- fr
- en
Aurélien Mazzoni
Abstract
Thermomechanical behavior of a refractory concrete: mineral fibers reinforcement effects
Aurélien Mazzoni - 8 December 2009
Addition of fibres in concrete can modify in important manner its mechanical behaviour. The generated modifications depend essentially on the geometry and the composition of introducing fibres (metal, glasses, ceramics, etc.), on their voluminal fraction, on the requested temperature and on the thermical behaviour of the reinforced material. The concrete is a damageable material with a brittle or quasi-brittle behaviour whose properties in direct tension are weakest. The fibres reinforcement has for mainly objective to improve this behaviour under traction. The fibres can delay the apparition of the phenomenon of the damage localization,increase the capacity of material deformation, allow a resumption of load after cracking and increase the stress level to the peak. These generic characteristics are also representative of the case of the refractory concretes. However, for the latter, the temperature also exploits an important part on their mechanical behaviours and their evolutions. The aim of this study lies in the comprehension of the thermomechanical behaviour and of the microstructural refractory concrete evolutions reinforced by mineral or ceramic fibres. Thus, the fibres reinforced refractory concretes are tested mechanically to study the evolution of their mechanical behaviour in a broad range of temperatures. The principal methods of microstructural characterization are scanning electron microscopy. The results complementarity of the mechanical tests and the microstructural observations makes it possible to interpret the behaviours of the reinforced refractory concretes, in particular in terms of reinforcement mechanisms.
Key words:
refractory concrete, minerals fibres, ceramic, glass,
thermomechanical behaviour, microstructure.
Plan du site