Spannbett-Vorspannung dünner Carbonbeton-Platten

Pre-tensioning of thin-walled carbon-concrete slabs

The present article describes investigations on the suitability of sanded CFRP-slats as tendons for thin-walled carbon-concrete slabs. Since the pre-stressing force is introduced into the member only by bond between tendon and concrete, pull-out and pre-stress introduction tests are performed in the context of this work. Based on the results of these tests the bond-slip diagram is determined and the pre-stress introduction length is estimated. Furthermore, the structural behaviour of pre-stressed carbon-concrete slabs is investigated by means of bending tests, and the influences of reinforcement's bond characteristics are discussed. From the obtained test results a model is derived describing the bending behaviour. Finally, dimensioning recommendations for pre-stressed carbon-concrete slabs are proposed.