What is the necessity of providing joints in concrete?

In the first instance, such joints provide a way in which concrete can shrink due to loss of water (ie drying) without cracking in an ugly manner. read more

Joints are used in concrete slab design to prevent cracking caused by expansion and contraction of concrete. They are specifically important in structures exposed to the weather such as a parking garage. read more

Maximum Joint Spacing should be 24 to 36 times the thickness of the slab. Joints should be spaced about 10 feet and a maximum of 15 feet. When using joint groove for contraction joints, the joint should be a minimum depth of ¼ thickness of the slab. Saw-cut joints should be done within 4 to 12 hours after the concrete has been finished. read more

Expansion joints in Concrete. The concrete is subjected to volume change due to many reasons. So we have to cater for this by way of joint to relieve the stress. Expansion is a function of length. The building longer than 45m are generally provided with one or more expansion joint. In india recommended c/c spacing is 30m. The joints are formed by providing a gap between the building parts. read more