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Asked Dec 24, 2019
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The concrete sections of a certain superhighway are designed to have a length of 25.0 m. The sections are poured and cured at 10.0°C. What minimum spacing should the engineer leave between the sections to eliminate buckling if the concrete is to reach a temperature of 50.0°C?

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Given Info: Length of the concrete section ( Lo) is 25.0 m. The temperature changes from T1 = 10.0°C to T2 of linear expansion ( a) for concrete is 12 x 10-6/°C 50.0°C. The co-efficient Formula to calculate the minimum spacing is, AL = aLo (T2 – T1) Substitute 12 × 10–6/°C for a, 25.0 m for Lo, 10.0°C for T and 50.0°C for T, in the above equation to get AL. AL = (12 × 10-0/°C) (25.0 m) [(50.0°C) – (10.0°C)] 1.2 x 10-2 m Conclusion: The minimum spacing between the sections is 1.2 x 10-2 m.

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