On the 28th day after concrete was mixed, a 6.00-in-diameter concrete cylinder failed in a compressive testing at a load of 145 000 lb.
(a) Determine the ultimate strength of the concrete, in lb/in2.
(b) Determine the allowable compressive stress with a factor of safety of 5.0 against ultimate strength.
(c) Determine the maximum permissible load that the concrete can carry using the strength design method. Use a strength reduction factor of 0.60 against ultimate strength.
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