeared earliest in Roman castra fortifications utilizing a vallum with timber palisade construction?
• Which effect results due to subsidence in ancient Andean agricultural terraces using 'enchedding'?
• Which limitation was encountered when early Islamic scholars attempted to refine lenses produced using grinding techniques?
• Which design challenge limited the use of Newcomen's steam engine in early 18th century mining operations?
• Which outcome occurred due to improperly compacted aggregate base beneath typical Roman roads?
• Which limitation arose when increased sizes were attempted during all-wood ship construction prior to iron reinforcement?