温度对PVA/ECC动态压缩性能影响

刘泽军; 王昌野; 李艳; 张文彬

doi:10.13801/j.cnki.fhclxb.20220322.001

温度对PVA/ECC动态压缩性能影响

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: TU528.58
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出版历程
- 收稿日期: 2021-12-07
- 修回日期: 2022-02-24
- 录用日期: 2022-03-08
- 网络出版日期: 2022-03-22
- 刊出日期: 2023-01-14

Effect of temperature on dynamic compression properties of PVA/ECC

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

Funds: National Natural Science Foundation of China (U1904188); Key Scientific and Technological Program of Henan Province (222102320431); Project of Fundamental Research Funds for Universities of Henan Province (NSFRF220438)

摘要

摘要: 为研究不同温度、不同聚乙烯醇(PVA)纤维体积掺量和不同应变率对高延性纤维增强水泥基复合材料(PVA/ECC)动态压缩性能的影响，采用直径50 mm分离式霍普金森压杆(SHPB)，对高温浸水冷却后的PVA/ECC进行了冲击压缩试验，结果表明：当温度≥250℃，PVA/ECC试件冲击破坏后的整体性变差，应力-应变曲线更趋于扁平，其动态峰值应变提高不明显但动态峰值应力、冲击韧度显著降低，且高温对较大纤维体积掺量PVA/ECC动态峰值应力、冲击韧度的劣化效应更明显；温度≤150℃时，增大PVA纤维体积掺量，PVA/ECC动态峰值应力、峰值应变和冲击韧度均明显提高，但当温度≥250℃时，增大PVA纤维体积掺量，PVA/ECC动态峰值应变增大，而冲击韧度的提高幅度显著降低且动态峰值应力下降；高温水冷后的PVA/ECC仍具有明显的应变率效应，但温度≥150℃后，其抗压强度的应变率敏感性有所降低。
- 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) /
- 温度 /
- 动态压缩性能
Abstract: In order to study the effects of different temperatures, different polyvinyl alcohol (PVA) fiber contents by volume and different strain rates on the dynamic compressive properties of engineered fiber reinforced cementitious composite (PVA/ECC), impact compression tests were conducted on PVA/ECC after the high-temperature and water-cooled by using a 50 mm diameter split Hopkinson compression bar (SHPB). The results show that when the temperature is greater than or equal to 250℃, the integrity of PVA/ECC specimens becomes worse after impact damage and the stress-strain curves tend to be flatter. The dynamic peak strain doesn’t increase obviously but the dynamic peak stress and impact toughness decrease remarkably. Furthermore, the deterioration effect of high temperature on the dynamic peak stress and impact toughness of PVA/ECC with larger fiber contents by volume is more obvious. When the temperature is less than or equal to 150℃, the dynamic peak stress, peak strain and impact toughness of PVA/ECC improve significantly with increasing the PVA fiber contents by volume. When the temperature is greater than or equal to 250 ℃, the dynamic peak strain increases with increasing the PVA fiber contents by volume, but the improvement extent of impact toughness reduces significantly and the dynamic peak stress decreases. PVA/ECC still has a significant strain rate effect after the high temperature and water-cooled. While when the temperature is greater than or equal to 150 ℃, the strain rate sensitivity of compressive strength reduces.
- engineered fiber reinforced cementitious composite /
- polyvinyl alcohol /
- Hopkinson compression bar (SHPB) /
- temperature /
- dynamic compression property

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图 1 PVA/高延性纤维增强水泥基复合材料(ECC)哑铃型试件单轴受拉试验

Figure 1. Tensile testing of dumbbell-shaped PVA/engineered fiber reinforced cementitious composite (ECC) specimens

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图 2 不同PVA纤维掺量PVA/ECC试件单轴受拉应力-应变曲线

Figure 2. Tensile stress-strain curves of PVA/ECC specimens with different PVA fiber volume contents

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图 3 分离式霍普金森压杆(SHPB)试验装置示意图

Figure 3. Schematic diagram of split Hopkinson compression bar (SHPB) test device

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4 PVA/ECC试件典型破坏形态

4. Typical failure patterns of PVA/ECC specimens

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图 5 PVA/ECC试件SEM图像^[22]

Figure 5. SEM images of PVA/ECC specimens^[22]

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图 6 不同温度下PVA/ECC试件平均应力-应变曲线

Figure 6. Average stress-strain curves of PVA/ECC specimens at different temperatures

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图 7 不同纤维掺量PVA/ECC试件平均应力-应变曲线

Figure 7. Average stress-strain curves of PVA/ECC specimens with different fiber contents

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图 8 不同应变率下PVA/ECC试件平均应力-应变曲线

Figure 8. Average stress-strain curves of PVA/ECC specimens at different strain rates

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图 9 PVA/ECC动态强度增长因子(μ_DIF)与应变率对数lgέ的关系

Figure 9. Relationship between dynamic increase factor (μ_DIF) and logarithm of strain rate lgέ of PVA/ECC

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图 10 不同温度下PVA/ECC试件冲击韧度对比

Figure 10. Impact toughness comparison of PVA/ECC specimens at different temperatures

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图 11 不同纤维掺量PVA/ECC试件冲击韧度对比

Figure 11. Impact toughness comparison of PVA/ECC specimens with different fiber contents

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图 12 不同应变率PVA/ECC试件冲击韧度S_T对比

