In each photo the concrete footings A were poured when the column was already in place. Later the concrete slab was poured. Explain why the 45 cracks formed in the slab at each corner of the square footing and not for the circular footing.

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Crack Detection

Concrete materials are meant for supporting structures, building foundations and they act as several load-bearing structures. Over time, due to environmental conditions, and based on the constituent materials used, concrete materials are subjected to a great degree of distress. Corrosion of the reinforcement bars due to chemical influences, uneven base, earthquake, drying shrinkages, and alkali-aggregate reactions are some of the reasons for concrete distress.