高应变率下多尺寸聚丙烯纤维混凝土动态压缩力学性能研究
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摘要
采用Φ74mm的分离式霍普金森压杆(Split Hopkinson pressure bar,SHPB)试验装置,对两种尺寸聚丙烯细纤维和一种尺寸聚丙烯粗纤维单掺及混掺的混凝土试件进行冲击压缩试验,对比分析粗、细纤维及不同纤维掺量比的多尺寸纤维混凝土试件在五种不同应变率下的动态压缩强度、动态压缩变形、动态压缩韧性和破坏特征,研究聚丙烯纤维混凝土的动态压缩力学性能。结果表明:随应变率的增加,素混凝土及纤维混凝土的动态压缩强度、动态压缩变形和动态压缩韧性表现出显著的应变率效应;在试验应变率范围内,粗聚丙烯纤维混凝土的动态抗压强度最高,相对素混凝土增幅为132.36%~213.85%;多尺寸聚丙烯纤维混凝土的动态强度增长因子与素混凝土基本一致;掺入多尺寸聚丙烯纤维可有效增大混凝土在不同应变率下的动态峰值应变和动态极限应变;多尺寸聚丙烯纤维混凝土的动态极限韧性较高,其中细聚丙烯纤维含量为1.2kg/m~3时混凝土动态极限韧性最高,增幅为121.11%。
Impacting compression tests of fine polypropylene fibers in two sizes and thick polypropylene fibers in one size,single-doped and mix-doped with concrete were conducted by 74 mm diameter split Hopkinson pressure bar(SHPB).Multi-size polypropylene fiber concrete specimens with coarse,fine fiber and different fiber content at 5 different strain rates under dynamic compressive strength,dynamic compressive deformation,dynamic compressive toughness and failure forms were compared and analyzed.The dynamic mechanical properties of polypropylene fiber were studied.The results showed that the dynamic compressive strength,dynamic compression deformation and dynamic compression toughness of concrete and fiber concrete show a significant strain rate effect with the increase of strain rate.In the range of strain rate,the dynamic compressive strength of coarse polypropylene fiber reinforced concrete is the highest,and in comparing with that of the plain concrete increased by 132.36%—213.85%.The dynamic compressive strength growth factor of multi-scale polypropylene fiber concrete is basically the same with that of plain concrete.The dynamic peak strain and ultimate strain of concrete under different strain rates can be increased effectively by adding polypropylene fiber.The dynamic ultimate toughness of multi-scale polypropylene fiber concrete is higher than that of polypropylene fiber concrete,and the dynamic ultimate toughness is the highest when the content of fine polypropylene fiber is 1.2 kg/m~3,and the growth rate is up to 121.11%.
Impacting compression tests of fine polypropylene fibers in two sizes and thick polypropylene fibers in one size,single-doped and mix-doped with concrete were conducted by 74 mm diameter split Hopkinson pressure bar(SHPB).Multi-size polypropylene fiber concrete specimens with coarse,fine fiber and different fiber content at 5 different strain rates under dynamic compressive strength,dynamic compressive deformation,dynamic compressive toughness and failure forms were compared and analyzed.The dynamic mechanical properties of polypropylene fiber were studied.The results showed that the dynamic compressive strength,dynamic compression deformation and dynamic compression toughness of concrete and fiber concrete show a significant strain rate effect with the increase of strain rate.In the range of strain rate,the dynamic compressive strength of coarse polypropylene fiber reinforced concrete is the highest,and in comparing with that of the plain concrete increased by 132.36%—213.85%.The dynamic compressive strength growth factor of multi-scale polypropylene fiber concrete is basically the same with that of plain concrete.The dynamic peak strain and ultimate strain of concrete under different strain rates can be increased effectively by adding polypropylene fiber.The dynamic ultimate toughness of multi-scale polypropylene fiber concrete is higher than that of polypropylene fiber concrete,and the dynamic ultimate toughness is the highest when the content of fine polypropylene fiber is 1.2 kg/m~3,and the growth rate is up to 121.11%.
