高强不锈钢绞线网增强工程水泥基复合材料弯曲性能试验

王新玲; 陈永杰; 钱文文; 李可; 朱俊涛

doi:10.13801/j.cnki.fhclxb.20200805.001

高强不锈钢绞线网增强工程水泥基复合材料弯曲性能试验

doi: 10.13801/j.cnki.fhclxb.20200805.001

1.
郑州大学　土木工程学院，郑州 450001
2.
成都基准方中建筑设计有限公司郑州分公司，郑州 450003

基金项目: 国家自然科学基金(51879243；U1804137；51708511)；河南省交通运输科技计划项目(2020J-2-7)

详细信息

通讯作者:
李可，博士，副教授，研究方向为新型复合材料性能及结构加固　 E-mail：irwinlike@163.com

中图分类号: TU528.58
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- 被引次数: 0
出版历程
- 收稿日期: 2020-05-21
- 录用日期: 2020-07-28
- 网络出版日期: 2020-08-05
- 刊出日期: 2021-04-08

Experiment on bending performance of engineered cementitious composites reinforced by high-strength stainless steel wire strand mesh

1.
School of Civil Engineering, Zhengzhou University, Zhengzhou 450001, China
2.
JZFZ Architectural Design CO. LTD., Zhengzhou Branch, Zhengzhou 450003, China

摘要

摘要: 为了研究高强不锈钢绞线网增强工程水泥基复合材料(Engineered cementitious composites，ECC)的受弯性能，考虑纵向高强不锈钢绞线配筋率、ECC抗压和抗拉强度等影响因素，对设计的8个高强不锈钢绞线网增强ECC试件进行四点弯曲试验。结果表明，随着纵向高强不锈钢绞线配筋率增大，其开裂荷载基本不变，峰值荷载明显增大，但峰值位移减小，即延性降低；纵向高强不锈钢绞线配筋率小于0.48%比较合理。随着ECC强度提高，高强不锈钢绞线网增强ECC受弯试件开裂和峰值荷载均增大。ECC开裂后，受拉区的钢绞线和ECC共同受拉，施加荷载达到峰值荷载的80%时，底部最大裂缝宽度仅0.08 mm；达到峰值荷载时，最大裂缝宽度不超过0.55 mm；受压区ECC的压应变达到0.01；ECC完全压碎时，跨中最大挠度达到跨度的1/15。说明本文研究的高强不锈钢绞线网增强ECC具有良好的抗裂性能和延性性能。
- 高强不锈钢绞线网增强ECC /
- 复合材料 /
- 受弯试验 /
- 试验研究 /
- 受弯性能
Abstract: In order to study the bending performance of engineered cementitious composites (ECC) reinforced by high-strength stainless steel wire strand meshes, the four-point bending tests were carried out on 8 high-strength stainless steel wire strands mesh reinforced ECC thin plate specimens designed in two groups, which considered two factors including the reinforcement ratio of longitudinal high-strength stainless steel wire strands and ECC compressive and tensile strength. The results show that with an increase in the reinforcement ratio of longitudinal high-strength stainless steel wire strands, the cracking load is basically unchanged, but the peak load increases significantly, and the peak displacement decreases, that is the ductility is reduced. In addition, the reasonable reinforcement ratio of longitudinal high-strength stainless steel wire strands should be less than 0.48%. The cracking load and peak load of the high-strength stainless steel wire strand mesh reinforced ECC bending specimen increases as the ECC strength increasing. After ECC cracking, the steel wire strands and the ECC in the tensile zone are tensioned together. When the applied load reaches 80% of the peak load, the maximum crack width at the bottom is only 0.08 mm. At peak load, the maximum crack width doesn’t exceed 0.55 mm, and the compressive strain of the ECC in the compression zone reaches 0.01. When the ECC is crushed, the maximum deflection in the mid-span reaches 1/15 of the span. These phenomena show that the high-strength stainless steel wire strand mesh reinforced ECC studied in the paper has good crack resistance and ductility.
- high-strength stainless steel stranded wire mesh reinforced ECC /
- composite material /
- bending test /
- experimental research /
- bending performance

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图 1 高强不锈钢绞线网增强ECC受弯试件

Figure 1. HSSSWS mesh reinforced ECC bending specimen

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图 2 试验加载装置

Figure 2. Schematic of test loading setup

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图 3 典型ECC受拉应力-应变曲线

Figure 3. Typical tensile stress-strain curve of ECC

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图 4 高强不锈钢绞线网增强ECC试件加载及破坏

Figure 4. Loading and failure mode of the high-strength stainless steel wire strand mesh reinforced ECC specimens

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图 5 高强不锈钢绞线网增强ECC荷载-跨中位移曲线

Figure 5. Load versus mid-span displacement curves of high-strength stainless steel wire strand mesh reinforced ECC

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图 6 高强不锈钢绞线网增强ECC试件挠度曲线

Figure 6. Deflection curves of high-strength stainless steel wire strand mesh reinforced ECC specimens

