Which of the following type of stresses is produced due to temperature variation in concrete pavement?

I. Warping stresses

II. Frictional stresses 

Explanation:

Stresses Due to Temperature Variation in Concrete Pavement: Temperature variations can cause different types of stresses in concrete pavements due to expansion and contraction. The main types of stresses produced are:

• Warping Stresses (I): These stresses are induced due to the temperature differential between the top and bottom surfaces of the concrete slab. During the day, the top surface heats up and expands more than the bottom, causing the slab to warp upwards. At night, the opposite occurs, causing the slab to warp downwards.
• Frictional Stresses (II): These stresses are generated due to the friction between the concrete slab and the underlying base or subgrade. As the slab expands or contracts with temperature changes, frictional resistance at the interface can cause tensile or compressive stresses within the slab.

Therefore, both statements I and II are correct.