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Q. Good surface regularity for sub-base in concrete pavement?
Surfaces of sub-base material for concrete carriageway must be built in a regular manner due to the following reasons:
(i) One of the primary functions of sub-base in concrete pavement is to provide a smooth and even interface amid concrete slab andsubgrade so that a uniform support is established. A regular surface of sub-base helps in decreasing the frictional and interlocking forces between concrete slab and sub-base and allowing shrinkage movement andeasier temperature.
(ii) A uniform sub-base surface is required in the construction of concrete slab of uniform thickness adopted in design. It saves the higher cost of concrete to make up the needed level.
Foundation Depth and Arrangement: There are two types of foundations, viz, (a) Shallow foundations, also known as open foundations, and (b) Deep foundations. Slab cul
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Interface between base plates and footings Surface of footings is generally quite rough so that some levelling has to be carried out for base plates. Interface between base pl
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1feet
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