Abstract

 Steel fibres are used in high amounts in high-performance steel fibre reinforced cementitious composite (HPSFRCCs) and ultra-high-performance steel fibre reinforced cementitious composite (UHPSFRCCs) to enhance its structural performance. Due to the amount and randomly distribution of steel fibres in the cementitious matrix a level of damage in the aesthetic and mechanical response of fibres may be expected for structures under chloride exposition. This work aims to assess the structural behaviour of uncracked HPSFRCCs subjected to chlorides. Eight mixes of HPSFRCCs with different fibre content (40, 80, 120 and 160 kg/m3), with and without chlorides added to the mixes were designed. Prismatic specimens were cast and exposed to two curing conditions: initially in wet room and then in climatic room. The mechanical properties were obtained by means of the 3-point bending tests. The presence of corrosion in cross-section of the specimens were also analysed after mechanical tests by means of visual inspection. The results showed that the chloride added to the mixes has little influence on the post-cracking response of fibres.
Highlights
Steel fibre reinforced concrete (SFRC) is a composite with optimized post-crack behaviour provided by the addition of fibres in the brittle cementitious matrix
Several researchers have highlighted the improvement of mechanical behaviour in SFRC structural properties and applications (ALVAREZ, 2013; DI PRISCO, 2009; NAAMAN, 2004; RIZZUTI; BENCARDINO, 2014; THOMAS; RAMASWAMY, 2007)
Studies in SFRC subjected to chloride exposure have reported corrosion limited to steel fibres up to 5 mm from the surface
Summary
Steel fibre reinforced concrete (SFRC) is a composite with optimized post-crack behaviour provided by the addition of fibres in the brittle cementitious matrix. SFRC specimens subjected to a corrosive environment (immersed in a 3.5% NaCl solution) showed a slight loss of flexural strength and toughness according to Carrillo, Pulido and Aperador (2017). These works demonstrate that the effects of chlorides on the mechanical post-crack behaviour of fibres in HPSFRCs are still unclear. In this context, this work aims to assess the effects of corrosion on the mechanical response of uncracked HPSFRCCs specimens subjected to an accelerated chloride exposure. Results showed a small reduction on the post-crack behaviour of the composite the presence of oxidized fibres on the cross-section of the specimen, close to its surface
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