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图 7 高强不锈钢绞线网增强ECC荷载-ECC拉应变曲线

Figure 7. Load-tensile strain curves of high-strength stainless steel wire strand mesh reinforced ECC

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图 8 高强不锈钢绞线网增强ECC荷载-ECC压应变曲线

Figure 8. Load-compressive strain curves of high-strength stainless steel wire strand mesh reinforced ECC

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图 9 高强不锈钢绞线网增强ECC荷载-最大裂缝宽度曲线

Figure 9. Load versus maximum crack width curves of high-strength stainless steel wire strand mesh reinforced ECC

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图 10 高强不锈钢绞线网增强ECC荷载(强度)-纵向高强不锈钢绞线配筋率曲线

Figure 10. Load (strength) versus reinforcement ratio of longitudinal high-strength stainless steel wire strands curves of high-strength stainless steel wire strand mesh reinforced ECC

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图 11 高强不锈钢绞线网增强ECC纵向高强不锈钢绞线配筋率-抗弯与抗裂强度比值曲线

Figure 11. Reinforcement ratio of longitudinal high-strength stainless steel wire strands versus ratio of flexural strength and crack strength curves of high-strength stainless steel wire strand mesh reinforced ECC

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图 12 两种ECC抗压强度试件的荷载和强度柱状图

Figure 12. Histograms of load and strength for specimens with two kinds of compressive strengths

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表 1 高强不锈钢绞线网增强工程水泥基复合材料(ECC)受弯试件设计

Table 1. Design of the high-strength stainless steel wire strand (HSSSWS) mesh reinforced engineered cementitious composite (ECC) bending specimens

Group number	b/mm	l_d/mm	d/mm	n	ρ/%	Mix proportion of ECC
WC1	130	50	2.4	3	0. 26	Formula 1
WC2	110	40	2.4	3	0. 31	Formula 1
WC3	90	30	2.4	3	0. 37	Formula 1
WC4	70	20	2.4	3	0. 48	Formula 1
WD1	130	50	2.4	3	0. 26	Formula 2
WD2	110	40	2.4	3	0. 31	Formula 2
WD3	90	30	2.4	3	0. 37	Formula 2
WD4	70	20	2.4	3	0. 48	Formula 2
Notes: b—Specimen width; l_d—Spacing of the steel strand; d—Diameter of steel strand; n—Number of steel strands; ρ—Reinforcement ratio of longitudinal high-strength stainless steel wire strands.

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表 2 ECC配合比

Table 2. Mix proportions of ECC

Material	Formula 1/wt%	Formula 2/wt%
Cement	15.41	15.40
Sand	4.62	4.62
Fly ash	61.63	61.57
Silica powder	1.23	1.23
Water	15.41	15.40
PVA fiber	0.77	0.77
Water reducing agent	0.93	0.92
Thickening agent	0	0.09
Note: PVA—Polyvinyl alcohol.

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表 3 ECC受压试验结果

Table 3. Compression test results of ECC

Mix proportion of ECC	Average compressive strength/MPa	Ultimate compressive strain/%	Coefficient of variation
Formula 1	45.05	0.43	0.0469
Formula 2	37.02	0.43	0.0343

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表 4 ECC受拉试验结果

Table 4. Tensile test results of ECC

Mix proportion of ECC	Formula 1	Formula 2
Average cracking stress/MPa	2.45	2.39
Average cracking strain/%	0.0204	0.0189
Average tensile strength/MPa	4.23	3.46
Average ultimate strain/%	2.79	2.97

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表 5 高强不锈钢绞线网增强ECC弯曲试验结果

Table 5. High-strength stainless steel wire strand mesh reinforced ECC bending test results

Group number	ρ/%	Mix proportion of ECC	F_c/(N·mm⁻¹)	ε_tb/%	ε_ct/%	S_c/mm	F_u/(N·mm⁻¹)	W/mm
WC1	0.26	Formula 1	10.23	0.0342	0.0251	0.44	46.72	16.49
WC2	0.31	Formula 1	10.04	0.0324	0.0238	0.37	52.83	15.81
WC3	0.37	Formula 1	10.43	0.0393	0.0242	0.36	56.46	15.02
WC4	0.48	Formula 1	10.42	0.0326	0.0257	0.40	58.62	14.55
WD1	0.26	Formula 2	9.04	0.0213	0.0198	0.33	43.81	17.72
WD2	0.31	Formula 2	9.74	0.0254	0.0209	0.37	50.00	16.27
WD3	0.37	Formula 2	9.72	0.0214	0.0192	0.31	55.32	13.10
WD4	0.48	Formula 2	9.77	0.0237	0.0206	0.45	57.53	14.91
Notes: ρ—Reinforcement ratio of longitudinal high-strength stainless steel wire strands; F_c—Cracking load；ε_tb—Bottom tensile strain at cracking; ε_ct—Top compressive strain at cracking; S_c—Mid-span displacement corresponding to cracking load; F_u—Peak load; W—Mid-span deflection corresponding to peak load.

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