钢纤维-橡胶/混凝土抗剪性能试验

赵秋红; 董硕; 朱涵

doi:10.13801/j.cnki.fhclxb.20200507.005

钢纤维-橡胶/混凝土抗剪性能试验

doi: 10.13801/j.cnki.fhclxb.20200507.005

赵秋红^{1, 2, ,},
董硕^1,,
朱涵^{1, 2,}

1.
天津大学　建筑工程学院，天津 300072
2.
天津大学　滨海土木工程结构与安全教育部重点实验室，天津 300350

基金项目: 国家自然科学基金 (51678406；51878447)；天津市研究生科研创新项目(2019YJSB162)

详细信息

通讯作者:
赵秋红，博士，教授，博士生导师，研究方向为高层抗震、桥梁抗震、高性能结构及材料　 E-mail：qzhao@tju.edu.cn

中图分类号: TB332
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出版历程
- 收稿日期: 2020-02-22
- 录用日期: 2020-04-15
- 网络出版日期: 2020-05-07
- 刊出日期: 2020-12-15

Experimental study on shear behavior of steel fiber-rubber/concrete

ZHAO Qiuhong^{1, 2
, ,},
DONG Shuo^1
,,
ZHU Han^{1, 2
,}

1.
School of Civil Engineering, Tianjin University, Tianjin 300072, China
2.
Key Laboratory of Coastal CivilStructure and Safety of China Ministry of Education, Tianjin University, Tianjin 300350, China

摘要

摘要: 抗剪强度和剪切韧性是反映构件在复合受力状态下承载能力及耗能能力的重要指标。为研究钢纤维(SF)-橡胶/混凝土的剪切性能，设计了14组SF-橡胶/混凝土试件，通过双面剪切试验，研究了SF体积分数掺量、橡胶掺量和水胶比对SF-橡胶/混凝土试件的抗剪性能及剪切破坏形态的影响。研究表明：SF的桥联作用及其与橡胶颗粒的协同作用可显著改善混凝土的抗剪性能。SF对SF-橡胶/混凝土试件的抗剪性能起主导作用，SF-橡胶/混凝土试件的抗剪强度、峰值变形及剪切韧性相比普通混凝土及橡胶/混凝土试件均显著提高，且增幅随SF掺量的增加而增大，剪切破坏呈现出明显的延性特征。当SF体积分数为1.5vol%时，橡胶掺量(等体积取代砂取代率)为10%的SF-橡胶/混凝土试件的抗剪强度、峰值变形相比橡胶/混凝土分别提高了78%、63%。橡胶对SF-橡胶/混凝土试件的抗剪性能也起到辅助作用，SF-橡胶/混凝土试件的剪切韧性及延性相比SF/混凝土试件进一步增加。采用水胶比优化设计后，随着橡胶掺量的增加，SF-橡胶/混凝土的抗剪强度、峰值变形及峰值前剪切韧性可基本保持不变，而峰值后韧性指标进一步增加，增幅可高达96%。根据试验结果，考虑橡胶及SF掺量的影响提出了SF-橡胶/混凝土的抗剪强度计算式。
- 钢纤维-橡胶/混凝土 /
- 双面剪切试验 /
- 钢纤维掺量 /
- 橡胶掺量 /
- 抗剪强度 /
- 剪切韧性
Abstract: Shear strength and toughness are important indices for evaluating load-resisting capacity and energy absorption of members under complex loading conditions. In order to study the shear-resisting capacity of high-strength steel fiber(SF)-rubber/concrete, 14 sets of SF-rubber/concrete specimens were designed for double-shear experiments, in which influence of parameters including SF volume fraction, rubber volume substation and water to binder ratio on the shear-resisting behavior and failure modes of SF-rubber/concrete were investigated. Research results show that the bridging action of SF and its positive synergy with rubber particles in SF-rubber/concrete can significantly improve the shear-resisting behavior of concrete. SF play a dominant role in shear-resisting behavior of SF-rubber/concrete specimens. The shear strength, deformation at peak load and shear toughness of SF-rubber/concrete specimens are significantly higher than the plain concrete and rubberized concrete specimens, which increase with the SF volume fraction, and the shear failure mode of SF-rubber/concrete is obviously ductile. When the SF volume fraction is 1.5vol% and the rubber content (volume substitution of sand) is 10%, the shear strength and deformation at peak load of SF-rubber/concrete specimens are 78% and 63% respectively, higher than those of the rubber concrete. Rubber particles also help to improve the shear-resisting behavior of SF-rubber/concrete. The shear toughness and ductility of SF-rubber/concrete are further increased compared with SF reinforced concrete. With the increase of rubber content, the shear strength, peak deformation and pre-peak shear toughness of SF-rubber/concrete can be unchanged after using the optimized water-binder ratio, while the post-peak toughness index can be further increased by 96%. Based on the test results, shear strength formula of SF-rubber/concrete was established considering the influence of SF volume fraction and rubber substitution.
- steel fiber-rubber/concrete /
- double shear test /
- steel fiber volume fraction /
- rubber particles volume substation /
- shear-resisting capacity /
- shear toughness

