粗骨料与钢纤维对超高性能混凝土单轴拉伸性能的影响<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.023.015

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Abstract In order to improve the uniaxial tensile property of ultra-high performance concrete (UHPC) with coarse aggregate, uniaxial tensile test and image analysis were employed to investigate the effects of dosage, maximum particle size of coarse aggregate on the tensile property of UHPC and steel fiber dispersion in the UHPC system, respectively. The experimental results showed that with the increase of dosage and particle size of coarse aggregate, the distribution coefficient and orientation coefficient of steel fiber in the UHPC systems were significantly decreased, resulting in the declines of tensile first cracking strength, post-cracking strength and energy absorption capacity of UHPC with coarse aggregate. Based on the matching relationship between maximum particle size of coarse aggregate and volume fraction and diameter of steel fiber (D_max=3d_f/(V_f)^0.5), the introduction of hybrid steel fibers can make full use of the hierarchical matching relationship between the multi-scale steel fibers and aggregates with different particle size distribution. The uniaxial tensile property of UHPC with coarse aggregate could be improved by the hybridization of straight steel fiber with 0.12 mm diameter, 10 mm length and 1.2% volume fraction and hooked-end steel fiber with 0.35 mm diameter, 20 mm length and 1.8% volume fraction when the volume fraction and maximum particle size of coarse aggregate were 10% and 10 mm, respectively. And the UHPC's tensile post-cracking strength and energy absorption capacity were 8.69 MPa and 11.10 J, respectively.

Key words： coarse aggregate maximum particle size steel fiber ultra-high performance concrete uniaxial tensile property

Published: 08 May 2018

CLC number:

TU528

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	Articles by authors
	ZHANG Lihui
	LIU Jiaping
	ZHOU Huaxin
	LIU Jianzhong
	ZHANG Qianqian
	HAN Fangyu

Cite this article:

ZHANG Lihui,LIU Jiaping,ZHOU Huaxin, et al. Effects of Coarse Aggregate and Steel Fiber on Uniaxial Tensile Property of Ultra-high Performance Concrete[J]. Materials Reports, 2017, 31(23): 109-114.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.015 OR http://www.mater-rep.com/EN/Y2017/V31/I23/109

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