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The width of the expansion joint is 20 mm in a cement concrete pavement. The laying temperature is 20°C and the maximum slab temperature in summer is 60°C. The coefficient of thermal expansion of concrete is 10 × 10–6 mm/mm/°C and the joint filler compresses up to 50% of the thickness. The spacing between expansion joints should be
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- 20 m
- 25 m
- 30 m
- 40 m
Correct Option: B
Max. expansion = αt. L
= 10 × 10–6 × (60 – 20) × L
δ1 = 400 × 10–6 × L
| δ1 = | = 10 mm(50% compression) 10 mm = 400 × 10–6 × L | |
| 2 |
| L = | = 25 m | |
| 400 × 10–6 |
