首页|Comparative impact behaviours of ultra high performance concrete columns reinforced with polypropylene vs steel fibres

Comparative impact behaviours of ultra high performance concrete columns reinforced with polypropylene vs steel fibres

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Polypropylene(PP)fibres have primarily used to control shrinkage cracks or mitigate explosive spalling in concrete structures exposed to fire or subjected to impact/blast loads,with limited investigations on capacity improvement.This study unveils the possibility of using PP micro-fibres to improve the impact behaviour of fibre-reinforced ultra-high-performance concrete(FRUHPC)columns.Results show that the addition of fibres significantly improves the impact behaviour of FRUHPC columns by shifting the failure mechanism from brittle shear to favourable flexural failure.The addition of steel or PP fibres affected the impact responses differently.Steel fibres considerably increased the peak impact force(up to 18％)while PP micro-fibres slightly increased the peak(3％-4％).FRUHPC significantly reduced the maximum mid-height displacement by up to 30％(under 20° impact)and substantially improved the displacement recovery by up to 100％(under 20° impact).FRUHPC with steel fibres significantly improved the energy absorption while those with PP micro-fibres reduced the energy absorption,which is different from the effect of PP-macro fibre reported in the literature.The optimal fibre content for micro-PP fibres is 1％due to its minimal fibre usage and low peak and residual displacement.This study highlights the potential of FRUHPC as a promising material for impact-resistant structures by creating a more favourable flexural failure mechanism,enhancing ductility and toughness under impact loading,and advancing the un-derstanding of the role of fibres in structural performance.

Ultra high-performance concreteSteel fibrePolypropylene micro-fibreFibre volume fractionImpact loadingPendulum testsColumns

Thong M.Pham、Harrison Hyde、Maw K.Kaung、Yan Zhuge、Duong T.Tran、Des Vlietstra、Tung M.Tran

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UniSA,STEM,University of South Australia,Mawson Lakes,SA 5095,Australia

BG□E Pty Ltd,Wellington Street,Perth,WA,6000,Australia

Austral Construction Pty Ltd,St Georges Terrace,Perth,WA,6000,Australia

Centre for Infrastructural Monitoring and Protection(CIMP),Curtin University,Kent St,Bentley,WA 6102,Australia

Barchip Australia Pty Ltd,U 2 6 Qualtroughq Street,Woolloongabba,Queensland,4102,Australia

Sustainable Developments in Civil Engineering Research Group,Faculty of Civil Engineering,Ton Duc Thang University,Ho Chi Minh City,72915,Viet Nam

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Australian Research Council(ARC)

DP220100307

2024

10.1016/j.dt.2024.04.016

防务技术
中国兵工学会

防务技术

CSTPCD
影响因子：0.358
ISSN：2214-9147
年,卷(期)：2024.40(10)