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a) Two beam specimens with 15 cm square cross-section and 45 cm span length, made from...

a) Two beam specimens with 15 cm square cross-section and 45 cm span length, made from the same concrete, were tested under 3-point bending and 4point bending. The fracture loads were 20 kN and 25 kN, respectively. Calculate the flexural strength for both cases, in MPa.
b) Estimate the compressive strength of this concrete.

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