不同长径比聚乙烯醇(PVA)/高延性纤维增强水泥基复合材料(ECC)动态压缩性能

刘泽军; 赵柳; 李艳; 褚颜贵

doi:10.13801/j.cnki.fhclxb.20230411.002

不同长径比聚乙烯醇(PVA)/高延性纤维增强水泥基复合材料(ECC)动态压缩性能

doi: 10.13801/j.cnki.fhclxb.20230411.002

河南理工大学　土木工程学院，焦作 454003

基金项目: 国家自然科学基金(U1904188)；河南省科技攻关项目(222102320431)；河南省高校基本科研业务费专项资金资助项目(NSFRF220438)

详细信息

通讯作者:
李艳，博士，教授，硕士生导师，研究方向为高性能混凝土及其结构设计　E-mail: liyan@hpu.edu.cn

中图分类号: TB33；TU528.58
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- 被引次数: 0
出版历程
- 收稿日期: 2023-02-20
- 修回日期: 2023-03-30
- 录用日期: 2023-04-05
- 网络出版日期: 2023-04-12
- 刊出日期: 2023-12-01

Dynamic compression property of polyvinyl alcohol (PVA)/engineered fiber reinforced cementitious composite (ECC) with different length-diameter ratios

School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454003, China

Funds: National Natural Science Foundation of China (U1904188); Science and Technology Project of Henan Province (222102320431); Fundamental Research Funds of Henan Province Universities (NSFRF220438)

摘要

摘要: 基于杆径为50 mm的分离式霍普金森压杆装置(SHPB)研究了不同长径比和不同聚乙烯醇(PVA)纤维体积掺量的高延性纤维增强水泥基复合材料(PVA/ECC)在4种应变率下的动态压缩性能。结果表明：长径比较大(l/D>1.0)的PVA/ECC试件冲击压缩后更易产生方向性明显的滑移破坏，其应力-应变曲线平台期的长度明显缩短，且曲线所包围的面积也明显减小；PVA/ECC的动态峰值应力、峰值应变和冲击韧性均随长径比增加而降低，存在一定的尺寸效应，且应变率越高、PVA纤维体积掺量越小，长径比的影响更明显；长径比较大的PVA/ECC试件其应变率效应有所减弱但PVA纤维的强化效应有所提升，尤其是对冲击韧性的影响程度最显著。
- 高延性纤维增强水泥基复合材料 /
- 聚乙烯醇 /
- 分离式霍普金森压杆 (SHPB) /
- 长径比 /
- 动态压缩性能
Abstract: The dynamic compression properties of engineered fiber reinforced cementitious composite (PVA/ECC) with different length-diameter ratio and different polyvinyl alcohol (PVA) fiber contents by volume subjected to four different strain rates were investigated by using a 50 mm diameter split Hopkinson pressure bar (SHPB). The results show that PVA/ECC specimens with larger length-diameter ratio (l/D>1.0) are more prone to directional slip failure after impact compression damage. Furthermore, the length of plateau period of stress-strain curve is obviously shortened and the area surrounded by the curve is also significantly reduced. The dynamic peak stress, peak strain and impact toughness of PVA/ECC decrease significantly with the increase of length-diameter ratio, which reveals the existence of a certain size effect, and that the higher the strain rate or the smaller PVA fiber contents by volume is the more obvious the influence of length-diameter ratio will be. The strain rate effect of PVA/ECC specimens with larger length-diameter ratio may become not obvious, but the strengthening effect of PVA fiber become more obvious, which effect is the most significant on impact toughness.
- engineered fiber reinforced cementitious composite /
- polyvinyl alcohol /
- split Hopkinson pressure bar (SHPB) /
- length-diameter ratio /
- dynamic compression property

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图 1 不同长径比(l/D)的PVA/ECC试件

Figure 1. PVA/ECC specimens with different length-diameter ratios (l/D)

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图 2 分离式霍普金森压杆(SHPB)试验装置示意图

Figure 2. Schematic diagram of split Hopkinson pressure bar (SHPB) test device

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图 3 PVA/ECC试件典型破坏形态

Figure 3. Typical failure patterns of PVA/ECC specimens

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图 4 不同长径比PVA/ECC试件动态平均应力-应变曲线示例

Figure 4. Dynamic stress-strain curves of PVA/ECC specimens with different length-diameter ratios