引文
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7 Zhang Hua,Liu Yang,Sun Hao,et al.Transient dynamic behavior of polypropylene fiber reinforced mortar under compressive impact loading[J].Construction and Building Materials,2016,111(2):30.
8 Yan Shaohua,Guo Zhikun,Chen Li.Dynamic behaviors of polypropylene fiber reinforced lightweight aggregate concrete by SHPB tests[J].Journal of PLA University of Science and Technology(Natural Science Edition),2008,9(2):156(in Chinese).严少华,郭志昆,陈立.聚丙烯纤维增强轻骨料混凝土SHPB试验[J].解放军理工大学学报(自然科学版),2008,9(2):156.
9 Li Weimin,Xu Jinyu.Mechanical properties of basalt fiber reinforced geopolymeric concrete under impact loading[J].Materials Science and Engineering A,2009,505(1-2):178.
10 Wang Pu,Huang Zhen,Zhou Dai,et al.Impact mechanical properties of concrete reinforced with hybrid carbon fibers[J].Journal of Vibration and Shock,2012,31(12):14(in Chinese).王璞,黄真,周岱,等.碳纤维混杂纤维混凝土抗冲击性能研究[J].振动与冲击,2012,31(12):14.
11 Li Zhi,Lu Zhean,Chen Meng,et al.Impact compression experiment of hybrid fiber reinforced concrete by using SHPB technique[J].Concrete,2011(4):20(in Chinese).李智,卢哲安,陈猛,等.混杂纤维混凝土冲击压缩性能SHPB试验研究[J].混凝土,2011(4):20.
12 Huang Guodong,Ma Qinyong.Experimental study and analysis of layer hybrid fiber reinforced concrete mechanical performance[J].Chinese Journal of Underground Space and Engineering,2010,6(2):329 (in Chinese).黄国栋,马芹永.混杂纤维混凝土力学性能试验研究与分析[J].地下空间与工程学报,2010,6(2):329.
13 Zhu Haitang,Gao Danying,Wang Zhanqiao.Experimental study on fracture properties of hybrid fiber Reinforced high-strength concrete[J].Journal of Building Structures,2010,31(1):41(in Chinese).朱海堂,高丹盈,王占桥.混杂纤维高强混凝土断裂性能试验研究[J].建筑结构学报,2010,31(1):41.
14 Almusallam T,Ibrahim S M,Al Salloum Y,et al.Analytical and experimental investigations on the fracture behavior of hybrid fiber reinforced concrete[J].Cement&Concrete Composites,2016,74(11):201.
15 Liang Ninghui,Liu Xinrong,Sun Ji.Experimental study of crack resistance for multi-scale polypropylene fiber reinforced concrete[J].Journal of China Coal Society,2012,37(8):1304(in Chinese).梁宁慧,刘新荣,孙霁.多尺度聚丙烯纤维混凝土抗裂性能的试验研究[J].煤炭学报,2012,37(8):1304.
16 Song Li,Hu Shisheng.Two wave and three wave method in SHPB data processing[J].Exlposion and Shock Waves,2005,25(1):368(in Chinese).宋力,胡时胜.SHPB数据处理中的二波法与三波法[J].爆炸与冲击,2005,25(1):368.
2 Ross C A,Tedesco J W,Kuennen S T.Effects of strain-rate on concrete strength[J].ACI Materials Journal,1995,92(1):37.
3 Jitsu K,Shirai K,Ito C,et al.Effects of strain rate on concrete strength subjected to impact load-dynamic compressive strength test by Split Hopkinson pressure bar method[C]∥5th International Conference on Structures Under Shock and Impact.Greece,1998.
4 Jiang Guoping,Huan Shi,Jiao Chujie,et al.Dynamic performances of polypropylene fiber reinforced concrete based on SHPB experiment[J].Journal of Sichuan University(Engineering Science Edition),2009,41(5):82(in Chinese).蒋国平,浣石,焦楚杰,等.基于SHPB试验的聚丙烯纤维增强混凝土动态力学性能研究[J].四川大学学报(工程科学版),2009,41(5):82.
