Question: A structure is to be built with concrete with a minimum dimension of 1 5 0 mm , minimum space between rebars of 3 0

A structure is to be built with concrete with a minimum dimension of 150 mm, minimum space between rebars of 30 mm, and minimum cover over rebars of 40 mm. Two types of aggregate are locally available, with maximum sizes of 22 and 30 mm, respectively. If both types of aggregate have essentially the same cost, which one is more suitable for this structure (6pts)? Please show your rationale.

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