Expansion Joint Profiles: Bridge and Construction Joints
Every building structure changes its dimensions as a result of temperature, load and ground movement. To safely accommodate these movements, expansion joint profiles are used. These rubber profiles cover movement joints in bridges, buildings and industrial floors, protecting both the structure and the waterproofing. As NUR KAUÇUK MMC, we manufacture expansion joint profiles for various gap sizes.
What is an expansion joint
An expansion joint is a gap intentionally left between two parts of a structure. This gap allows the material to thermally expand and contract. However, an open gap lets water, dust and dirt in — this is precisely where the elastic profile and seal come into play.
Why it is important
If the movement joint is not covered correctly:
- Water seeps in, causing corrosion of the reinforcement.
- The edges of the concrete crack under load.
- Thermal stress creates deformation in the structure.
Application areas
- Bridges — under daily temperature differences and traffic loads, the bridge deck moves constantly; the expansion joint profile absorbs this movement.
- Multi-story buildings — for thermal expansion compensation in long facades and floors.
- Industrial floors and parking lots — to protect joints under heavy loads.
- Tunnels and water structures — to ensure waterproofing.
Thermal expansion compensation
Materials expand when heated and contract when cooled. For example, concrete that elongates in summer at +40 °C contracts in winter at -10 °C. The elastic expansion joint profile absorbs this cyclical movement in a repeatedly reproducible manner and, thanks to shape memory, returns to its previous position. For this reason, durable and highly elastic EPDM is often chosen as the material — you can read about its properties in our article what is EPDM rubber.
Profile selection and installation
When choosing the right profile, it is necessary to take into account the maximum movement amplitude, the gap width, the load type and the environmental conditions. The profile must be reliably fixed in the channel and continued without cutting at corner transitions. The profile is prepared to precise dimensions by the extrusion method — there is information about this process in our article rubber extrusion process. For waterproofing requirements, waterproof sealing systems are useful.
To choose an expansion joint profile suitable for the movement joints of your project, review our products and contact us for technical support.