Rigid cylindrical bar, generally made of wood, plastic, or steel. Known as an expansion bolt in its original manufacturing form.
Steel dowel, commonly used to fix (fasten) any object by being placed into a drilled area on a rock or wall.
Corrosion resistant booster steel bars which allow for the balancing of biaxial load transfer, while fixing the concrete in blocks.
WHY CHOOSE THEM?
- The loads of the vehicles crossing over concrete blocks are transferred to other concrete blocks so that potential corrosion to the concrete is avoided.
- In places where they are used they extend deformation life and provide long life structures.
- They prevent the load from affecting a single point by ensuring that concrete is flexible.
Potential deformations in the concrete such as cleavage, distortion, collapse are minimized.
WHY ARE THEY COATED IN EPOXY PAINT?
The potential corrosion of dowel bars is prevented by epoxy coating. The main factor in corrosion is surface and internal liquid contact with the concrete due to naturally occurring precipitation, sea water or thawing ice. When liquid progress reaches steel bars, it causes bars to corrode and expand, so that cracks and fractures occur on concrete surfaces. Epoxy coating is applied to eliminate this and increase resistance to corrosion.
PLACES OF USE
These are preferred in the construction of airport runways, aprons, concrete roads and areas with high strength in particular and structures with long life and high deformation resistance.
STANDARDS, MANUFACTURING TECHNIQUES AND MANUFACTURING RANGES
- Dowel bar manufacturing methods are specified by ASTM standards.
- The manufacturing diameter is between 25-38mm according to the standards. However, this can change according to customer request.
- Nevertheless, we manufacture to standard diameters between 19-80mm.
- The standard dowel bar length is 500mm. However, they can be manufactured in various lengths upon request or in uncut lengths of 6000mm.
- They are manufactured as per the values of requested yielding-pulling-shear standards and tested and approved by our quality unit.
- They are manufactured from ASTM A615/A 615M, ASTM A675/A 675M, ASTM A706/A 706M and ASTM A1035/A 1035M steel billets.
- Flat surface and smooth cut end types can be coated by epoxy paint optionally in accordance with the ASTM A775/A775M standard.
- Our products’ manufacturing phase is inspected and supervised by a quality control system and all control reports are delivered to the customer along with the product.
- Once the manufacturing process is complete, dowel bars are generally packed in specially produced wooden cases on EUR-pallets and dispatched with PVC covers ready for international ship, trailer and container transportation.
- They are encased in PE matte tubes in accordance with the ASTM A775/A775M standard. Thus, dowel bars are dispatched in compliance with European standards and always without any damage. Packing can be performed to request, depending on the project.
INTENDED USE OF DOWEL BARS
Reinforcement between concrete blocks is achieved via the high connection performance of dowel bars. Therefore, regardless of the load on the concrete road, its weight will be distributed equally over the entire concrete, eliminating issues such as collapsing and damaged concrete. This avoids both huge financial losses and potential loss of lives.
In the picture we see that the overload is applied, but the load is evenly distributed, so that the concrete does not stretch, causing cracks, collapses or any damage.
WHAT IS THE LIFE CYCLE COST OF DOWEL BARS COATING WITH EPOXY PAINT?
As a result of the researches, system-life cycle costs of dowel bars are coated with epoxy paint and uncoated. The long-term advantage of epoxy coating is shown in the tables and graphics.
As dowel bars are used in strategic places (such as airports, motorways, viaducts), uncoated installation in these places are observed to provide an initial concrete repair time of 14 years due to corrosion. It is observed that epoxy coating extends the service life of normal concrete three-fold. Thus, it provides a huge advantage to focus on life-cycle cost before starting projects.
DOWEL BARS ARE INSTALLED USING 3 DIFFERENT METHODS:
1- The trestling method can also be used. This is done by placing concrete over dowel bars placed with diameters specified at standard and certain intervals.
2- Dowel bars are placed into specially manufactured machines and simultaneously placed and positioned together with the concrete.
3- Deformed areas requiring treatment are drilled appropriately, dowel bars are placed and concrete is placed again so that the ground is reinforced.