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

doi:10.13801/j.cnki.fhclxb.20221024.004

多组合混杂纤维改性再生混凝土循环受压性能试验

doi: 10.13801/j.cnki.fhclxb.20221024.004

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，博士，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；TB333
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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: 2022-10-24
- 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 (2021M693854); Guangxi Natural Science Foundation Program (2019GXNSFBA245030); Doctoral Foundation of Guangxi University of Science and Technology (18Z09)

摘要

摘要: 为研究多组合混杂纤维对再生混凝土(HFRAC)循环受压性能的影响规律，对84个试件进行单调受压试验和单调循环受压试验，分析了钢-碳纤维(SF-CF)、钢-玻璃纤维(SF-GF)、钢-聚丙烯纤维(SF-PF)和钢-聚乙烯醇纤维(SF-PVA) 4种纤维组合和纤维体积掺量对循环受压性能的影响。结果表明：与普通再生混凝土相比，HFRAC的破坏形态为延性破坏；各组HFRAC试件在循环受压下的应力-应变曲线包络线与单调受压应力-应变曲线近似一致；与钢纤维再生混凝土相比，SF-GF混杂纤维和SF-PVA混杂纤维对塑性应变累积的抑制效果更好；掺入弹性模量较大的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1.0vol%SF+0.5vol%CF时再生混凝土的刚度退化率增加了43.4%。最后，在试验结果的基础上，建立了HFRAC单轴循环受压应力-应变关系全曲线方程，计算结果与试验结果吻合良好。
- 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

SF—Steel fiber; PF—Polypropylene fiber; CF—Carbon fiber; PVA—Polyvinyl alcohol fiber; GF—Glass fiber

Figure 1. Appearance characteristics of fiber

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图 2 试验加载装置及加载制度

LVDT—Linear variable displacement transducer

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(σ)-应变(ε)全曲线

Figure 5. Typical cyclic compressive stress (σ)-strain (ε) 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(E_unl/E₀)与循环次数的关系曲线

Figure 7. Relationship curves between stiffness ratio (E_unl/E₀) and cycle number of HFRAC

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图 8 HFRAC的滞回耗散能量

Figure 8. Hysteretic energy consumption 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(RCA)的物理性能

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

Property	Apparent density/(kg·m^–3)	Bulk density/(kg·m^–3)	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. 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/%	Recycled coarse aggregate replacement rate/%	Material amount/(kg·m⁻³)
Strength grade	Water-binder ratio w/c	Sediment charge/%	Recycled coarse aggregate replacement rate/%	Cement	Water	Additional water	Sand	Coarse aggregate
C35	0.41	32	100	500	254.8	25.0	542	1153

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