Thursday, December 1, 2016

What is the function of a separation membrane between concrete pavement slab and sub-base?

What is the function of a separation membrane between concrete pavement slab and sub-base?

The separation membrane between concrete pavement slab and sub-base has the following functions:

(i) It aids in reducing the frictional forces between concrete slab and sub-base and helps to movement of concrete slab with respect to sub-base owing to changes in temperature and moisture.
(ii) It prevents the loss of cement and water in immature concrete which significantly affects the strength and durability of hardened concrete.
(iii)It avoids the mixing up of sub-base materials and freshly placed concrete.

Polythene sheeting, which is a waterproof material, is commonly used as separation membrane.  

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