That magnitude of such expansion about contraction depends upon the type of material used in construction and the range of variation in some temperature including moisture content.
Components of a structure are not allowed free movements, therefore, internal stresses will be set up which may result in the formation of cracks.
To control either isolate thermal including other movements to avoid danger over a structure.
Ordinary roof slabs of R.C.C. 20 to 30 m intervals and at protected by layers of mud changes in direction as in phuska or other insulating media in L, T, H &U shaped struct. un-framed construction.
The unprotected slabs. =15 m
Frames:- At 30 m intervals and at corners of L, T, H, and U shaped structures.
In case of columns, the construction joint should be formedhorizontally by stopping the concrete in a column about 75 mmbelow its junction with the lowest soffit of the beam
The operation of concreting over the construction joint should beexerted up after a break of at least 4 hours
For walls Joints
The horizontal construction joint in walls should be located at the top of the plinth, top or bottom of the window opening or at any other convenient height.
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