Introduction to Concrete Joints:
Concrete joints are important, especially for exposed concrete surfaces. They are used to nullify the effects of concrete expansion or contraction with changes in temperature. Most masonry contractors in New York take care while building concrete joints to prevent cracks on surfaces such as sidewalks. It also gives a better finish to concrete and helps in locating imminent cracks on surfaces.
These joints come handy in extremely cold conditions. Such joints are commonly spaced at distances equal to 25-30 times the slab thickness. Masonry contractors in NY normally create a contraction joint in the concrete surface during placement of concrete. They can also be sawed into the hardened concrete surface after construction.
Expansion joints separate flat slabs from other concrete portions of the structure. They allow movement of adjoining structural members so that chances of cracking are less in case of heavy load. This also allows for thermal expansion of concrete in hot weather.
Need for Construction Joints:
It is necessary to place concrete joints at meeting points of two concrete slabs. Construction joints are placed after concrete has been poured in place, so that one can work on them while the surface is wet. Joints should be designed and made by a certified structural engineer.
When the surface of the concrete is about to crack, the weakest portion is the first to crack under pressure. Concrete joints remove the liability of concrete surface cracking, putting pressure on the joints instead.
Hence, they form an integral part of concrete construction.
Some of the most commonly used tools for making concrete joints are:
- Hand Grover/Walking Grover: Hand Grover is used for making joints in small slabs, while Walking Grover is used in larger slabs. These are used to cut joints on wet concrete surfaces.
- Control Joint Tools: These are electric cutting tools for making joints on concrete surfaces. Generally used to cut joints on hardened concrete.
- Concrete-Cutting Saw: Ideal for cutting hard concrete according to the desired depth after the concrete has dried up.
If you require professional concrete services, call Tony’s Masonry at (718) 3564437.