聚乙烯醇纤维混凝土动态断裂过程试验研究

摘要/Abstract

摘要： 为探究纤维体积掺量对聚乙烯醇纤维增强水泥基复合材料(PVA-ECC)断裂过程的影响,基于50 mm的分离式霍普金森压杆(SHPB)装置对不同纤维体积掺量(0%、0.75%、1.50%、2.25%、3.00%)的PVA-ECC中心切槽半圆盘弯曲(NSCB)试件进行冲击试验,同时结合超高速数字图像(DIC)相关试验系统对PVA-ECC材料的动态断裂过程进行试验研究,得到了预制裂纹尖端张开位移的变化规律以及各组试件的临界裂缝尖端张开位移(CTOD_C)。结果表明,当不添加PVA纤维或添加较少(小于1.50%)时,裂尖宏观裂纹基本出现在裂尖荷载的峰值时刻处,而随着PVA纤维掺量的增加,裂尖宏观裂纹的出现显著早于裂尖荷载的峰值时刻,并且纤维体积掺量越大,裂尖宏观裂纹出现得越早,裂纹扩展至完全断裂的时间也显著增加。添加聚乙烯醇纤维可以显著提高混凝土试件的CTOD_C值,提高试件的阻裂能力,相同冲击荷载下,体积掺量为2.25%的聚乙烯醇纤维试件具有较大的CTOD_C值。

关键词: PVA-ECC, 分离式霍普金森压杆, 中心切槽半圆盘弯曲试件, 动态断裂韧度, 数字图像相关, 裂缝尖端张开位移

Abstract: In order to explore the effect of fiber volume content on the fracture process of polyvinyl alcohol fiber reinforced engineering cementitious composites (PVA-ECC), the split Hopkinson pressure bar (SHPB) device based on 50 mm was used for different fiber volume content (0%, 0.75%, 1.50%, 2.25%, 3.00%) of PVA-ECC notched semi-circular bend (NSCB) specimens for impact test, and combined with ultra-high-speed digital image correlate (DIC) test system for PVA-ECC materials. The dynamic fracture process was experimentally studied, and the variation law of the prefabricated crack tip opening displacement and the critical crack tip opening displacement (CTOD_C) value of each group of specimens were obtained. The results show that when no PVA fiber is added or a small amount (less than 1.50%) is added, the macroscopic crack at the crack tip appears basically at the peak moment of the crack tip load, and with the increase of the PVA fiber content, the macroscopic crack at the crack tip appears. It appears significantly earlier than the peak time of the crack tip load, and the larger the fiber volume content is, the earlier the crack tip macro crack appears, and the time for the crack to expand to complete fracture also increases significantly. The addition of polyvinyl alcohol fibers significantly improves the performance of concrete specimens. The increase of CTOD_C value can improve the crack resistance of the specimen. Under the same impact load, the specimen added with 2.25% polyvinyl alcohol fiber has a larger CTOD_C value.

Key words: PVA-ECC, split Hopkinson press bar, notched semi-circular bend specimen, dynamic fracture toughness, digital image correlate, crack tip opening displacement

中图分类号:

TU452

杨国梁, 李峰, 张志飞, 毕京九, 董智文, 李影. 聚乙烯醇纤维混凝土动态断裂过程试验研究[J]. 硅酸盐通报, 2023, 42(2): 454-462.

YANG Guoliang, LI Feng, ZHANG Zhifei, BI Jingjiu, DONG Zhiwen, LI Ying. Experimental Study on Dynamic Fracture Process of Polyvinyl Alcohol Fiber Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(2): 454-462.

