Abstract
This paper describes the influence of the temperature and the fibre reinforcement on the flexural fatigue behaviour of an ultra-high-performance fibre-reinforced concrete. Three-point bending fatigue tests were carried out for an ultra-high-performance concrete subjected to different temperatures ranging from room temperature up to 300 ºC and considering three different types of reinforcement: a) steel fibres, b) hybrid steel and polypropylene fibres and c) non-reinforced (reference matrix). The fatigue behaviour was assessed from the S-N fields obtained through a probabilistic fatigue model developed by Castillo and Fernández-Canteli. The influence of the type of reinforcement on the fatigue behaviour was analysed by SN curves. An analysis of the thermal effects in the fatigue life of the ultra-high-performance concrete has also been carried out. The results showed the most suitable fibre reinforcement among the analysed options to get the best fatigue behaviour in accordance to the exposure temperature.
Highlights
Ultra-high-performance fibre-reinforced concrete (UHPFRC) is characterized by a significant enhancement of its mechanical properties, especially the tensile strength, in comparison to conventional or high strength concrete [1]
In this study has been shown the effect of fibre reinforcement and temperature separately to remark more clearly their influences
The addition of PP fibres in the concrete matrix might decrease the flexural monotonic strength and increase the energy absorption capacity in accordance to the fibre content [33]. In this case the monotonic flexural strength decreased from 26 MPa to 19 MPa which, in the fatigue behaviour derived into a slight reduction of the endurance limit as can be seen in Table 3 and a softer trend of the S-N curves respectively
Summary
Ultra-high-performance fibre-reinforced concrete (UHPFRC) is characterized by a significant enhancement of its mechanical properties, especially the tensile strength, in comparison to conventional or high strength concrete [1]. In this paper the flexural fatigue behaviour of an ultrahigh-performance fibre-reinforced concrete and its corresponding matrix without any reinforcement are reported in terms of its S-N curves at different temperatures (room temperature, 100 oC, 200 oC and 300 oC). It was obtained through a probabilistic analysis that the thermal damage in the cement paste strongly decrease the endurance limit and increase the scattering in the S-N curves.
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