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Asked Dec 10, 2019
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A sidewalk is made in squares of length 1 meter on each side, with expansion gaps between segments to avoid cracking. If sidewalk concrete has a linear expansion coefficient of 15*10^-6 (1/K), how far apart do the expansion gaps need to be to ensure that the sidewalk doesn't crack? Assume a 50 K temperature variation of the sidewalk.

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Expert Answer

Step 1

Given,

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length L = lm linear expansion coefficient a = 15 × 106 1/K Temperature variation AT = 50 K

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Step 2

Now, thermal ex...

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ΔL αΔΤ ΔL ΔΤL ΔL15x10' x 50 x1 ΔL750x 10% m 7.5×10* m

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