Table of Contents
Types of joint
There are four types of joint in concrete construction as follows. These joins are provided in concrete structures to avoid forming cracks.
- Construction Joints
- Expansion Joints
- Contraction Joints
- Isolation Joints
Let us discuss each type of joint in concrete construction.
1. Construction Joints
Construction joints are provided to permit both ways displacement in the slab. It is also transferred flexural stresses in the concrete slab.
2. Expansion Joints
Concrete has a tendency to expand and volume changes due to various factors like thermal expansion. To avoid this problem, expansion joints are needed in the concrete structures. Slabs longer than 45 meters require one or more expansion joints.
3. Contraction Joints
It is a sawed, formed, or tooled groove in a concrete slab that forms a weakened vertical plane. It controls the location of the cracking due to dimensional changes in the concrete slab. It is also known as a control joint.
4. Isolation Joints
This type of joint is a separation between adjacent sections of a concrete structure to permit relative movement in 3 directions and through which all of the bonded reinforcement is interrupted.