参考文献

[1] LI V C, LEUNG C K Y. Steady-state and multiple cracking of short random fiber composites[J]. Journal of Engineering Mechanics, 1992, 118(11): 2246-2264.
[2] MAALEJ M, LI V C, HASHIDA T. Effect of fiber rupture on tensile properties of short fiber composites[J]. Journal of Engineering Mechanics, 1995, 121(8): 903-913.
[3] FISCHER G. Deformation behavior of reinforced ECC flexural members under reversed cyclic loading conditions[D]. Michigan: University of Michigan, 2002.
[4] 李庆华, 赵昕, 徐世烺. 纳米二氧化硅改性超高韧性水泥基复合材料冲击压缩试验研究[J]. 工程力学, 2017, 34(2): 85-93.
LI Q H, ZHAO X, XU S L. Impact compression properties of nano-SiO₂ modified ultra high toughness cementitious composites using a split hopkinson pressure bar[J]. Engineering Mechanics, 2017, 34(2): 85-93 (in Chinese).
[5] 张君, 公成旭. 高韧性纤维增强水泥基复合材料单轴抗拉性能研究[C]//纤维混凝土的技术进展与工程应用: 第十一届全国纤维混凝土学术会议论文集. 大连, 2006: 35-40.
ZHANG J, GONG C X. Uniaxial tensile properties of high toughness fiber reinforced cement-based composites[C]//Technical Progress and Engineering Application of Fiber Reinforced Concrete: Proceedings of the 11th National Fiber Reinforced Concrete Conference. Dalian, 2006: 35-40 (in Chinese).
[6] 王玉清, 孙亮, 刘曙光, 等. 不同纤维掺量下聚乙烯醇纤维/水泥复合材料徐变性能试验[J]. 复合材料学报, 2020, 37(1): 205-213.
WANG Y Q, SUN L, LIU S G, et al. Experimental study on creep performance of polyvinyl alcohol fiber/engineered cementitious composite with different fiber contents[J]. Acta Materiae Compositae Sinica, 2020, 37(1): 205-213 (in Chinese).
[7] MOHAMMED B S, KHED V C, LIEW M S. Optimization of hybrid fibres in engineered cementitious composites[J]. Construction and Building Materials, 2018, 190: 24-37.
[8] 徐世烺, 李贺东. 超高韧性水泥基复合材料研究进展及其工程应用[J]. 土木工程学报, 2008, 41(6): 45-60.
XU S L, LI H D. A review on the development of research and application of ultra high toughness cementitious composites[J]. China Civil Engineering Journal, 2008, 41(6): 45-60 (in Chinese).
[9] 徐世烺, 蔡向荣. 超高韧性纤维增强水泥基复合材料基本力学性能[J]. 水利学报, 2009, 40(9): 1055-1063.
XU S L, CAI X R. Experimental study on mechanical properties of ultra-high toughness fiber reinforced cementitious composite[J]. Journal of Hydraulic Engineering, 2009, 40(9): 1055-1063 (in Chinese).
[10] 谢磊, 李庆华, 徐世烺. 超高韧性水泥基复合材料多次冲击压缩性能及本构关系[J]. 工程力学, 2021, 38(12): 158-171.
XIE L, LI Q H, XU S L. Multiple impact compressive properties and constitutive model of ultra-high toughness cementitious composites[J]. Engineering Mechanics, 2021, 38(12): 158-171 (in Chinese).
[11] 谢磊, 李庆华, 徐世烺. 纤维掺量对聚乙烯醇纤维增强水泥基复合材料动态压缩性能的影响[J]. 复合材料学报, 2021, 38(9): 3086-3100.
XIE L, LI Q H, XU S L. Influence of fiber volume fraction on dynamic compressive properties of polyvinyl alcohol fiber reinforced cementitious composites[J]. Acta Materiae Compositae Sinica, 2021, 38(9): 3086-3100 (in Chinese).
[12] 祝和意, 张少峰. PVA纤维体积率对PVA-ECC力学性能的影响[J]. 材料导报, 2018, 32(18): 3266-3270+3275.
ZHU H Y, ZHANG S F. Effect of PVA fiber volume fraction on the mechanical properties of PVA-ECC[J]. Materials Review, 2018, 32(18): 3266-3270+3275 (in Chinese).
[13] 罗毅, 杨才千, 李科锋, 等. 早强自密实PVA-ECC抗折性能试验研究[J]. 硅酸盐通报, 2019, 38(8): 2606-2613.
