Entwicklung und Anwendung der Ultraschalltechnik zur Qualitätssicherung von Beton: unter besonderer Berücksichtigung der Beiträge von Prof. Hans-Wolf Reinhardt

Development and application of ultrasonic techniques for the quality control of concrete. This paper is dedicated to Prof. Reinhardt for excellent supervision and exciting research. He was about 20 years my supervisor and mentor. On the occasion of the 80^th birthday of Prof. Hans-Wolf Reinhardt, one of the most important modern measuring techniques for concrete quality control is discussed. It was developed under his guidance and facilitates the ultrasound technique for monitoring and analyzing fresh concrete and mortar properties during setting and hardening. To stress Prof. Reinhardt's merits, the developments at the University of Stuttgart are summarized. They culminated in one of the first commercially available modern test device that was the blueprint for other devices. The paper is giving also an introduction into the capabilities of the technique along with some more recent example of applications and a brief overview about standardization activities. The author's hope is that more scientists and practitioners are stimulated to use and further develop this technique establishing it on a broader range in the area of building constructions.