σ₁—Dynamic yield stress

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图 5 不同应变率下PVA/ECC试件动态平均应力-应变曲线示例

Figure 5. Dynamic stress-strain curves of PVA/ECC specimens at different strain rates

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图 6 不同纤维掺量PVA/ECC试件动态平均应力-应变曲线示例

Figure 6. Dynamic stress-strain curves of PVA/ECC specimens with different fiber contents

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图 7 不同长径比PVA/ECC动态峰值应力变化趋势

Figure 7. Dynamic peak stress of PVA/ECC with different length-diameter ratios

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图 8 不同长径比PVA/ECC动态峰值应变变化趋势

Figure 8. Dynamic peak strain of PVA/ECC with different length-diameter ratios

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图 9 不同长径比下PVA/ECC冲击韧性变化趋势

Figure 9. Impact toughness of PVA/ECC at different length-diameter ratios

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表 1 聚乙烯醇(PVA)纤维性能

Table 1. Properties of polyvinyl alcohol (PVA) fiber

Length-diameter ratio	Length /mm	Elasticity modulus /GPa	Ultimate strain /%	Tensile strength /MPa	Density /(g·cm⁻³)
3000	12	42.8	7.0	1620	1.2

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表 2 PVA/高延性纤维增强水泥基复合材料(ECC)试件拉伸试验结果^[11]

Table 2. PVA/engineered fiber reinforced cementitious composite (ECC) specimen tensile test results^[11]

Fiber volume content/vol%	Ultimate tensile strain ε_tu/%	Tensile strength f_tu/MPa
1.0	1.64	3.64
1.5	2.81	4.16
2.0	3.21	4.44

