Joints in Cement Concrete Roads - Civil Engineering

Thursday, February 14, 2019

Joints in Cement Concrete Roads

Joints in Cement Concrete Roads

Joints are provided in cement concrete road to allow expansion, contraction and warping of the slabs due to the variation in the temperature of slabs.
Joints in Cement Concrete Roads
Increase in temperature cause expansion of the slab horizontally. Similarly, decrease of temperature cause contraction of the slab horizontally. 

The slab movements also take place, in vertical direction due to the difference in temperature between top and bottom of pavement slab. During the mid-day the top of the pavement slab has higher temperature than the bottom. This causes the top fibers of the slab to expand more than the bottom fibers and the slab curls at the edge.This phenomenon is known as warping down of the slab.  

Similarly, the slab warps up during the midnight due the higher temperature of bottom slab as compared to top. To minimize the temperature stresses in the pavement slab, expansion, contraction and warping joints are provided transversely across the full width of the pavement. 

Longitudinal joints are provided to allow differential shrinkage and swelling due to the rapid change in sub grade moisture at edge and centre
..............Read more(Causes of Rigid Pavement Failures)
(Types Of Joints In Cement Concrete Road)

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