多组合混杂纤维改性再生混凝土循环受压性能试验

陈宇良; 王琦; 梁鑫; 陆大敏

多组合混杂纤维改性再生混凝土循环受压性能试验

陈宇良^{1, 2, ,},
王琦¹,
梁鑫^{1, 2},
陆大敏^{1, 2}

1.
广西科技大学土木建筑工程学院, 柳州 545006
2.
广西科技大学柳州市绿色先进土木工程材料应用重点实验室, 柳州 545006

基金项目: 中国博士后科学基金(2021M693854)；广西自然科学基金(2019GXNSFBA245030)；广西科技大学博士基金项目(校科博18Z09)

详细信息

通讯作者:
陈宇良，副教授，硕士生导师，研究方向为再生混凝土结构、钢-混凝土组合结构　E-mail: ylchen@gxust.edu.cn

中图分类号: TU528
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- 被引次数: 0
出版历程
- 收稿日期: 2022-08-18
- 修回日期: 2022-09-20
- 录用日期: 2022-10-15
- 网络出版日期: 2022-10-27
- 刊出日期: 2023-08-15

Effect of multi-composite hybrid fiber on cyclic compression performance of recycled concrete

CHEN Yuliang^{1, 2
, ,},
WANG Qi¹,
LIANG Xin^{1, 2},
LU Damin^{1, 2}

1.
School of Civil Engineering and Architecture, Guangxi University of Science and Technology, Liuzhou 545006, China
2.
Liuzhou Key Laboratory of Green Advanced Civil Engineering Materials Application, Guangxi University of Science and Technology, Liuzhou 545006, China

Funds: Postdoctoral Science Foundation of China (2021 M693854); the Guangxi Natural Science Foundation Program, China (2019 GXNSFBA245030); Doctoral Foundation of Guangxi University of Science and Technology (18 Z09)

摘要

摘要: 纤维再生混凝土作为一种绿色环保型复合材料，可以有效的缓解建筑垃圾造成的环境问题，符合我国可持续发展的要求，并且由于纤维的阻裂作用，相比普通再生混凝土，其力学性能更加优异。与单独掺入某一种纤维相比，混杂纤维可在不同时期和尺寸上发挥不同的阻裂效果，对再生混凝土性能的增强效果更加全面，但由于对混杂纤维增强机理研究的缺乏，导致目前它应用在实际工程上存在困难。本文分别对钢-聚丙烯纤维(SF-PF)、钢-聚乙烯醇纤维(SF-PVA)、钢-玻璃纤维(SF-GF)和钢-碳纤维(SF-CF)等混杂纤维再生混凝土(HFRAC)组合在循环受压下进行研究，观察了HFRAC的破坏形态，如图1所示。分析了HFRAC在单轴循环受压曲线的全过程和纤维阻裂机理，如图2所示。根据试验结果，分析了不同混杂纤维组合对再生混凝土循环受压性能下刚度退化和能量耗散等参数的影响。结果表明:SF-CF混杂纤维对再生混凝土刚度退化率的增加和滞回耗能能力提高有显著作用，掺入1.0%SF+0.5%CF时再生混凝土的刚度退化率增加了43.4%。最后，基于试验数据，建立了混杂纤维再生混凝土循环受压应力-应变关系方程。1HFRAC单轴循环受压全过程图2 试件的典型破坏图Whole process of HFRAC uniaxial cycle compression.(a) Unaixal cyclic compression process (b) Failure mechanism in compression process
- 再生混凝土 /
- 循环受压 /
- 混杂纤维 /
- 刚度退化 /
- 能量耗散
Abstract: In order to study the effect of multi-composite hybrid fiber on the cyclic compression behavior of recycled concrete (HFRAC), monotone compression tests and monotone cyclic compression tests were carried out on 84 specimens. The effects of steel-carbon fiber (SF-CF), steel-glass fiber (SF-GF) steel-polypropylene fiber (SF-PF) and steel-polyvinyl alcohol fiber (SF-PVA) on the cyclic compression properties were analyzed. The results show that compared with ordinary recycled concrete, the failure mode of HFRAC is ductile failure, the envelope of stress-strain curve of HFRAC specimens under cyclic compression is approximately consistent with the stress-strain curve under monotonic compression, and the inhibition effect of SF-GF hybrid fiber and SF-PVA hybrid fiber on plastic strain accumulation is better than that of steel fiber recycled concrete. The addition of SF-CF hybrid fiber with large elastic modulus plays a significant role in increasing the stiffness degradation rate and hysteretic energy dissipation capacity of recycled concrete, and the stiffness degradation rate of recycled concrete increases by 43.4% when 1.0vol%SF+0.5vol%CF was added. Finally, on the basis of the experimental results, the full curve equation of stress-strain relationship of HFRAC under uniaxial cyclic compression is established, and the calculated results are in good agreement with the experimental results.
- recycled aggregate concrete /
- uniaxial cyclic compression /
- hybrid fiber /
- stiffness degradation /
- energy dissipation