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表 3 PVA/ECC试件动态冲击压缩试验结果

Table 3. Test results of PVA/ECC specimens under dynamic compression

Specimen	l/D	Strain rate/s⁻¹	Fiber volume content/vol%	f_cd /MPa	ε_p/10⁻⁶	W_T/(MJ·m⁻³)
1.0%PVA/ECC(0.5)-50	0.5	50	1.0	56.31	10275	1.04
1.5%PVA/ECC(0.5)-50			1.5	59.52	10980	1.15
2.0%PVA/ECC(0.5)-50			2.0	65.64	12280	1.21
1.0%PVA/ECC(0.5)-75		75	1.0	62.67	11340	1.21
1.5%PVA/ECC(0.5)-75			1.5	66.85	12148	1.57
2.0%PVA/ECC(0.5)-75			2.0	74.34	14050	1.72
1.0%PVA/ECC(0.5)-100		100	1.0	70.25	12705	1.74
1.5%PVA/ECC(0.5)-100			1.5	75.29	13640	2.05
2.0%PVA/ECC(0.5)-100			2.0	84.68	15203	2.38
1.0%PVA/ECC(0.5)-125		125	1.0	79.04	14070	2.50
1.5%PVA/ECC(0.5)-125			1.5	85.58	15460	2.75
2.0%PVA/ECC(0.5)-125			2.0	95.18	17013	3.21
1.0%PVA/ECC(0.6)-50	0.6	50	1.0	53.29	9165	0.82
1.5%PVA/ECC(0.6)-50			1.5	57.66	9810	0.99
2.0%PVA/ECC(0.6)-50			2.0	63.26	11100	1.06
1.0%PVA/ECC(0.6)-75		75	1.0	58.35	10120	1.05
1.5%PVA/ECC(0.6)-75			1.5	62.79	10730	1.37
2.0%PVA/ECC(0.6)-75			2.0	70.46	12640	1.47
1.0%PVA/ECC(0.6)-100		100	1.0	65.00	11150	1.44
1.5%PVA/ECC(0.6)-100			1.5	70.31	12030	1.74
2.0%PVA/ECC(0.6)-100			2.0	79.81	13750	2.04
1.0%PVA/ECC(0.6)-125		125	1.0	72.75	12190	1.91
1.5%PVA/ECC(0.6)-125			1.5	79.70	13374	2.31
2.0%PVA/ECC(0.6)-125			2.0	89.67	15360	2.74
1.0%PVA/ECC(0.8)-50	0.8	50	1.0	50.48	7631	0.59
1.5%PVA/ECC(0.8)-50			1.5	54.56	8319	0.74
2.0%PVA/ECC(0.8)-50			2.0	60.96	9460	0.81
1.0%PVA/ECC(0.8)-75		75	1.0	54.21	8471	0.75
1.5%PVA/ECC(0.8)-75			1.5	58.82	9147	0.85
2.0%PVA/ECC(0.8)-75			2.0	66.77	10728	1.19
1.0%PVA/ECC(0.8)-100		100	1.0	59.43	9357	1.00
1.5%PVA/ECC(0.8)-100			1.5	65.29	10040	1.30
2.0%PVA/ECC(0.8)-100			2.0	75.20	11560	1.64
1.0%PVA/ECC(0.8)-125		125	1.0	66.57	10336	1.32
1.5%PVA/ECC(0.8)-125			1.5	73.97	11520	1.67
2.0%PVA/ECC(0.8)-125			2.0	84.10	13580	2.05
1.0%PVA/ECC(1.0)-50	1.0	50	1.0	47.56	6724	0.44
1.5%PVA/ECC(1.0)-50			1.5	51.81	7400	0.52
2.0%PVA/ECC(1.0)-50			2.0	58.91	8655	0.66
1.0%PVA/ECC(1.0)-75		75	1.0	49.93	7280	0.49
1.5%PVA/ECC(1.0)-75			1.5	54.69	7909	0.70
2.0%PVA/ECC(1.0)-75			2.0	62.86	9580	0.85
1.0%PVA/ECC(1.0)-100		100	1.0	53.96	8081	0.65
1.5%PVA/ECC(1.0)-100			1.5	60.46	8770	0.92
2.0%PVA/ECC(1.0)-100			2.0	70.63	10470	1.25
1.0%PVA/ECC(1.0)-125		125	1.0	60.51	8810	0.91
1.5%PVA/ECC(1.0)-125			1.5	68.18	9778	1.17
2.0%PVA/ECC(1.0)-125			2.0	78.73	11187	1.64
1.0%PVA/ECC(1.3)-50	1.3	50	1.0	45.70	5805	0.31
1.5%PVA/ECC(1.3)-50			1.5	50.25	6368	0.40
2.0%PVA/ECC(1.3)-50			2.0	57.35	7418	0.50
1.0%PVA/ECC(1.3)-75		75	1.0	47.68	6329	0.35
1.5%PVA/ECC(1.3)-75			1.5	52.70	6833	0.52
2.0%PVA/ECC(1.3)-75			2.0	61.08	8090	0.67
1.0%PVA/ECC(1.3)-100		100	1.0	50.98	6868	0.48
1.5%PVA/ECC(1.3)-100			1.5	58.21	7536	0.74
2.0%PVA/ECC(1.3)-100			2.0	68.49	8990	0.98
1.0%PVA/ECC(1.3)-125		125	1.0	57.24	7552	0.63
1.5%PVA/ECC(1.3)-125			1.5	65.27	8325	0.88
2.0%PVA/ECC(1.3)-125			2.0	76.25	9560	1.21
1.0%PVA/ECC(1.5)-50	1.5	50	1.0	43.75	4911	0.24
1.5%PVA/ECC(1.5)-50			1.5	48.38	5336	0.35
2.0%PVA/ECC(1.5)-50			2.0	56.10	6705	0.46
1.0%PVA/ECC(1.5)-75		75	1.0	45.49	5250	0.30
1.5%PVA/ECC(1.5)-75			1.5	50.68	5770	0.43
2.0%PVA/ECC(1.5)-75			2.0	59.25	7100	0.59
1.0%PVA/ECC(1.5)-100		100	1.0	48.43	5740	0.40
1.5%PVA/ECC(1.5)-100			1.5	55.72	6305	0.61
2.0%PVA/ECC(1.5)-100			2.0	66.40	7680	0.85
1.0%PVA/ECC(1.5)-125		125	1.0	53.88	6317	0.48
1.5%PVA/ECC(1.5)-125			1.5	62.43	7034	0.75
2.0%PVA/ECC(1.5)-125			2.0	73.70	8560	1.08
Notes: 1.0%PVA/ECC(0.5)-50—Length-diameter ratio of PVA/ECC specimen is 0.5, the design strain rate is 50 s⁻¹, and the fiber content by volume of PVA/ECC specimen is 1.0vol%. f_cd—Dynamic peak stress of PVA/ECC; ε_p—Dynamic peak strain of PVA/ECC; W_T—Impact toughness of PVA/ECC.

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