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Open AccessArticle

Thin Slabs Made of High-Performance Steel Fibre-Reinforced Cementitious Composite: Mechanical Behaviour, Statistical Analysis and Microstructural Investigation

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Department of Materials Engineering, Federal Center for Technological Education of Minas Gerais, Belo Horizonte 30421–169, Brazil
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Department of Transports Engineering, Federal Center for Technological Education of Minas Gerais, Belo Horizonte 30421–169, Brazil
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Federal Institute for Education, Science and Technology of Minas Gerais, Ipatinga 35164-261, Brazil
*
Author to whom correspondence should be addressed.
Materials 2019, 12(20), 3297; https://doi.org/10.3390/ma12203297
Received: 25 September 2019 / Revised: 5 October 2019 / Accepted: 10 October 2019 / Published: 11 October 2019
(This article belongs to the Special Issue Advanced Fiber-Reinforced Concrete Composites)
The present study evaluated the mechanical behaviour of thin high-performance cementitious composite slabs reinforced with short steel fibres. For this purpose, slabs with 1%, 3% and 5% vol. of steel fibres were moulded using the slurry infiltration method. Fibres concentrated in the region subjected to traction during bending stresses. After curing for 28 days, all slabs underwent flexural testing. The slabs with 5% fibre showed significantly higher flexural strength, deflection and toughness compared to those of the control group without reinforcement. The dense fibre distribution, resulting from the production process, led to profiles with multiple random cracks in the region of failure of the slabs as the fibre content increased. The results of the statistical analysis showed the intensity of the correlation between the variables and revealed that the increase of the fibre content significantly influenced the parameters of mechanical behaviour (load, flexural strength, deflection, toughness and toughness factor). Images obtained by optical microscopy aided in understanding the fibre–matrix interface, showing the bonding surface between the constituents of the composite. View Full-Text
Keywords: high-performance fibre-reinforced cementitious composite (HPFRCC); flexural strength; toughness; fibre distribution; fibre–matrix interface high-performance fibre-reinforced cementitious composite (HPFRCC); flexural strength; toughness; fibre distribution; fibre–matrix interface
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Soares Junior, P.R.R.; Maciel, P.S.; Barreto, R.R.; Silva Neto, J.T.; Siqueira Corrêa, E.C.; Bezerra, A.C.S. Thin Slabs Made of High-Performance Steel Fibre-Reinforced Cementitious Composite: Mechanical Behaviour, Statistical Analysis and Microstructural Investigation. Materials 2019, 12, 3297.

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