Anisotropic behavior of damaged concrete and fiber reinforced concrete
[ 1 ] Instytut Architektury i Planowania Przestrzennego, Wydział Architektury, Politechnika Poznańska | [ 2 ] Instytut Konstrukcji Budowlanych, Wydział Budownictwa i Inżynierii Środowiska, Politechnika Poznańska | [ P ] employee
2003
chapter in monograph / paper
english
- oriented damage
- induced anisotropy
- concrete composites
EN The aim of this paper is to study the process of the damage growth in rock-like cementitious brittle materials. In particular, the degradation of internal structure of ordinary concrete was compared with that detected in the same concrete but enriched by addition of the of steel fibers. To this end the standard cubical specimens of the concrete and fiber concrete were subjected to uni-axial compression. It was found that in the case of ordinary concrete the pronounced transverse isotropy was developed due to an oriented damage growth. However, the same concrete but reinforced by addition of the steel fibers showed practically isotropic properties until its failure. It means that certain amount of steel fibers dispersed in the volume of the concrete can change the character of the internal damage from strongly oriented in the case of ordinary concrete to rather isotropic for fiber reinforced concrete. Experiments performed also showed that for certain configuration of properties of matrix materials and amount of steel fibers no effect of reinforcement was practically detected. The damage growth for this specific case of fiber concrete was practically the same as that determined in respective ordinary concrete. The experimental results for all the materials tested were compared with the theoretical predictions obtained from the own theoretical model based on the methods of the damage mechanics. Anisotropic behaviour of high temperature resistant concrete subjected to bi-axial state of stress at elevated temperature was also studied.
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