含粗骨料超高性能混凝土力学性能研究及机理分析<sup>*</sup>

doi:10.11896/j.issn.1005-023X.2017.023.016

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Abstract In order to explore the mechanical properties of ultra-high performance concrete (UHPC) with coarse aggregate, the effects of coarse aggregate volume contents (0 kg/m³, 280 kg/m³, 400 kg/m³, 480 kg/m³, 560 kg/m³), fiber contents (2%, 2.5%) and fiber shape (flat type, hooked-end type) on compressive strength, elastic modulus and flexural strength of UHPC have been studied in the present work. Fiber orientation coefficient and effective length of fiber were introduced to explore microscopic mechanism for the influence of coarse aggregate content on flexural strength. The results demonstrated that coarse aggregate volume content affects little on the compressive strength (0.4%—4.5%); applies significant enhancement on the elastic modulus (maximum increment 7.8%); causes negative effect to flexural strength whose decrement will be fostered due to the declined orientation coefficient and effective length induced by coarse aggregate. Increasing fiber content or adding hooked-end fiber will benefit the flexural strength, in which hooked-end fiber reinforcement has greater effect in this experiment because of the substantial increment of fiber effective length.

Key words： coarse aggregate steel fiber ultra-high performance concrete mechanical properties orientation coefficient fiber effective length

Published: 08 May 2018

CLC number:

TU528.572

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	Articles by authors
	CHENG Jun
	LIU Jiaping
	LIU Jianzhong
	ZHANG Qianqian
	ZHANG Lihui
	LIN Wei
	HAN Fangyu

Cite this article:

CHENG Jun,LIU Jiaping,LIU Jianzhong, et al. An Experimental Study and a Mechanism Analysis on Mechanical Properties of Ultra-high Performance Concrete with Coarse Aggregate[J]. Materials Reports, 2017, 31(23): 115-119.

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http://www.mater-rep.com/EN/10.11896/j.issn.1005-023X.2017.023.016 OR http://www.mater-rep.com/EN/Y2017/V31/I23/115

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