5 Zhang Yuning,Fang Qin,Hou Xiaofeng,et al.SHPB test research on dynamic mechanical properties of polypropylene fiber reinforced concrete with high fiber volume[J].Concrete,2006(9):54(in Chinese).张育宁,方秦,侯晓峰,等.高掺量聚丙烯纤维混凝土动力性能的SHPB试验研究[J].混凝土,2006(9):54.
6 Hu Jinsheng,Zhou Zaosheng,Tang Degao,et al.Study of SHPB compression experiment for polypropylene fiber reinforced concrete[J].China Civil Engineering Journal,2004,37(6):12(in Chinese).胡金生,周早生,唐德高,等.聚丙烯纤维增强混凝土分离式Hopkinson压杆压缩试验研究[J].土木工程学报,2004,37(6):12.
7 Zhang Hua,Liu Yang,Sun Hao,et al.Transient dynamic behavior of polypropylene fiber reinforced mortar under compressive impact loading[J].Construction and Building Materials,2016,111(2):30.
8 Yan Shaohua,Guo Zhikun,Chen Li.Dynamic behaviors of polypropylene fiber reinforced lightweight aggregate concrete by SHPB tests[J].Journal of PLA University of Science and Technology(Natural Science Edition),2008,9(2):156(in Chinese).严少华,郭志昆,陈立.聚丙烯纤维增强轻骨料混凝土SHPB试验[J].解放军理工大学学报(自然科学版),2008,9(2):156.
9 Li Weimin,Xu Jinyu.Mechanical properties of basalt fiber reinforced geopolymeric concrete under impact loading[J].Materials Science and Engineering A,2009,505(1-2):178.
10 Wang Pu,Huang Zhen,Zhou Dai,et al.Impact mechanical properties of concrete reinforced with hybrid carbon fibers[J].Journal of Vibration and Shock,2012,31(12):14(in Chinese).王璞,黄真,周岱,等.碳纤维混杂纤维混凝土抗冲击性能研究[J].振动与冲击,2012,31(12):14.
11 Li Zhi,Lu Zhean,Chen Meng,et al.Impact compression experiment of hybrid fiber reinforced concrete by using SHPB technique[J].Concrete,2011(4):20(in Chinese).李智,卢哲安,陈猛,等.混杂纤维混凝土冲击压缩性能SHPB试验研究[J].混凝土,2011(4):20.
12 Huang Guodong,Ma Qinyong.Experimental study and analysis of layer hybrid fiber reinforced concrete mechanical performance[J].Chinese Journal of Underground Space and Engineering,2010,6(2):329 (in Chinese).黄国栋,马芹永.混杂纤维混凝土力学性能试验研究与分析[J].地下空间与工程学报,2010,6(2):329.
13 Zhu Haitang,Gao Danying,Wang Zhanqiao.Experimental study on fracture properties of hybrid fiber Reinforced high-strength concrete[J].Journal of Building Structures,2010,31(1):41(in Chinese).朱海堂,高丹盈,王占桥.混杂纤维高强混凝土断裂性能试验研究[J].建筑结构学报,2010,31(1):41.
14 Almusallam T,Ibrahim S M,Al Salloum Y,et al.Analytical and experimental investigations on the fracture behavior of hybrid fiber reinforced concrete[J].Cement&Concrete Composites,2016,74(11):201.
15 Liang Ninghui,Liu Xinrong,Sun Ji.Experimental study of crack resistance for multi-scale polypropylene fiber reinforced concrete[J].Journal of China Coal Society,2012,37(8):1304(in Chinese).梁宁慧,刘新荣,孙霁.多尺度聚丙烯纤维混凝土抗裂性能的试验研究[J].煤炭学报,2012,37(8):1304.
16 Song Li,Hu Shisheng.Two wave and three wave method in SHPB data processing[J].Exlposion and Shock Waves,2005,25(1):368(in Chinese).宋力,胡时胜.SHPB数据处理中的二波法与三波法[J].爆炸与冲击,2005,25(1):368.