3 Types of concrete joints

Dwindle to prevent concrete structures from damage caused by plastic, thermal shrinkage, movement... requires concrete joints. There are 3 common types of concrete joints as outlined bellow.

1. Contraction (control) joints

Contraction joints are intentionally installed joints, which designed to regulate cracks that might arise often unpredictable, otherwise due to the inevitable contraction of concrete. These joints are called joints often control, because you are intended to control crack sites. The required level of weakness can be made by reducing concrete cross section of tooling or saw to cut a common 24 hours. Contraction joint movement should be small.

2. Construction joints

Construction joints made before and after interruptions in placement of concrete or by placement of readily available units. Sites are generally intended to limit the work that can be done at the same time to a comfortable size with least impact of the finished structure, although you must be performed by unforeseen interruption concreting operations. According to the construction you need may be later than expansion or contraction may require sound joints or you at first, keep coat full structural integrity work. Construction joints can run horizontally or vertically depending on required the design of the structure sequence from placement.

3. Expansion joints

Expansion joints to prevent the crushing and distortion of the adjacent concrete structural units that otherwise could occur due to the transfer of compressive forces can be developed through expansion, applied loads or differential movements resulting from the configuration of the structure or its execution. Expansion joints are manufactured by a room through the whole cross section between adjacent structural units. Expansion joint movement can be high (up to 30% of the joint width).

Silicone sealant for top joints are required for each concrete structures. Concrete joint sealant will be discussed at the next coming articles.