新拌超高性能纤维增强混凝土流动性能对其抗压强度的影响

杨简; 陈宝春; 吴香国; 苏家战; 黄卿维

doi:10.13801/j.cnki.fhclxb.20210115.005

新拌超高性能纤维增强混凝土流动性能对其抗压强度的影响

doi: 10.13801/j.cnki.fhclxb.20210115.005

杨简^{1, 2,},
陈宝春^{2, 3, ,},
吴香国^{2, 4,},
苏家战^{2, 3,},
黄卿维^{2, 3,}

1.
三峡大学　三峡库区地质灾害教育部重点实验室，宜昌 443002
2.
福州大学　土木工程学院，福州 350108
3.
桥梁技术创新与风险防治国际联合研究中心，福州 350108
4.
哈尔滨工业大学　土木工程学院，哈尔滨 150090

基金项目: 国家重点研发计划项目(2018YFC0705400)；国家自然基金面上项目(51878178)

详细信息

通讯作者:
陈宝春，博士，教授，博士生导师，研究方向为超高性能混凝土、钢管混凝土拱桥及无缝桥　E-mail: baochunchen@fzu.edu.cn

中图分类号: TU375
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出版历程
- 收稿日期: 2020-11-27
- 录用日期: 2021-01-04
- 网络出版日期: 2021-01-15
- 刊出日期: 2021-11-01

Influence of the fresh ultra-high performance fiber reinforced concrete flowability on its compressive strength

YANG Jian^{1, 2
,},
CHEN Baochun^{2, 3
, ,},
WU Xiangguo^{2, 4
,},
SU Jiazhan^{2, 3
,},
HUANG Qingwei^{2, 3
,}

1.
Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China
2.
College of Civil Engineering, Fuzhou University, Fuzhou 350108, China
3.
National Center for Joint International Research of Bridges Technology Innovation and Risk Mitigation, Fuzhou 350108, China
4.
College of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China

摘要

摘要: 钢纤维掺入能提高超高性能纤维增强混凝土(Ultra-high performance fiber reinforced concrete，UHPFRC)的抗压强度，但削弱新拌浆体的流动性能，降低了对抗压强度的增强效果，且影响UHPFRC的工作性能。为研究这种不利影响，以钢纤维体积分数和长径比为变量，进行了A、B两组试验。A组固定水胶比为0.18，不控制流动性能，主要研究钢纤维对流动性能和抗压强度的影响。试验结果表明，新拌UHPFRC流动性能随钢纤维的体积分数、长径比增加而下降；当钢纤维体积率超过一定值(2.00vol%)时，流动性能明显下降，抗压强度增强效果也相应下降。通过X-ray CT扫描发现钢纤维掺入减弱浆体的自密实能力，导致硬化后的基体内部孔隙尺寸增大和孔隙率增加，进而削弱抗压强度。综合考虑钢纤维掺入对抗压强度的正、负效应，提出了抗压强度的半经验预测公式。B组改变水胶比，控制扩展度为240 mm，对比A组研究流动性能控制后，钢纤维体积分数和长径比对抗压强度的影响规律。结果表明，钢纤维体积分数较大时，增大水胶比，保持一定流动性能，能有效提高纤维的增强效果；钢纤维体积分数较小时，在满足流动性能要求的前提下，减小水胶比，可以进一步提高抗压强度。在UHPFRC配合比设计时，应考虑钢纤维对流动性能的不利影响，以提高纤维的增强效应并保证其良好的工作性能。
- 超高性能纤维增强混凝土 /
- 流动性能 /
- 钢纤维 /
- X-ray CT扫描 /
- 抗压强度
Abstract: Steel fiber can reinforce the compressive strength of ultra-high performance fiber reinforced concrete (UHPFRC), but it will reduce the flowability of fresh UHPFRC, thus weaken this reinforcement effect and the work performance of UHPFRC. In order to study this adverse effect, two sets of tests A and B were carried out with steel fiber volume fraction and aspect ratio as variables. In the A series test, the fixed water-to-binder ratio was 0.18 and didn’t control the flowability. It mainly studied the effect of steel fiber on flowability and compressive strength. The test results show that the flowability of fresh UHPFRC decreases with the increase of the volume fraction or aspect ratio of steel fiber; when the volume fraction of steel fiber exceeds a certain value (2.00vol%), the expansion degree decreases significantly, and the corresponding compressive strength enhancement effect also decreases. The X-ray CT scan test finds that the incorporation of steel fiber weaken the self-compacting ability of the fresh slurry, increasing in the internal pore size and porosity of the hardened matrix, thereby weakening the compressive strength. Comprehensively considering the positive and negative effects of steel fiber incorporation into compressive strength, a semi-empirical prediction formula for compressive strength was proposed. In the B series test, the water-binder ratio was changed and the expansion degree was controlled to 240 mm. Through comparative analysis of the A series test results, the effect of the volume fraction and aspect ratio of the steel fiber on the compressive strength after the control of the flowability was studied. The results show that when the volume fraction of steel fiber is large, the water-binder ratio should be increased to ensure a certain flowability, which can effectively improve the reinforcement effect of the fiber; when the volume fraction of fiber is small, the water-binder ratio should be decreased on the premise of meeting the flowability requirements, which can further improve the compressive strength. In the design of the UHPFRC mix ratio, in order to improve the reinforcing effect of steel fiber and ensure that UHPFRC has good working performance, the adverse effect of incorporating steel fiber on the flowability of UHPFRC should be considered.
- ultra-high performance fiber reinforced concrete /
- flowability /
- steel fiber /
- X-ray CT scan /
- compressive strength

