Non-destructive test procedures

Non-destructive test procedures enable quick and reliable assessments of the critical condition of a structure without affecting the continued use of the structure as there is no need to cause additional damage by taking samples.

The non-destructive test procedures we offer include:

  • Measuring the concrete cover/location of reinforcement using inductive measuring techniques
  • Determining component geometry/locating defects using magnetic fields/ultrasound
  • Determining the compressive strength of concrete using a concrete test hammer (Schmidt hammer)
  • Temperature and humidity measurement
  • Inspection of hard-to-access components using an endoscope/borescope
  • Measurement of the potential field using rod electrodes, one-wheel and four-wheel electrodes
  • Measuring the specific electrical resistance of concrete (Wenner probe, Resipod 50 mm Geometric)


Concrete cover/location of reinforcement

It is possible to locate the reinforcing elements of reinforced concrete components non-destructively using an inductive measuring technique. Knowing the location of reinforcement means, for example, that cores can then be taken to determine the compressive strength of the concrete without damaging the reinforcement. In addition, this technique can be used to determine the diameter of the reinforcing bars, making it possible to estimate the load that can be borne by the component.

Available equipment (selection):

  • Hilti FS 10 Ferroscan
  • Hilti PS 200 Ferroscan

The Ferroscan systems PS 200 and FS 10 are used to locate reinforcements and determine their depth and diameter. The systems are able to detect reinforcing iron up to a depth of 160 mm (PS 200) or 180 mm (FS 10). Both systems can determine the diameter of the reinforcement up to a depth of 60 mm. To take the measurement, the scanner is passed directly over the surface of the component. The data collected are stored in the scanner and then transferred to the monitor. The monitor can store and display large quantities of data. It provides a visual representation of the position of the reinforcement.

Component geometry/location of defects

Using ultrasound measurement it is possible to determine the thickness and geometry of a component even when it can only be accessed from one side. It is also possible to locate defects in components, such as voids, grouting errors in jacket tubes in the case of prestressed concrete components, and compaction flaws in concrete components.

Available equipment (selection):

  • Proceq TICO ultrasonic testing instrument
  • ACS A1220 Monolith low-frequency ultrasonic flaw detector

The low-frequency ultrasonic flaw detector A1220 Monolith, used with the ACS M2502 24-head array, is designed primarily for non-destructive analysis of the structural condition of concrete, steel and prestressed concrete structures. It offers many benefits, such as ease of operation and taking measurements without the need for contact media, enabling quick and efficient work especially on rough surfaces. The detector can perform both reflective and transmission measurements, making it useful for a range of applications in component analyses.

The measured data are stored in the device and can be displayed visually using device-specific software.

Compressive strength of concrete

Compressive strength is one of the key characteristics of concrete as it has a direct influence on the load-bearing capacity of concrete constructions. The compressive strength and compressive strength development can be determined quickly, directly and non-destructively at the component using a concrete test hammer or Schmidt hammer. Alongside non-destructive determination of compressive strength, this measuring technique can also identify weak spots in the concrete component and check for uniformity of concrete quality over a large area.

 Available equipment (selection):

  • Proceq N-34 concrete test hammer

The striking face of the concrete test hammer hits the surface of the concrete with a defined energy. The body of the hammer rebounds with a greater or lesser force depending on the hardness of the concrete. This rebound is measured by the device and provides information on the hardness of the concrete. The conversion curve can be used to determine the compressive strength based on the measured values. The Schmidt hammer can be used for compressive strengths between 10 and 70 N/mm².


T +49 (0)341 6582-145