超高性能钢纤维混凝土力学性能

杨松霖; 刁波

doi:10.19818/j.cnki.1671-1637.2011.02.002

超高性能钢纤维混凝土力学性能

doi: 10.19818/j.cnki.1671-1637.2011.02.002

杨松霖^1,,
刁波²

1.
中国建筑设计研究院，北京 100044
2.
北京航空航天大学交通科学与工程学院，北京 100191

基金项目:

国家自然科学基金项目 50978010

详细信息

作者简介:
杨松霖（1982-），内蒙古包头人，中国建筑设计研究院工程师，工学博士，从事建筑结构设计以及高性能混凝土材料研究

中图分类号: U414.18
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- 被引次数: 0
出版历程
- 收稿日期: 2010-11-27
- 刊出日期: 2011-04-25

Mechanical properties of ultra-high performance steel fiber reinforced concrete

YANG Song-lin^1
,,
DIAO Bo²

1.
China Architecture Design and Research Group, Beijing 100044, China
2.
School of Transportation Science and Engineering, Beihang University, Beijing 100191, China

More Information

Author Bio:
YANG Song-lin(1982-), male, engineer, PhD, +86-10-68302413, yangsl@cadg.cn

摘要

摘要: 用端部弯折型、端部扁平型和波浪型3种钢纤维分别配制抗压强度大于100 MPa的超高性能纤维混凝土, 纤维体积掺率分别为1.0%、2.0%、2.5%和3.0%。通过立方体抗压试验和梁抗弯试验, 研究钢纤维形状和体积掺率对超高性能纤维混凝土流动性、抗压强度、抗弯强度、断裂能和弯曲韧度的影响。试验结果表明: 纤维体积掺率为1.0%~2.5%时, 端部扁平型钢纤维超高性能混凝土的抗弯强度、断裂能和弯曲韧度最佳; 纤维体积掺率为3.0%时, 端部弯折型钢纤维超高性能混凝土的抗弯强度、断裂能和弯曲韧度最佳; 纤维体积掺率为2.0%时, 端部扁平型钢纤维超高性能混凝土的施工性能和力学性能最佳; 纤维体积掺率为1.0%~3.0%时, 波浪型钢纤维超高性能混凝土的抗压强度最高, 但抗弯强度和断裂能最低。
- 超高性能纤维混凝土 /
- 钢纤维 /
- 力学性能 /
- 抗压强度 /
- 抗弯强度 /
- 断裂能 /
- 弯曲韧度
Abstract: Ultra-high performance fiber reinforced concretes (UHPFRC) with compressive strength over 100 MPa were confected by using steel fibers, such as kink end type, flat end type and wavy type. Doped fiber volume ratios were 1.0%, 2.0%, 2.5% and 3.0% respectively. The influences of steel fiber shapes and doped volume ratios on the fluidity, compressive strength, flexural strength, fracture energy and bending toughness of UHPFRC were researched through cube compressive tests and beam flexural tests. Experiment result shows that when doped fiber volume ratios are from 1.0% to 2.5%, UHPFRC with flat end steel fiber has the best flexural strength, fracture energy and bending toughness. When doped fiber volume ratio is 3.0%, UHPFRC with kink end type steel fiber has the best flexural strength, fracture energy and bending thoughness. When doped fiber volume ratio is 2.0%, UHPFRC with flat end type steel fiber has the best construction performance and mechanical performances. When doped fiber volume ratios are from 1.0% to 3.0%, the compressive strength of UHPFRC with wavy type steel fiber is highest than the, but its flexural strength and fracture energy are lowest.
- ultra-high performance fiber reinforced concrete /
- steel fiber /
- mechanical performance /
- compressive strength /
- flexural strength /
- fracture energy /
- bending toughness

HTML全文

图 1 钢纤维尺寸

Figure 1. Steel fiber sizes

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图 2 测量装置

Figure 2. Test equipment

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图 3 抗压强度与体积掺率的关系

Figure 3. Relationship between compressive strengthes and doped volume ratios

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图 4 弯曲应力与挠度的关系

Figure 4. Relationship between bending stresses and deflections

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图 5 开裂截面

Figure 5. Cracked sections

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图 6 抗弯强度与体积掺率的关系

Figure 6. Relationship between flexural strengthes and doped volume ratios

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图 7 断裂能与体积掺率的关系

Figure 7. Relationship between fracture energies and doped volume ratios

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图 8 弯曲韧度

Figure 8. Bending toughnesses

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表 1 物理和力学性能

Table 1. Physical and mechanical performances

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表 2 骨粒直径和通过率

Table 2. Aggregate size and passing rates

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表 3 钢纤维力学性能

Table 3. Mechanical performances of steel fibers

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表 4 超高性能纤维混凝土配比

Table 4. UHPFRC proportion

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表 5 流动半径

Table 5. Fluid radii

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表 6 纤维混凝土密度

Table 6. Densities of fiber reinforced concrete kg·m^-3

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表 7 初裂应力和初裂挠度

Table 7. Initial crack stresses and initial deflections

混凝土种类	体积掺率/%	初裂应力/MPa	初裂挠度/mm
端部弯折型	1.0	8.94	0.089
	2.0	9.81	0.073
	2.5	9.93	0.077
	3.0	10.10	0.103
端部扁平型	1.0	8.61	0.062
	2.0	9.16	0.078
	2.5	9.43	0.077
	3.0	10.38	0.081
波浪型	1.0	7.03	0.086
	2.0	7.60	0.075
	2.5	9.02	0.089
	3.0	9.48	0.102

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参考文献(23)

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