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图 1 双面剪切试验装置示意图

Figure 1. Schematic diagram of double-shear test device

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图 2 双面剪切装置

Figure 2. Double-shear test set-up

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图 3 不同成分配比的钢纤维(SF)-橡胶/混凝土试件的受剪破坏形态

Figure 3. Shear failure modes of steel fiber (SF)-rubber/concrete specimens with different mix ratios

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图 4 SF-橡胶/混凝土试件剪切荷载-变形曲线

Figure 4. Shear load-deformation curves of each group of SF-rubber/concrete specimens

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图 5 SF掺量对SF-橡胶/混凝土试件剪切强度与峰值变形的影响

Figure 5. Shear strength and peak deformation of SF-rubber/concrete specimens influenced by volume fraction of SF

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图 6 橡胶掺量对SF-橡胶/混凝土试件剪切强度与峰值变形的影响

Figure 6. Shear strength and peak deformation of SF-rubber/concrete specimens influenced by volume substation of rubber

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图 7 优化水胶比后橡胶掺量对SF-橡胶/混凝土试件剪切强度与峰值变形的影响

Figure 7. Shear strength and peak deformation of SF-rubber/concrete specimen influenced by volume substation of rubber after mix optimization of water-binder ratio

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图 8 初始能量密度的定义

Figure 8. Definition of initial energy density

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图 9 剪切韧性计算参数

Figure 9. Definitions for shear toughness indexes

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图 10 SF掺量对SF-橡胶/混凝土试件剪切韧性指标的影响

Figure 10. Effects of volume fraction of SF on shear toughness index of SF-rubber/concrete specimens

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图 11 橡胶掺量对SF-橡胶/混凝土试件剪切韧性指标的影响

Figure 11. Effects of volume substation of rubber on shear toughness index of SF-rubber/concrete specimens

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图 12 优化水胶比后橡胶掺量对SF-橡胶/混凝土试件剪切韧性指标的影响

Figure 12. Effects of volume substation of rubber on shear toughness index of SF-rubber/concrete specimens after mix optimization of water-binder ratio

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图 13 SF-橡胶/混凝土试件抗剪强度试验值与拟合值比较

Figure 13. Comparison of shear strength of SF-rubber/concrete specimens between experimental and predicted results

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表 1 试验混凝土配合比

Table 1. Mix proportion of test concrete

Type	Specimen	Water-binder mass ratio	Volume fraction of steel fiber ${V_{\rm{f}}}$/%	Volume substitution of rubber particles ${\rho _{\rm{r}}}$/%	Water/ kg	Cement/ kg	Fine aggre- gate/kg	Coarse aggre- gate/kg	Mass fraction of super plasticizer/%
PC	R-0-F-0.0	0.340	0.0	0	160	470	820	960	1
Rubber/ concrete	R-10-F-0.0	0.340	0.0	10	160	470	738	960	1
	R-10-F-0.0-OP	0.285	0.0	10	155	544	738	960	1
	R-20-F-0.0	0.340	0.0	20	160	470	656	960	1
	R-20-F-0.0-OP	0.245	0.0	20	145	593	656	960	1
SF/ concrete	R-0-F-0.5	0.340	0.5	0	160	470	820	960	1
	R-0-F-1.0	0.340	1.0	0	160	470	820	960	1
	R-0-F-1.5	0.340	1.5	0	160	470	820	960	1
SF-rubber/ concrete	R-10-F-0.5	0.340	0.5	10	160	470	738	960	1
	R-10-F-1.0	0.340	1.0	10	160	470	738	960	1
	R-10-F-1.0-OP	0.285	1.0	10	155	544	738	960	1
	R-10-F-1.5	0.340	1.5	10	160	470	738	960	1
	R-20-F-1.0	0.340	1.0	20	160	470	656	960	1
	R-20-F-1.0-OP	0.245	1.0	20	145	593	656	960	1
Notes: PC—Plain concrete; In specimen denotation section, R—Rubber particles; R-0, R-10 and R-20—Rubber volume substitution ratios of 0%, 10% and 20%, respectively; F—Steel fiber, F-0.0, F-0.5, F-1.0, F-1.5—Steel fiber volume fraction ratios of 0vol%, 0.5vol%, 1.0vol% and 1.5vol%, respectively; OP—Optimized water-binder ratio.

