Permeability measurement on high strength concrete without and with polypropylene fibers at elevated temperatures using a new test setup |
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| Affiliation: | 1. Institute of Construction Materials, University of Stuttgart, Pfaffenwaldring 4, 70569 Stuttgart, Germany;2. Materials Testing Institute (MPA) University of Stuttgart, Pfaffenwaldring 32, 70569 Stuttgart, Germany;1. School of Civil Engineering, Beijing Jiaotong University, Beijing 100044, PR China;2. School of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310014, PR China;3. Faculty of Civil Engineering and Geosciences, Delft University of Technology, 2628 CN Delft, The Netherlands |
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| Abstract: | A new test setup for permeability measurement at room and high temperature is presented. The experimental results obtained by employing the new setup are reported and validated. The experiments are performed on high performance concrete, without and with addition of polypropylene fibers under temperatures ranging from 20 °C to 300 °C as well as after cooling of previously heated specimens to the room temperature. The results show that plain concrete exhibits steady increase in permeability with increasing temperature, whereas concrete with fibers exhibit a sudden increase of permeability at temperatures between 80 °C and 130 °C. The results confirm the governing role of permeability on explosive spalling and suggest the existence of mechanisms of pressure relief other than just melting of fibers. The microstructure of concrete with fibers is investigated using SEM before and after exposure to high temperature. It is observed that the melted polypropylene flows only into the micro-cracks and does not penetrate into cement paste. |
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