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图 1 钢纤维参数对UHPFRC流动性能的影响

Figure 1. Effect of steel fiber parameters on flowability of UHPFRC

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图 2 钢纤维参数对UHPFRC抗压强度的影响

Figure 2. Effect of steel fiber parameters on compressive strength of UHPFRC

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图 3 C(A) UHPFRC试件X-ray CT扫描结果

Figure 3. X-ray CT scanning results of C(A) UHPFRC specimen

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图 4 3.00%S0213/C(A) UHPFRC试件X-ray CT扫描结果

Figure 4. X-ray CT scanning results of 3.00%S0213/C(A) UHPFRC specimen

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图 5 B组UHPFRC流动性能

Figure 5. Flowability of group B UHPFRC

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图 6 A、B组UHPFRC抗压强度对比

Figure 6. Comparison of compressive strength between group A and group B UHPFRC

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表 1 钢纤维的命名及其基本信息

Table 1. Naming and basic information of steel fiber

Number	Diameter/mm	Length/mm	Aspect ratio	Tensile strength/MPa	Elastic modulus/GPa
S0220	0.2	20	100	2850	210
S0213	0.2	13	65	2850	210
S0313	0.3	13	43	2850	210
Notes: Sijkl—Steel fiber; ij—Diameter of fiber; kl—Length of the fiber.

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表 2 基体配合比

Table 2. Matrix mix Mass ratio

Binder		Aggregate				Superplasticizer
Cement	Silica fume	40-70 mesh (0.212-0.428 mm)	20-40 mesh (0.428-0.850 mm)	10-20 mesh (0.850-1.700 mm)	400 mesh (0.038 mm)	Superplasticizer
1.0	0.3	0.14	0.41	0.53	0.09	0.025

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表 3 A组和B组试验的钢纤维和水胶比方案

Table 3. Steel fiber and water-to-binder ratio schemes of group A and group B tests

Steel fiber volume fraction/vol%			Water-binder ratio of group A	Water-binder ratio of group B
S0313	S0213	S0220	Water-binder ratio of group A	Water-binder ratio of group B
0.00	0.00	0.00	0.18	0.16
0.25	0.25	0.25		0.17
0.50	0.50	0.50		0.17
1.00	1.00	1.00		0.18
1.50	1.50	1.50		0.19
2.00	2.00	2.00		0.19
2.50	2.50	2.50		0.20
3.00	3.00	3.00		0.21

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表 4 A组UHPFRC试件的试验结果

Table 4. Test results of group A UHPFRC specimens

Fiber volume fraction/vol%	Expansion degree/mm			Compressive strength/MPa
Fiber volume fraction/vol%	S0313/C(A)	S0213/C(A)	S0220/C(A)	S0313/C(A)	S0213/C(A)	S0220/C(A)
0.00	300	-	-	135.2	-	-
0.25	278	279	273	135.0	137.6	140.1
0.50	268	270	265	137.4	138.3	145.3
1.00	250	245	243	139.7	145.0	157.8
1.50	241	238	235	149.2	152.8	165.2
2.00	239	235	233	157.3	162.6	174.3
2.50	230	227	225	156.0	164.5	177.8
3.00	219	210	202	158.1	168.7	182.2

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表 5 B组UHPFRC试件的试验结果

Table 5. Test results of group B UHPFRC specimen

Steel fiber volume fraction/vol%	Water-binder ratio	Expansion degree/mm			Compressive strength/MPa
Steel fiber volume fraction/vol%	Water-binder ratio	S0313/C(B)	S0213/C(B)	S0220/C(B)	S0313/C(B)	S0213/C(B)	S0220/C(B)
0.00	0.16	241	-	-	143.5	-	-
0.25	0.17	244	246	243	142.0	143.0	145.1
0.50	0.17	239	238	236	142.6	146.6	149.3
1.00	0.18	241	240	246	140.3	144.2	155.7
1.50	0.19	240	237	239	147.9	151.3	161.8
2.00	0.19	238	235	236	153.8	156.6	168.0
2.50	0.20	236	241	237	161.4	167.7	180.5
3.00	0.21	246	241	240	164.2	173.1	188.2

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