LUO Y, YANG C Q, LI K F, et al. Experimental study on the flexural performance of early-strength self-compacting PVA-ECC[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(8): 2606-2613 (in Chinese).
[14] LIEW M S, ASWIN M, DANYARO K U, et al. Investigation of fibers reinforced engineered cementitious composites properties using quartz powder[J]. Materials, 2020, 13(11): 2428.
[15] MERCHANT B, GELOT A. Evaluation of engineering cementitious composites (ECC) with different percentage of fibers[J]. Esrsa Publications, 2015, 4(6): 40-43.
[16] 殷亚娟, 任青文, 沈雷, 等. 基于分形维的混凝土裂纹扩展及损伤演化过程研究[J]. 水利学报, 2021, 52(11): 1270-1280.
YIN Y J, REN Q W, SHEN L, et al. Study on crack propagation and damage evolution process of concrete based on fractal dimension[J]. Journal of Hydraulic Engineering, 2021, 52(11): 1270-1280 (in Chinese).
[17] ZHOU Y X, XIA K, LI X B, et al. Suggested methods for determining the dynamic strength parameters and mode-I fracture toughness of rock materials[J]. International Journal of Rock Mechanics and Mining Sciences, 2012, 49: 105-112.
[18] 徐世烺, 张秀芳, 卜丹. 混凝土裂缝扩展过程中裂尖张开口位移(CTOD)与裂缝嘴张开口位移(CMOD)的变化关系分析[J]. 工程力学, 2011, 28(5): 64-70.
XU S L, ZHANG X F, BU D. Relationship between crack tip opening displacement (CTOD) and crack mouth opening displacement (CMOD) throughtout development of concrete crack[J]. Engineering Mechanics, 2011, 28(5): 64-70 (in Chinese).
[19] 徐世烺, 赵艳华. 混凝土裂缝扩展的断裂过程准则与解析[J]. 工程力学, 2008, 25(s2): 20-33.
XU S L, ZHAO Y H. Analysis and criterion of fracture process for crack propagation in concrete[J]. Engineering Mechanics, 2008, 25(s2): 20-33 (in Chinese).
[20] 吴智敏, 赵国藩. 混凝土裂缝扩展的CTOD_C准则[J]. 大连理工大学学报, 1995, 35(5): 699-702.
WU Z M, ZHAO G F. CTOD_C criteria for crack propagation of concrete[J]. Journal of Dalian University of Technology, 1995, 35(5): 699-702 (in Chinese).
[21] 徐世烺, 赵国藩. 混凝土裂缝的稳定扩展过程与临界裂缝尖端张开位移[J]. 水利学报, 1989, 20(4): 33-44.
XU S L, ZHAO G F. The stable propagation of crack in concrete and the determination of critical crack tip opening displacement[J]. Journal of Hydraulic Engineering, 1989, 20(4): 33-44 (in Chinese).
[22] NIU Y F, HUANG H L, ZHANG J, et al. Development of the strain field along the crack in ultra-high-performance fiber-reinforced concrete (UHPFRC) under bending by digital image correlation technique[J]. Cement and Concrete Research, 2019, 125: 105821.
[23] YU K Q, YU J T, DAI J G, et al. Development of ultra-high performance engineered cementitious composites using polyethylene (PE) fibers[J]. Construction and Building Materials, 2018, 158: 217-227.
[24] NUNES L C S, REIS J M L. Estimation of crack-tip-opening displacement and crack extension of glass fiber reinforced polymer mortars using digital image correlation method[J]. Materials & Design, 2012, 33: 248-253.
[25] WU Z M, RONG H, ZHENG J J, et al. An experimental investigation on the FPZ properties in concrete using digital image correlation technique[J]. Engineering Fracture Mechanics, 2011, 78(17): 2978-2990.
[26] 潘兵, 吴大方, 夏勇. 数字图像相关方法中散斑图的质量评价研究[J]. 实验力学, 2010, 25(2): 120-129.
PAN B, WU D F, XIA Y. Study of speckle pattern quality assessment used in digital image correlation[J]. Journal of Experimental Mechanics, 2010, 25(2): 120-129 (in Chinese).