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表 2 SF-橡胶/混凝土试件抗剪强度和峰值剪切变形试验结果

Table 2. SF-rubber/concrete specimens test results of shear strength and deformation at peak load

Specimen type	Specimen	${f_{{\rm{cu}}}}$/MPa	${f_{\rm{v}}}$/MPa	${F_{\max }}$/kN	${\varDelta _{\rm{p} } }$/mm
PC	R-0-F-0.0	68.70	8.03	160.67	0.702
Rubber/concrete	R-10-F-0.0	58.47	6.76	135.28	0.599
	R-10-F-0.0-OP	68.23	8.00	160.00	0.737
	R-20-F-0.0	46.50	5.53	110.69	0.529
	R-20-F-0.0-OP	65.65	8.20	163.92	0.729
SF/concrete	R-0-F-0.5	72.08	9.53	190.64	0.867
	R-0-F-1.0	74.71	10.59	211.84	0.901
	R-0-F-1.5	78.90	12.35	246.92	1.000
SF-rubber/concrete	R-10-F-0.5	60.23	9.29	185.74	0.834
	R-10-F-1.0	61.43	9.94	198.87	0.876
	R-10-F-1.0-OP	74.72	10.80	216.00	0.914
	R-10-F-1.5	65.72	12.03	240.67	0.978
	R-20-F-1.0	48.93	9.07	181.39	0.909
	R-20-F-1.0-OP	70.56	10.27	205.36	0.882
Notes: ${f_{{\rm{cu}}}}$—Cube compressive strength; f_v—Shear strength; F_max—Maximum shear load; ${\varDelta _{\rm{p}}}$—Deformation at peak load.

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表 3 SF-橡胶/混凝土试件剪切荷载-变形曲线峰值前及峰值后的韧性指标

Table 3. Toughness index evaluation pre-peak and post-peak load of shear load-deformation curves of SF-rubber/concrete specimens

Type	Specimen	${f_{{\rm{eq}}}}$/MPa	${\gamma _{\rm{p}}}$/%	${T_{\rm{p}}}$/ (10⁴J·m⁻³)	${f_{ {\rm{p} },{{k} } } }$/MPa			${R_{ {\rm{p} },{{k} } } }$/%
Type	Specimen	${f_{{\rm{eq}}}}$/MPa	${\gamma _{\rm{p}}}$/%	${T_{\rm{p}}}$/ (10⁴J·m⁻³)	${f_{{\rm{p}},1.2}}$	${f_{{\rm{p}},1.5}}$	${f_{{\rm{p}},2.0}}$	${R_{{\rm{p}},1.2}}$	${R_{{\rm{p}},1.5}}$	${R_{{\rm{p}},2.0}}$
PC	R-0-F-0.0	3.66	0.70	2.57	−	−	−	−	−	−
Rubber/concrete	R-10-F-0.0	2.99	0.60	1.80	−	−	−	−	−	−
	R-10-F-0.0-OP	3.79	0.74	2.80	−	−	−	−	−	−
	R-20-F-0.0	2.41	0.53	1.28	−	−	−	−	−	−
	R-20-F-0.0-OP	3.60	0.73	2.62	−	−	−	−	−	−
SF/concrete	R-0-F-0.5	3.73	0.87	3.23	0.44	−	−	4.64	−	−
	R-0-F-1.0	5.04	0.90	4.54	1.18	0.70	0.07	11.15	6.64	0.66
	R-0-F-1.5	5.94	1.00	5.95	1.32	0.60	0.43	10.72	4.82	3.46
SF-rubber/concrete	R-10-F-0.5	4.58	0.84	3.85	0.61	0.26	0.03	6.66	2.78	0.35
	R-10-F-1.0	4.96	0.88	4.35	1.50	0.87	0.65	15.09	8.79	6.50
	R-10-F-1.0-OP	5.23	0.91	4.78	1.63	0.91	0.68	15.06	8.46	6.26
	R-10-F-1.5	5.65	0.98	5.52	1.39	1.05	0.60	11.54	8.73	4.94
	R-20-F-1.0	4.68	0.91	4.26	1.35	1.13	0.79	14.93	12.47	8.70
	R-20-F-1.0-OP	4.78	0.82	3.93	1.59	1.37	0.74	15.51	13.36	7.23
Notes: ${f_{{\rm{eq}}}}$—Initial equivalent shear strength; ${f_{ {\rm{p} },{{k} } } }$—Equivalent residual shear strength; ${R_{ {\rm{p} },{{k} } } }$—Residual shear toughness ratio.

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