Construction Joints

What is a construction joint:- Construction joint is the gap provided in construction for the move at the time of expansion and contraction. All construction materials expand and contract with thermal conditions. Providing vertical joints like walls should be from the base, wall its bottom beam and its footing should not be connected in any respect and should not share each other load, the gap area is filled with foam base material ( try it fill temperature is cooler ).

Joint Filler Board: Synthetic joint filler board for expansion joint shall be used only abutting structures like bridges and shall be 20 - 25 mm thick with a tolerance of +- 1.5 mm and of a firm compressible more than 25 % 

Joint Sealing compound:- The joint sealing compound shall be of the hot poured elastomeric type or cold polysulphide, polyurethane silicone type having flexibility.

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Joint:- There are five four joints recommended in the concrete pavement, and are vital for its performance. a. contraction joint b. Expansion joint c. construction joint, these are traverse joints, i.e. across the length of pavement while the longitudinal joint is along the pavement between two lanes.

Contraction joints shall consist of a mechanical sawn joint groove, 3 to 5 mm wide and one-fourth to the one-third depth of the slab +- 5mm or as stipulated in the drawing. these joints shall be widened subsequently to accommodate the sealant. Sawing of joint shall be carried out with diamond-studded blades soon after the concrete has hardened to take the load of the sawing machine and crew members without damaging the surface of the pavement, sawing operation could start as early as 8 hours after laying of concrete pavement but not later than 12 hours depending upon the ambient temperature, wind velocity relative humidity and required maturity of concrete achieved for this purpose. 

Expansion joints: The expansion joint shall consist of a joint filler board and dowel bars. The filler board shall be positioned vertically with the prefabricated joint assemblies along the line of the joint within the tolerances.

At construction joints, steel bulk leads shall be used to retain the concrete. The surface of the concrete laid subsequently shall conform to the grade and cross-sections of the previously laid pavement. when positioning of bulkhead/stop-end is not possible concreting to an additional 1 or 2 m length may be carried out to enable the movement of the joint cutting machine so that joint grooves may be cut and the extra 1 to 2 m length is cut out and removed subsequently and after the concrete has hardened. after a minimum of 14 days of curing, in case OPC cement is used and 16 days of curing when finish or blended cement is used, the construction joint shall be widened to accommodate the sealant.

Expansion joints are required in almost any structure and all construction materials expand and contract with thermal conditions. However, there is a fixed system i.e. concrete floor, which is capable of accommodating thermal expansion. It is necessary to install an expansion joint or air gap in construction to prevent cracking or separation. When it comes to construction, there are a lot of things that need to be done. When it comes to incorporating expansion joints in your construction, it is just as important as it is with everything else. It is extremely important to consider the expansion joints because too many can cause issues within your construction. The joint has a number of critical functions. It provides flexibility to the structure. It avoids a sudden break between materials, thereby preventing damage to both the materials and the building itself. Joints also act as a duct to pass water and thus prevent rain effects.

What is a construction joint?

A Joint is a space between two construction materials. For example, there is a joint between the floor and the wall, a joint between the wall and the ceiling, and a joint between the concrete pillars. All construction materials expand and contract with thermal conditions. The expansion and contraction of the construction materials cause the deformation of the construction, which will produce a crack. If the construction joints are not designed, there will be a danger of collapse at the joint. Construction joint is the gap provided in construction for the move at the time of expansion and contraction. All construction materials expand and contract with thermal conditions. Therefore, it is necessary to provide construction joints in the construction of buildings or other constructions. A construction joint is also called an expansion joint or control joint. The picture below shows a construction joint in a building.

What are the different kinds of construction joints?

Construction joint is the gap provided in construction for the move at the time of expansion and contraction. All construction materials expand and contract with thermal conditions. When the materials come in contact with each other, they may create stress that may cause the material to crack or break. The gap is provided to avoid the stress. It is also called expansion joints. They are either fixed or temporary. The construction joint is a gap provided in the construction for the move at the time of expansion and contraction. All construction materials expand and contract with thermal conditions. If there is no gap for them, the movement is inhibited and the construction cracks. If there is no gap, the construction is unstable and is likely to collapse. In general, there are three kinds of construction joints.

Conclusion: A construction joint can not only ensure the smoothness of the construction but also ensure the safety of the whole building.

Expansion joints are important for preventing a structure from damage caused by temperature changes or physical movement. Expansion joints also help prevent the cracking of structures due to thermal shock. Expansion joints are also referred to as control joints and are placed in a structure to help prevent damage from cracking and movement. A typical expansion joint consists of two pieces of plywood or a matching material. The matching material is placed in between a structure and the concrete is poured around it. Expansion joints are especially important in areas that are subject to temperature extremes or where structures experience large changes in temperature. Construction joint filler board is a type of material that helps in construction joints.