钢纤维形状对高性能混凝土性能的影响

薛国杰; 王传林; 张佳苗; 刘泽平; 张腾腾; 张宇轩

doi:10.13801/j.cnki.fhclxb.20210210.003

钢纤维形状对高性能混凝土性能的影响

doi: 10.13801/j.cnki.fhclxb.20210210.003

薛国杰^1,,
王传林^{1, 2, ,},
张佳苗^1,,
刘泽平^1,,
张腾腾^1,,
张宇轩^1,

1.
汕头大学　土木与环境工程系汕头 515063
2.
汕头大学　广东省结构安全与监测工程技术研究中心，汕头 515063

基金项目: 汕头大学科研启动经费(NFT17011)

详细信息

通讯作者:
王传林，博士，讲师，硕士生导师，研究方向为土木工程材料和结构加固　E-mail：clwang@stu.edu.cn

中图分类号: TB333
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- 被引次数: 0
出版历程
- 收稿日期: 2020-12-23
- 录用日期: 2021-01-25
- 网络出版日期: 2021-02-10
- 刊出日期: 2021-12-01

Influence of steel fiber shape on the performance of high-performance concrete

1.
Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, China
2.
Guangdong Engineering Center for Structure Safety and Health Monitoring, Shantou University, Shantou 515063, China

摘要

摘要: 试验研究了6种长径比较小且直径较粗的钢纤维(SF)(短直形、长直线形、圆弧形、闭合三角形、闭合矩形、闭合圆环形)对高性能混凝土性能的影响。通过改变SF体积分数从而改变其形成的环域个数和面积，探究二者对混凝土流动性、抗拉及抗折强度的影响，并通过研究破坏界面分析混凝土破坏形式和机制。结果表明：闭合区域个数及纤维的环域面积对混凝土流动起主要影响；闭合SF中圆环形SF对混凝土抗折及抗压强度的提升效果优于其他形状的闭合SF。短直形SF与圆环形SF混杂试验中，圆环形SF体积分数为1vol%、短直形SF体积分数为0.5vol%时，SF/混凝土抗压强度和抗折强度提升的综合效果最佳。
- 钢纤维/混凝土 /
- 混凝土强度 /
- 纤维形状 /
- 纤维体积分数 /
- 纤维混杂
Abstract: The influence of six kinds of steel fibers (SF) (short straight, long straight, half ring, triangular, rectangular, circular) with small length-diameter ratio on high-performance concrete was studied. The influence of SF on the fluidity, compressive strength and bending strength of concrete was discussed by changing the volume fraction of SF to change the number and area of the ring formed. The failure mode and mechanism of concrete were analyzed by studying the failure interface. The results show that: the number of closed SF and the area of fiber ring play a major role in the flow of concrete; the circular SF in the closed SF has the best effect on the bending and compressive strength of concrete than other closed SF. In the hybrid test of short straight SF and circular SF, when the volume fraction of circular SF is 1vol% and the volume fraction of short straight SF is 0.5vol%, the improvement on the compressive strength and bending strength of SF reinforced concrete is the best.
- steel fiber reinforced concrete /
- concrete strength /
- fiber shape /
- fiber volume fraction /
- fiber hybrid

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图 1 闭合钢纤维(SF)分析假设及对比

Figure 1. Analysis hypothesis and comparison of closed steel fiber (SF)

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图 2 长径比较小且直径较粗SF理论分析设想

Figure 2. Hypothesis of theoretical analysis of SF with smaller aspect ratio and larger diameter

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图 3 SF种类

Figure 3. Types of SF

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图 4 闭合SF/混凝土流动性

Figure 4. Fluidity of closed SF reinforced concrete

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图 5 非闭合SF/混凝土抗折强度

Figure 5. Bending strength of non-closed SF/concrete

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图 6 短直形SF/混凝土抗折破坏形态

Figure 6. Bending failure modes of short straight SF/concrete

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图 7 闭合SF/混凝土抗折强度

Figure 7. Bending strength of closed SF/concrete

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图 8 矩形SF/混凝土抗折断裂面形态

Figure 8. Fracture surface morphology of rectangular SF/concrete

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图 9 非闭合SF/混凝土抗压强度

Figure 9. Compressive strength of non-closed SF/concrete

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图 10 闭合SF/混凝土抗压强度

Figure 10. Compressive strength of closed SF/concrete

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图 11 闭合SF/混凝土抗压破坏断面

Figure 11. Section of compressive failure of closed SF/concrete

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图 12 环形SF保护下的混凝土碎块

Figure 12. Concrete fragments protected by circular SF

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图 13 闭合SF对短直SF端部的锚固

Figure 13. End of short straight SF being anchored by closed SF

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图 14 环形SF与短直SF混杂增强混凝土强度

Figure 14. Strength of hybrid concrete strengthened with circular SF and short straight SF

