What are control joints in concrete?
Keeping this in view, what is the purpose of a control joint in concrete?
Control joints are typically used in concrete masonry to reduce the occurrence of shrinkage-related cracking. A control joint is a continuous vertical joint filled with mortar, but with a bond breaker on one side so that tensile stress cannot develop across the joint.
Similarly, where do control joints go in concrete? Control joints are generally placed into the concrete during the finishing process or within 24 hours of being poured.
Control joints are commonly found in concrete:
- Garage floors.
- Basement floors.
- House slabs.
Accordingly, what is the difference between a control joint and an expansion joint?
A control joint is used to reduce the occurrence of shrinkage in concrete, and it is usually a continuous, vertical joint filled with mortar. An expansion joint is a continuous or horizontal joint.
How many control joints are there in concrete?
Space joints (in feet) no more than 2-3 times the slab thickness (in inches). A 4" slab should have joints 8-12 feet apart. Cut joints deep enough. Cut joints 25% of the depth of the slab.