3. A concrete highway is built of slabs 12 m long (20o C). How wide should the expansion cracks between the slabs be (at 20o C) to prevent buckling if the range of temperature is -30o to +50o C? ( = 12 x 10-6 oC-1 for concrete)

is the minimum gap between the slabs

Explanation:

Given:

length of the concrete highway, coefficient of thermal expansion, range of temperature variation,

Now form the equation of thermal expansion:

Since each slab of the highway expands by the above length so the minimum gap between the slabs to prevent buckling:

is the minimum gap between the slabs

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