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图 15 三角形SF/混凝土断面微观形态

Figure 15. Microstructures of triangular SF/concrete section

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表 1 硅酸盐水泥P.O 42.5R的技术指标

Table 1. Technical indexes of Portland cement P.O 42.5R

Property	National standard	Measured value
Loss on ignition	≤5.00	3.06
Specific surface area	≥300	378
Initial setting time/min	≥45	186
Final setting time/min	≤600	230
3-day compressive strength/MPa	≥4.0	5.6
3-day bending strength/MPa	≥22.0	27.6
28-day compressive strength/MPa	≥6.5	6.4
28-day bending strength/MPa	≥42.5	45.1

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表 2 水泥、粉煤灰、硅灰组成成分

Table 2. Composition of cement, fly ash and silica fume wt%

Material	SiO₂	Al₂O₃	Fe₂O₃	CaO	MgO	K₂O	Na₂O
Cement	21.83	3.59	6.30	57.80	2.61	0.84	0.23
Fly ash	46.44	38.01	3.12	7.50	0.23	0.88	0.33
Silica fume	92.18	0.23	0.09	0.99	1.83	0.31	0.05

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表 3 高性能混凝土基准配合比

Table 3. Reference mix proportion of high-performance concrete

Cement/(kg·m⁻³)	Fly ash/(kg·m⁻³)	Silica fume/(kg·m⁻³)	River sand/(kg·m⁻³)	Water-binder ratio	Superplasticizer
700	140	210	1050	0.21	6%
Note: the calculated water content of water-binder ratio is the sum of water content of water reducer and the added water, and the cementitious materials is the total content of cement, silica fume and fly ash.

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表 4 SF参数

Table 4. Parameters of SF

SF	Length of single steel fiber/mm	Fiber diameter/ mm	Effective anchorage length/mm
Short straight	10	1.2	10
Long straight	15	1.2	15
Half ring	15	1.2	10
Circular	31.4	1.2	10
Triangular	30	1.2	10
Rectangular	40	1.2	10

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表 5 混凝土强度测试样本

Table 5. Concrete strength test samples

Group name	Shape of SF	SF volume fraction/vol%	Number of SF/piece	Ring area/mm²
Benchmark	—	0	0	0
1vol%SF(SS)/concrete	Short straight (SS)	1	680	0
1.5vol%SF(SS)/concrete	Short straight (SS)	1.5	1020	0
2vol%SF(SS)/concrete	Short straight (SS)	2	1360	0
1vol%SF(LS)/concrete	Long straight (LS)	1	455	0
1.5vol%SF(LS)/concrete	Long straight (LS)	1.5	680	0
2vol%SF(LS)/concrete	Long straight (LS)	2	910	0
1vol%SF(HR)/concrete	Half ring (HR)	1	455	0
1.5vol%SF(HR)/concrete	Half ring (HR)	1.5	680	0
2% SF(HR)/concrete	Half ring (HR)	2	910	0
0.5vol%SF(CR)/concrete	Circular (CR)	0.5	107	8400
1vol%SF(CR)/concrete	Circular (CR)	1	215	16878
1.5vol%SF(CR)/concrete	Circular (CR)	1.5	325	25513
2vol%SF(CR)/concrete	Circular (CR)	2	432	33912
0.5vol%SF(T)/concrete	Triangular (T)	0.5	115	4980
1vol%SF(T)/concrete	Triangular (T)	1	230	9959
1.5vol%SF(T)/concrete	Triangular (T)	1.5	345	14939
2vol%SF(T)/concrete	Triangular (T)	2	460	19918
0.5vol%SF(R)/concrete	Rectangular (R)	0.5	85	8500
1vol%SF(R)/concrete	Rectangular (R)	1	170	17000
1.5vol%SF(R)/concrete	Rectangular (R)	1.5	255	25500
2vol%SF(R)/concrete	Rectangular (R)	2	340	34000
1vol%SF(CR)/concrete+ 0.5vol%SF(SS)/concrete	Circular (CR)+ Short straight (SS)	1+0.5	215+340	—
0.5vol%SF(CR)/concrete+ 1vol%SF(SS)/concrete	Circular (CR)+ Short straight (SS)	0.5+1	105+170	—

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表 6 SF对混凝土流动性的影响

Table 6. Influence of SF on the fluidity of concrete

Sample	SF volume fraction/vol%	Number of SF	Ring area/mm²	Fluidity/mm
Benchmark	0	0	0	167
0.5vol%SF(T)/concrete	0.5	115	4980	170
1vol%SF(T)/concrete	1	230	9959	177
1.5vol%SF(T)/concrete	1.5	345	14939	169
2vol%SF(T)/concrete	2	460	19918	162
0.5vol%SF(R)/concrete	0.5	85	8500	169
1vol%SF(R)/concrete	1	170	17000	176
1.5vol%SF(R)/concrete	1.5	255	25500	164
2vol%SF(R)/concrete	2	340	34000	156
0.5vol%SF(CR)/concrete	0.5	107	8400	168
1vol%SF(CR)/concrete	1	215	16878	171
1.5vol%SF(CR)/concrete	1.5	325	25513	151
2vol%SF(CR)/concrete	2	432	33912	148

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