Suggest the type of joints in concrete when it is likely to increase in volume due to temperature change. Explain it and draw its neat sketch.

Suggest the type of joints in concrete when it is likely to increase in volume due to temperature change. Explain it and draw its neat sketch.
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Answer :

When it is likely to increase in volume due to temperature change expansion joint is constructed. i. Expansion joints are provided by keeping a gap between panels of concrete and later sealing it ii. The joint which is provided to present the expansion in concrete caused due to thermal stresses. iii. These stresses produce due to extreme temperature conditions. The typical expansion joint is provided with dowel bars at a depth equal to half of slab thickness. iv. This dowel of 20 mm diameter and 550 mm long is covered with metal cap filled with cotton and finally such joint is sealed using sealants like wood, thermocol or bitumen. 

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