| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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| Mechanical Properties and Acoustic Emission Response of PVA Fiber Reinforced Concrete Under Thermo-mechanical Coupling |
| LIU Xin1,2, YANG Dingyi1,2, LIU Lian3, LYU Jinfei1,2
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1 College of Civil Science and Engineering, Yangzhou University, Yangzhou 225127;
2 Research Institute of Green Building Materials, Yangzhou University, Yangzhou 225127;
3 Nanjing Academy of Urban Planning & Design Co., Ltd., Nanjing 210005 |
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Abstract The reference concrete and PVA fiber reinforced concrete were tested under thermo-mechanical coupling, using the MTS electro-hydraulic servo material testing system and its supporting high temperature furnace. Simultaneously, acoustic emission technique was adopted to monitor the whole test process. The influence of PVA fiber on mechanical properties and acoustic emission characteristics of concrete under the thermo-mechanical coupling were investigated. The results indicate that the compression damage of concrete is not instantaneous, and it is resulted from the closure, opening, development, collection of internal micro-cracks, and larger macro-crack formed by final connection of micro-cracks.400 ℃ is the turning point of the strength of PVA fiber reinforced concrete. The PVA fiber reinforced concrete presents higher peak strength residual ratio than reference concrete under corresponding temperature range. The incorporation of fiber can retard the strength degradation and improved the ductility of the concrete. Moreo-ver, the frequency and intensity of acoustic emission signal, and the energy cumulative count of PVA fiber reinforced concrete are all higher than that of reference concrete, which illustrate that the addition of PVA fiber can enhance the ability of concrete to resist damage at high temperature.
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Published: 18 October 2018
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2018, Vol. 32 
