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A platform for research: civil engineering, architecture and urbanism
Development of reference-samples for ultrasonic-testing of concrete
A lot of refere samples already exist in the domain of non-destructive testing of steel, whereas for concrete-testing a consisten reference sample is up tp now missing. Concrete is a complex medium, that comprises several materials so that the construction of reproducible samples is very difficult. However, reproducible samples are esential for multitude of investigations. Now it could be realised to create a reproducible testing-sample, that has nearly the characteristics of concrete. For that purpose the aggregate of normal concrete will be substitutted by a lot of cylinders (a few hundred) of glassware with equal orientation. Thereby a reproducible distribution of scattering aggregates inside the testing-sample is possible. The 3D-arrangment of aggregates will simplify to a 2D- arrangment of cylinders. The space between the cylinders will be filled with cement. This has to be carried out under vacuum, in order to minimise and control the compaction-pores inside the cement matrix. Ultrasonic-measurrements of longitudinal and transverse-wave-velocities at several locations on the prototype should in combination with porosity measurements show the reproducibility of this testing-sample. Furthermore, these measurements are very useful for the verification of prediction models for Young's modulus of concrete. Such a reproducible testing-sample allows now an accurate coordination between real ultrasonic measurements and software modelling the seismic wave propagation in concrete. Finally it is thinkable to develop this sample for specified problems to a standard-reference-sample for ultrasonic measurements on concrete.
Development of reference-samples for ultrasonic-testing of concrete
A lot of refere samples already exist in the domain of non-destructive testing of steel, whereas for concrete-testing a consisten reference sample is up tp now missing. Concrete is a complex medium, that comprises several materials so that the construction of reproducible samples is very difficult. However, reproducible samples are esential for multitude of investigations. Now it could be realised to create a reproducible testing-sample, that has nearly the characteristics of concrete. For that purpose the aggregate of normal concrete will be substitutted by a lot of cylinders (a few hundred) of glassware with equal orientation. Thereby a reproducible distribution of scattering aggregates inside the testing-sample is possible. The 3D-arrangment of aggregates will simplify to a 2D- arrangment of cylinders. The space between the cylinders will be filled with cement. This has to be carried out under vacuum, in order to minimise and control the compaction-pores inside the cement matrix. Ultrasonic-measurrements of longitudinal and transverse-wave-velocities at several locations on the prototype should in combination with porosity measurements show the reproducibility of this testing-sample. Furthermore, these measurements are very useful for the verification of prediction models for Young's modulus of concrete. Such a reproducible testing-sample allows now an accurate coordination between real ultrasonic measurements and software modelling the seismic wave propagation in concrete. Finally it is thinkable to develop this sample for specified problems to a standard-reference-sample for ultrasonic measurements on concrete.
Development of reference-samples for ultrasonic-testing of concrete
Entwicklung von Referenzproben zur Ultraschallprüfung von Beton
Bussat, S. (author) / Glaubitt, A. (author) / Neisecke, J. (author)
2003
5 Seiten, 4 Bilder, 5 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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