🕑 Reading time: 1 minuteJoints in concrete construction are construction, expansion, contraction and isolation joints. These joints are placed in concrete slabs and pavements at regular intervals to prevent development of cracks in concrete.
Types of Joints in Concrete ConstructionsTypes of joints in concrete constructions are:
- Construction Joints
- Expansion Joints
- Contraction Joints
- Isolation Joints
1. Construction JointsConstruction joints are placed in a concrete slab to define the extent of the individual placements, generally in conformity with a predetermined joint layout. Construction joints must be designed in order to allow displacements between both sides of the slab but, at the same time, they have to transfer flexural stresses produced in the slab by external loads. Construction joints must allow horizontal displacement right-angled to the joint surface that is normally caused by thermal and shrinkage movement. At the same time they must not allow vertical or rotational displacements. Fig.1 summarizes which displacement must be allowed or not allowed by a construction joint.
Fig.2: Types of Construction Joints in Concrete Structures