Measuring techniques with special regard to measuring quantities and the measured object

For materials testing on concrete specimens a special-transducer for the interior of concrete and a transducer for measurement of transverse strain distribution in the specimen was developed. On instrumentation for use in PCPV's themselves, the problem of cavities in the concrete flush against the liner, necessary for transducers attached to the liner, has been solved. On measurement of concrete strength, an existing theory on the errors of transducers in concrete has been enlarged, and the hydraulic stress compensating measuring device investigated with a view to further development. The types of moisture quantities influencing the behaviour of concrete have been classified, and tests were carried out to develop a capacity measuring method. For the measurement of the total deformations a bowden wire system has been developed which is universally usable. For force measurement in the prestressing systems a magnetoelastic transformer transducer was tested. Finally, some measuring devices were tested in situ. (orig./HP)