Tension Rod Break Detection
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A large number of older prestressed concrete bridges will need to be replaced with new structures in the coming years due to stress corrosion cracking (SCC) and insufficient structural integrity. It is undisputed that extensive testing must be conducted to ensure structural stability.
These range from visual inspections to non-destructive testing using the latest techniques. Magnetic stray field measurement (also known as prestressing steel fracture detection) is a suitable non-destructive testing method.
Physical Principles
Using the non-destructive method based on magnetic stray field measurement, fractures in prestressing tendons can be localized. The type of bond between the prestressing tendons is irrelevant. Breaks in prestressing tendons can be detected in both immediate bonding (prestressing tendons are prestressed during concrete placement) and post-tensioning (prestressing of the tendons occurs after the concrete has hardened). Localization is also possible when both sides of the break are in contact.
A magnetic testing system is guided over the surface of the concrete component along the prestressing tendon to be inspected. Magnetic stray fields form at the break points of individual prestressing wires, which can be measured by sensors.
The prestressing tendons are inspected using the BetoFlux system, developed specifically for this purpose by the Fraunhofer Institute for Non-Destructive Testing (IZfP) in Saarbrücken.
Bridge inspection in accordance with DIN 1076
Bridge structures must be inspected at regular intervals in accordance with the requirements of DIN 1076 and the Federal Guidelines for the Monitoring of Structural Safety (RÜV) to detect damage at an early stage. In addition to structural durability, the stability and traffic safety of the structure must also be assessed.
Measurement of concrete cover
The cover depth of the reinforcement contained in concrete components is a key factor in ensuring the durability of structures. The requirements depend on the type and location of the component in question.
Non-destructive testing
Not every structural analysis requires interventions in the building fabric. Various non-destructive or low-destructive test methods are available, especially for an initial assessment of the existing damage potential or to confirm the correct construction.
Skid resistance measurements SKM method
The SKM process focuses not only on the quality of the road, but also on road safety. The measurement provides important values for the condition assessment and evaluation of new or existing road surfaces.
