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《材料导报》期刊社  2018, Vol. 32 Issue (2): 288-294    https://doi.org/10.11896/j.issn.1005-023X.2018.02.026
  物理   材料研究 ｜材料 |
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
梁宁慧1,2,杨鹏1,2,刘新荣1,2,钟杨1,2,郭哲奇1,2
1 重庆大学土木工程学院,重庆 400045
2 山地城镇建设与新技术教育部重点实验室,重庆 400045
A Study on Dynamic Compressive Mechanical Properties of Multi-size Polypropylene Fiber Concrete Under High Strain Rate
Ninghui LIANG1,2,Peng YANG1,2,Xinrong LIU1,2,Yang ZHONG1,2,Zheqi GUO1,2
1 College of Civil Engineering, Chongqing University, Chongqing 400045
2 Key Laboratory of New Technology for Construction of Cities in Mountain Area, Ministry of Education, Chongqing 400045
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摘要 

采用Φ74 mm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1.2 kg/m 3时混凝土动态极限韧性最高,增幅为121.11%。

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梁宁慧
杨鹏
刘新荣
钟杨
郭哲奇
关键词:  聚丙烯纤维混凝土  SHPB  多尺寸  应变率效应  动力特性    
Abstract: 

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%.

Key words:  polypropylene fiber reinforced concrete    SHPB    multi-size    strain rate effect    dynamic characteristics
               出版日期:  2018-01-25      发布日期:  2018-01-25
ZTFLH:  TU37  
基金资助: 国家自然科学基金(41372356);重庆市基础与前沿研究计划项目(cstc2013jcyjA30005);重庆市研究生科研创新项目资助(CYS16005)
引用本文:    
梁宁慧,杨鹏,刘新荣,钟杨,郭哲奇. 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[J]. 《材料导报》期刊社, 2018, 32(2): 288-294.
Ninghui LIANG,Peng YANG,Xinrong LIU,Yang ZHONG,Zheqi GUO. A Study on Dynamic Compressive Mechanical Properties of Multi-size Polypropylene Fiber Concrete Under High Strain Rate. Materials Reports, 2018, 32(2): 288-294.
链接本文:  
http://www.mater-rep.com/CN/10.11896/j.issn.1005-023X.2018.02.026  或          http://www.mater-rep.com/CN/Y2018/V32/I2/288
Fiber
number		 Diameter
mm		 Length
mm		 Tensile strength
MPa		 Elastic modulus
GPa		 Elongation
at break/%		 Density
g/cm3		 Recommended
dosage/(kg/m3)
F1 0.026 19 641 4.5 40 0.91 0.9
F2 0.1 19 322 4.9 15 0.91 0.9
C1 0.8 50 706 7.4 10 0.95 6.0
表1  聚丙烯纤维的物理力学指标
Power
level		 Cement
kg/m3		 Sand
kg/m3		 Stone
kg/m3		 Water
kg/m3		 Water plastic
ratio		 Gravel diameter
mm		 Sand
rate/%		 Water-reducing
agent/(kg/m3)
C30 380 701 1 144 175 0.461 5—10 38 3.8
表2  混凝土配合比
Test piece
number		 Fiber type Fiber content
%		 Average static
compressive
strength/MPa
A0 Nothing 0 29.6
A1 F1 0.1 30.3
A2 F2 0.1 30.2
A3 C1 0.6 35.6
A4 F1+F2+C1 0.05+0.05+0.5 43.3
A5 F1+F2+C1 0.06+0.06+0.48 48.4
表3  试件编号及平均静力抗压强度
图1  Φ74 mm SHPB装置
图2  加工好的部分试件
Material Impact
load
MPa		 Average
strain
rate/s-1		 Dynamic
compressive
strength/MPa		 Dynamic strength
enhancement
factor		 Peak
strain
10-3		 Ultimate
strain
10-3		 Peak
toughness
kJ·m-3		 Ultimate
toughness
kJ·m-3
A0 0.3 34 45.13 1.525 3.79 17.11 112.1 468.8
0.35 63 48.2 1.628 4.276 12.58 143.2 419.7
0.4 74 50.2 1.696 4.173 13.57 153.3 484.1
0.45 89 52.23 1.765 4.824 14.35 188.1 540.3
0.5 113 55.42 1.872 3.959 16.3 163.9 657.5
A1 0.3 30 47.27 1.56 6.445 14.52 222 486.4
0.35 58 54.02 1.783 5.982 15.77 219.2 571.1
0.4 83 53.65 1.771 7.424 16.86 300 646
0.45 95 53.4 1.762 7.386 19.86 255.9 661.7
0.5 104 60.75 2.005 8.8 19.83 408.6 834.9
A2 0.3 32 47.84 1.584 5.046 14.39 162.4 427.9
0.35 68 51.06 1.691 5.956 16.48 230 546.7
0.4 85 55.91 1.851 5.69 16.26 230.1 610.5
0.45 96 57.45 1.902 6.638 18.92 304 789.3
0.5 103 60.92 2.017 8.887 18.69 433.7 809.2
A3 0.3 28 68.78 1.932 5.405 16.49 252 759.3
0.35 61 70.72 1.987 4.067 14.46 205 624.3
0.4 78 75.32 2.116 5.383 18.13 302.1 892.9
0.45 96 85.91 2.413 8.268 18.59 516.5 1 119.5
0.5 108 92.9 2.61 5.132 17.53 338.2 998.1
A4 0.3 34 58.01 1.339 2.758 11.88 99.5 414.4
0.35 73 62.38 1.441 3.035 13.93 139 516.7
0.4 87 63.66 1.47 6.031 23.5 315.6 936.8
0.45 93 72.26 1.669 7.415 24.11 424.6 1 150.6
0.5 108 74.1 1.711 2.944 20.21 164.5 941.6
A5 0.3 36 60.16 1.243 1.768 17.16 74.4 550
0.35 69 73.83 1.525 3.626 18.69 190.6 780.8
0.4 76 72.02 1.488 6.66 21.1 364.5 1 070.4
0.45 87 78.09 1.613 8.14 22.28 446 1 066.4
0.5 102 90.97 1.88 8.225 19.99 534.8 1 149.4
表4  聚丙烯纤维混凝土SHPB试验结果
图3  不同应变率下素混凝土和纤维混凝土的应力-应变曲线
图4  不同应变率下MPFC的动态抗压强度
图5  不同应变率下MPFC的动态强度增长因子
图6  不同应变率下MPFC的动态峰值应变
图7  不同应变率下MPFC的动态极限应变
图8  不同应变率下MPFC的动态峰值韧性
图9  不同应变率下MPFC的动态极限韧性
图10  素混凝土和纤维混凝土典型破坏形态
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