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图 1 纤维外观特征

Figure 1. Appearance characteristics of fiber

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图 2 试验加载装置及加载制度

Figure 2. Loading device and loading procedure

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图 3 混杂纤维改性再生混凝土(HFRAC)试件的典型破坏图

Figure 3. Typical damage figure of the hybrid fiber reinforced recycled concrete (HFRAC) specimen

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图 4 HFRAC单轴循环受压全过程

Figure 4. Whole process of HFRAC uniaxial cycle compression

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图 5 典型的HFRAC循环荷载受压应力-应变全曲线

Figure 5. Typical cyclic compressive stress-strain curves of HFRAC specimens

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图 6 HFRAC卸载点应变与塑性应变关系

Figure 6. Relationship curves between plastic strain and unloading point strain of HFRAC

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图 7 HFRAC刚度退化率与循环次数的关系曲线

Figure 7. Relationship curve between stiffness ratio and cycle number of HFRAC

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图 8 HFRAC的滞回耗散能量

Figure 8. Hysteenergy of HFRAC

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图 9 纤维的微观视角

Figure 9. Microscopic view of fiber

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图 10 a、b计算值和建议值对比

Figure 10. Comparison of the calculated values and the suggested values of a, b

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图 11 HFRAC循环本构关系模型验证

Figure 11. Verification of the HFRAC cycle constitutive relationship model

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表 1 粗骨料(RA)的物理性能

Table 1. Basic properties of natural and recycled coarse aggregates (RA)

Property	Apparent density/(kg·m³)	Bulk density/(kg·m³)	Water absorption/%	Crushing index/%
Value	2580	1321	5.35	25.63

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表 2 纤维的物理和力学性能

Table 2. Details of the physical and mechanical properties for fibers

Parameter	l_f/mm	d_f/mm	Aspect ratio l_f/d_f	Density/(g·cm⁻³)	Tensile strength /MPa	Elastic modulus /GPa
Stripped corrugated steel fiber(SF)	35	0.58	60	7.80	≥1150	200
Carbon fiber (CF)	15	0.07	214	1.76	≥3000	205
Glass fiber (GF)	15	0.01	1500	0.91	350-400	95
Polyvinyl alcohol fiber (PVA)	17	0.04	450	1.29	1800-1900	40
Polypropylene fiber (PF)	14	0.03	400	0.91	500-600	4.09
Notes：l_f—Length of the fiber; d_f—Diameter of the fiber.

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表 3 混凝土的配合比

Table 3. Concrete matrix mix proportion

Strength grade	Water-binder ratio w/c	Sediment charge/%	RCA replacement rate/%	Material amounts/(kg·m⁻³)
Strength grade	Water-binder ratio w/c	Sediment charge/%	RCA replacement rate/%	Cement	Water	Additional water	Sand	RA
C35	0.41	32	100	500	254.8	25.0	542	1153

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