Long-Lasting Concrete Safety Barriers thanks to Precise Joints
Concrete is a versatile, high-quality and long-lasting material. Natural source materials such as water and rock are combined to an eco-friendly material which exploits its strengths, especially in the field of concrete barriers.
The Contraction Joint: The calculated, linear Crack
As hydraulically hardened material, concrete shrinks during the setting and hardening process due to, among other things, changes in temperature. To avoid uncontrolled cracks, concrete barriers have to be provided with contraction joints at equal distance. The contraction joint is the calculated, linear crack. Reinforced concrete only functions properly if cracked, because only then the advantages of the two components can fully develop: The reinforcement takes over the large part of the tension while the concrete takes up the compression forces and protects the steel from corrosion. It is therefore important to control the cracking by targeted measures, so that no harmful substances can reach the reinforcement.
Wild Cracks: A substantial Safety and Cost risk
If the concrete is not cut, wild cracks will appear as uncontrollable joints. This can lead to damage of the reinforcement (even with a sufficient concrete cover) if the crack exceeds the width of 0,3 – 0,4mm. The consequences are corrosion of the reinforcement, spallings on the barrier and shorter service life. It is particularly critical if de-icing salt comes in contact with cracks, because this would speed up the corrosion process significantly. Uncontrolled cracks are a major security risk and require a time-consuming and cost-intensive rebuilding of the safety barrier.
By now, the patented, CE-Certified Faber CCC-machine has established itself as a beneficial technology, because it is able to cut precise joints into concrete safety barriers.