The maximum spacing of contraction joints in unreinforced concrete slabs for a slab thickness of 20 cm is
A)4.5 m
B)10 m
C)15 m
D)20 m

Question

Quizplus · Accepted Answer

The maximum spacing of contraction joints in unreinforced concrete slabs is generally recommended to be about 24 to 36 times the thickness of the slab. For a 20 cm thick slab, this translates to a maximum spacing of about 4.8 to 7.2 meters. The closest option provided is 4.5 m, which is a conservative and commonly accepted practice for ensuring the control of cracking due to thermal contraction and shrinkage in concrete slabs.

The Maximum Spacing of Contraction Joints in Unreinforced Concrete Slabs