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
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
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.
1 Yuan Chengfang, Zhao Jun. Damage mechanism of polypropylene fiber reinforced concrete exposed to high temperature[J]. Journal of Materials Science & Engineering,2017,35(1):37(in Chinese). 元成方,赵军.聚丙烯纤维混凝土的高温损伤机理[J].材料科学与工程学报,2017,35(1):37. 2 Yang Juan, Peng Gaifei. Effect of fiber on residual strength and explosive spalling behavior of ultra-high-performance concrete exposed to high temperature[J]. Acta Materiae Compositae Sinica,2016,33(12):2931(in Chinese). 杨娟,朋改非.纤维对超高性能混凝土残余强度及高温爆裂性能的影响[J].复合材料学报,2016,33(12):2931. 3 Hong Yaqiang. Research on the properties of modified glass fiber and polypropylene fiber reinforced concrete after high temperature[D]. Yangzhou: Yangzhou University,2015(in Chinese). 洪亚强.高温后改性玻璃纤维及聚丙烯纤维混凝土性能硏究[D].扬州:扬州大学,2015. 4 Li Mingxing. Experimental study on the mechanical and durability properties of fiber reinforced concrete after high temperature[D]. Zhengzhou: Zhengzhou University,2014(in Chinese). 李明星.纤维混凝土高温作用后的力学和耐久性能研究[D].郑州:郑州大学,2014. 5 Xiao Jianzhuang, Falkner H. On residual strength of high-perfor-mance concrete with and without polypropylene fibres at elevated temperatures[J]. Fire Safety Journal,2006,41(2):115. 6 Lau A, Anson M. Effect of high temperatures on high performance steel fibre reinforced concrete[J]. Cement and Concrete Research,2006,36(9):1698. 7 Peng Gaifei, Yang WenWu, Zhao Jie, et al. Explosive spalling and residual mechanical properties of fiber-toughened high-performance concrete subjected to high temperatures[J]. Cement and Concrete Research,2006,36(4):723. 8 Poon C S, Shui Z H,Lam L. Compressive behavior of fiber reinforced high-performance concrete subjected to elevated temperatures[J]. Cement and Concrete Research,2004,34(12):2215. 9 Harun Tanyildizi. Statistical analysis for mechanical properties of polypropylene fiber reinforced lightweight concrete containing silica fume exposed to high temperature[J]. Materials & Design,2009,30(8):3252. 10 Wu Gang, Zhai Songtao, Sun Hong, et al. Experimental study of acoustic emission of salt rock under high temperature[J]. Chinese Journal of Rock Mechanics and Engineering,2014,33(6):1203(in Chinese). 吴刚,翟松韬,孙红,等.高温下盐岩的声发射特性试验研究[J].岩石力学与工程学报,2014,33(6):1203. 11 Zhai Songtao, Wu Gang, Zhang Yuan, et al. Research on acoustic emission characteristics of granite under high temperature[J]. Chinese Journal of Rock Mechanics and Engineering,2013,32(1):126(in Chinese). 翟松韬,吴刚,张渊,等.高温作用下花岗岩的声发射特征研究[J].岩石力学与工程学报,2013,32(1):126. 12 Han Jiande, Liu Jinlong, Wang Shuguang, et al. Recent situation in research on technique of acoustic emission for concrete material and its durability[J]. Materials Review A: Review Papers,2014,28(12):110(in Chinese). 韩建德,刘金龙,王曙光,等.声发射技术在混凝土材料及其耐久性中的应用研究进展[J].材料导报:综述篇,2014,28(12):110. 13 Shi Yue, Dong Lihong, Wang Haidou, et al. Research progress of acoustic emission technology in the domain of fatigue failure[J]. Materials Review A: Review Papers,2016,30(2):109(in Chinese). 史悦,董丽虹,王海斗,等.声发射技术在疲劳失效领域的研究进展[J].材料导报:综述篇,2016,30(2):109. 14 Lin Li, Li Guolu, Wang Haidou, et al. Status of monitoring failure of fatigue wear based on acoustic emission technique[J]. Materials Review A: Review Papers,2015,29(2):109(in Chinese). 林丽,李国禄,王海斗,等.基于声发射技术监测疲劳磨损失效的研究进展[J].材料导报:综述篇,2015,29(2):109. 15 Xiao Xingliang, Wang Zhigang, Liu Changming. Refractory damage clustering research based on the acoustic emission signal parameters analysis[J]. Materials Review B: Research Papers,2013,27(9):153(in Chinese). 肖兴亮,王志刚,刘昌明.基于声发射信号参数分析的耐火材料损伤聚类研究[J].材料导报:研究篇,2013,27(9):153. 16 Xu Xiaoli. Research on the mechanical characteristics and micromechanism of granite under temperature loads[D]. Xuzhou: China University of Mining and Technology,2008(in Chinese). 徐小丽.温度载荷作用下花岗岩力学性质演化及其微观机制研究[D].徐州:中国矿业大学,2008. 17 Zhai Songtao. Experimental study on macro and microscopic characteristics of rocks under high temperature[D]. Shanghai: Shanghai Jiao Tong University,2013(in Chinese). 翟松韬.高温下岩石的宏细观特性试验研究[D].上海:上海交通大学,2013.
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2018, Vol. 32 
