Experimental study of the physical properties and mechanical behavior of concretes containing steel fiber, polypropylene fiber and silica fume after fire

Document Type : Research Paper

Authors

1 Assistant Professor, Faculty of Civil, Water and Environmental Engineering, Shahid Beheshti University, Tehran, Iran.

2 BSc Student, Faculty of Civil Engineering, Shahid Beheshti University, Tehran, Iran

Abstract

In this paper, physical properties and mechanical behavior of concretes containing steel fiber, polypropylene fiber and silica fume have been experimentally investigated after experiencing high temperatures. For this purpose, six different mix designs and six different target temperatures (25, 100, 250, 500, 700 and 900 °C) were selected. Samples were heated in the electric furnace based on the curve with a rate of increase of 10 oC/min to reach the target temperature and then the cooling phase of the samples is performed naturally. In the following, after returning the temperature of the samples to the room temperature, compressive and tensile strength tests were performed on all of the samples and their behavior was evaluated after experiencing different target temperatures. The results show a strong drop in compressive and tensile strength at temperatures above 700 °C. It can be noted at 900 °C all specimens lost their strength. Also, by comparing the behavior of different admixtures, concrete containing steel fibers has shown more effective performance at high temperatures and the process of reducing its strength has been better than other admixtures. Finally, thanks to the large number of experiments, different relationships are presented based on the results to determine the mechanical properties of different mix designs at different temperature levels.

Keywords

References

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