Improving the mechanical performance of UHPFRC using fiber orientation: Experimental investigation, microstructural analysis, and numerical modeling - Details

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Abstract：

Ultra-High　Performance　Fiber　Reinforced　Concrete　(UHPFRC)　is　a　material　with　superior　mechanical　characteristics　which　are　attributed　to　the　use　of　a　high-volume　fraction　of　steel　fibers　and　an　ultra-high　strength　cementitious　matrix.　One　of　the　key　challenges　of　the　use　of　UHPFRC　is　its　increased　cost　and　the　scatter　of　the　mechanical　characteristics　which　are　both　attributed　to　the　addition　of　a　high-volume　fraction　of　steel　fibers.　A　suitable　fiber　orientation　method　could　have　significant　benefits　towards　the　improvement　of　the　mechanical　performance　of　UHPFRC.　This　paper　is　focused　on　a　systematic　study　of　the　effect　of　electromagnetic　field　and　chute　fiber　orientation　with　vibration　table　methods　on　the　tensile　strength　of　UHPFRC　with　various　steel　fiber　volume　fractions　(Vf:　1　%,　2　%,　and　3　%).　In　addition　to　the　mechanical　testing,　X-ray　CT　scan　image　analyses　were　conducted　to　quantitatively　evaluate　fiber　orientation.　The　2D　slices　produced　by　the　X-ray　CT　scan　image　analyses　clearly　show　the　effectiveness　of　the　steel　fiber　orientation　method　and　showed　potential　for　further　improvement.　The　results　of　this　research　show　that　the　application　of　suitable　orientation　methods　can　lead　to　significant　reduction　of　the　required　volume　fraction　of　steel　fibers　and　subsequent　cost　reduction,　as　the　results　of　UHPFRC　with　3　%　and　2　%　fibers　lead　to　similar　results　to　the　UHPFRC　with　2　%　and　1　%　oriented　steel　fibers　respectively.　Also,　a　numerical　tensile　constitutive　model　was　developed　for　UHPFRC　with　oriented　fibers,　based　on　the　experimental　results.　The　proposed　model　can　facilitate　the　extensive　use　of　UHPFRC　as　it　be　used　by　practitioners　for　the　analysis　and　design　of　UHPFRC　element/structures.　©　2025　Elsevier　Ltd

Keyword：

Constitutive model Fiber orientation Mechanical property Optimal design Steel fiber Ultra-High Performance Fiber Reinforced Concrete X-ray CT

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[ 1 ] [Xue J.]College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 2 ] [Xue J.]Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou, China
[ 3 ] [Xue J.]Joint International Research Laboratory of Deterioration and Control of Coastal and Marine Infrastructures and Materials, College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 4 ] [Mao S.]College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 5 ] [Cacciola P.]College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 6 ] [Cacciola P.]School of Architecture, Technology and Engineering, University of Brighton, Brighton, United Kingdom
[ 7 ] [Contento A.]College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 8 ] [Contento A.]Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou, China
[ 9 ] [Contento A.]Joint International Research Laboratory of Deterioration and Control of Coastal and Marine Infrastructures and Materials, College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 10 ] [Lampropoulos A.]Laboratory of Reinforced Concrete, School of Civil Engineering, National Technical University of Athens, Athens, Greece
[ 11 ] [Nicolaides D.]Department of Civil Engineering, Frederick University, Nicosia, Cyprus
[ 12 ] [Petrou M.F.]Department of Civil and Environmental Engineering, University of Cyprus, Nicosia, Cyprus
[ 13 ] [Yang Z.]College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 14 ] [Yang Z.]Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou, China
[ 15 ] [Yang Z.]Joint International Research Laboratory of Deterioration and Control of Coastal and Marine Infrastructures and Materials, College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 16 ] [Briseghella B.]College of Civil Engineering, Fuzhou University, Fuzhou, China
[ 17 ] [Briseghella B.]Fujian Provincial Key Laboratory on Multi-disasters Prevention and Mitigation in Civil Engineering, Fuzhou University, Fuzhou, China
[ 18 ] [Briseghella B.]Joint International Research Laboratory of Deterioration and Control of Coastal and Marine Infrastructures and Materials, College of Civil Engineering, Fuzhou University, Fuzhou, China

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Source ：

Construction and Building Materials

ISSN： 0950-0618

Year： 2025

Volume： 476

7 . 4 0 0

JCR@2023

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ESI Highly Cited Papers on the List： 0 Unfold All

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30 Days PV： 5

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