Figure 12. Impact toughness S_T comparisons of PVA/ECC specimens at different strain rates

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表 1 聚乙烯醇(PVA)纤维性能

Table 1 Properties of polyvinyl alcohol (PVA) fiber

Diameter /μm	Length /mm	Elasticity modulus /GPa	Ultimate strain /%	Tensile strength /MPa	Density /(g·cm⁻³)
39	12	42.8	7.0	1620	1.2

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表 2 PVA/ECC试件拉伸试验结果

Table 2 PVA/ECC specimen tensile test results

Fiber volume fraction/vol%	Ultimate tensile strain ε_tu/%	Tensile strength f_tu/MPa
0.5	0.42	3.01
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试件动态压缩试验结果

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

Specimen	Measured strain rate/s⁻¹	f_cu/MPa	f_c/MPa	f_cd/MPa	ε_P/10⁻⁶	S_T/(MJ·m⁻³)
0.5vol%PVA/ECC-25-70	74	43.47	35.30	52.9	6656	0.912
0.5vol%PVA/ECC -25-90	93			59.8	8200	1.132
0.5vol%PVA/ECC -25-110	110			70.9	8930	1.334
1.0vol%PVA/ECC -25-70	75	44.84	36.89	60.9	7420	1.097
1.0vol%PVA/ECC -25-90	96			69.1	8760	1.449
1.0vol%PVA/ECC -25-110	115			79.9	10630	1.885
1.5vol%PVA/ECC -25-70	71	45.80	37.56	68.0	10540	1.450
1.5vol%PVA/ECC -25-90	92			78.4	11020	1.703
1.5vol%PVA/ECC -25-110	111			87.8	12190	2.301
2.0vol%PVA/ECC -25-70	72	46.20	38.84	74.8	11240	1.738
2.0vol%PVA/ECC -25-90	93			85.1	13650	2.156
2.0vol%PVA/ECC -25-110	112			95.7	14760	2.520
0.5vol%PVA/ECC -150-70	72	45.40	37.20	55.9	6670	0.945
0.5vol%PVA/ECC -150-90	91			63.0	8360	1.182
0.5vol%PVA/ECC -150-110	112			74.9	9030	1.412
1.0vol%PVA/ECC -150-70	73	47.00	39.50	64.9	7550	1.153
1.0vol%PVA/ECC -150-90	89			74.0	8840	1.452
1.0vol%PVA/ECC -150-110	111			82.9	10750	1.877
1.5vol%PVA/ECC -150-70	72	50.10	40.60	71.8	10700	1.456
1.5vol%PVA/ECC -150-90	94			81.4	11160	1.733
1.5vol%PVA/ECC -150-110	113			90.9	12300	2.237
2.0vol%PVA/ECC -150-70	71	51.20	41.70	76.8	11450	1.732
2.0vol%PVA/ECC -150-90	91			89.1	13820	2.131
2.0vol%PVA/ECC -150-110	112			97.0	15100	2.505
0.5vol%PVA/ECC -250-70	73	38.20	31.50	44.8	6920	0.697
0.5vol%PVA/ECC -250-90	95			51.4	8430	0.925
0.5vol%PVA/ECC -250-110	112			58.0	9060	1.093
1.0vol%PVA/ECC -250-70	72	36.80	29.60	42.9	7540	0.777
1.0vol%PVA/ECC -250-90	95			47.1	8930	1.003
1.0vol%PVA/ECC -250-110	111			55.9	11240	1.271
1.5vol%PVA/ECC -250-70	72	35.70	28.50	40.9	10800	0.858
1.5vol%PVA/ECC -250-90	93			43.8	11250	1.016
1.5vol%PVA/ECC -250-110	115			53.1	12350	1.301
2.0vol%PVA/ECC -250-70	73	34.10	27.20	38.5	11460	0.914
2.0vol%PVA/ECC -250-90	91			41.4	14060	1.073
2.0vol%PVA/ECC -250-110	113			50.0	15160	1.328
0.5vol%PVA/ECC -350-70	74	34.60	28.30	38.1	7060	0.593
0.5vol%PVA/ECC -350-90	91			43.9	9140	0.798
0.5vol%PVA/ECC -350-110	112			52.1	9340	0.981
1.0vol%PVA/ECC -350-70	71	32.80	26.90	35.0	7900	0.677
1.0vol%PVA/ECC -350-90	92			39.9	9140	0.889
1.0vol%PVA/ECC -350-110	113			47.8	11260	1.034
1.5vol%PVA/ECC -350-70	72	31.20	25.20	33.3	11350	0.697
1.5vol%PVA/ECC -350-90	91			36.9	11560	0.899
1.5vol%PVA/ECC -350-110	115			44.8	12890	1.037
2.0vol%PVA/ECC -350-70	74	28.30	23.10	29.8	11950	0.737
2.0vol%PVA/ECC -350-90	95			33.1	14130	0.915
2.0vol%PVA/ECC -350-110	115			40.0	15480	1.068
Notes: 0.5vol%PVA/ECC-25-70 represents that the fiber content by volume of PVA/ECC specimen is 0.5vol%, the temperature is 25℃, and the design strain rate is 70 s⁻¹; f_cu—Cubic compressive strength of PVA/ECC; f_c—Axial compressive strength of PVA/ECC; f_cd—Dynamic peak stress of PVA/ECC; ε_P—Dynamic peak strain of PVA/ECC; S_T— Impact toughness of PVA/ECC.

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