Multi-filament yarns testing for textile-reinforced concrete

článek ve sborníku ve WoS nebo Scopus

angličtina

The present paper copes with an experimental study of multi-filament yarns made of AR-glass which are used for textile-reinforced concrete. The behavior under tensile loading was investigated by laboratory tests. A high number of yarn specimens (over 300) of six different lengths ranging from 1 cm to 74 cm was tested to obtain statistically significant data which were subsequently corrected and statistically processed. The behavior of the yarn was predicted by the studied numerical model of the multi-filament bundle that was applied also for the later results interpretation. The model of n parallel filaments describes the behavior of a bundle with varying parameters representing different sources of disorder of the response. The aim of the carried experiment was to validate the model presumptions and to identify the model parameters to fit the real load-displacement curves. Due to a distortion of the measured displacements caused by the unstiff experiment device, only the maximal load values were statistically evaluated and the identification of the model parameters was not successful. The effect of the specimen length on its strength was demonstrated and the size effect curve did not exclude the existence of spatial correlation of material mechanical properties modifying the classical statistical Weibull theory.

filament, bundle model, size effect, Weibull theory, experiment, AR-glass yarns

KADĚROVÁ, J.; VOŘECHOVSKÝ, M.

2012

5. 6. 2012

Czech Technical University in Prague, Faculty of Transportation Sciences

Telč, Česká republika

978-80-01-05062-0

XIIIth Bilateral Czech/German Symposium

43

46

4