scholarly journals Surface corrosion in uncracked high performance steel fibre reinforced cementitious composites

2021 ◽  
Vol 4 (1) ◽  
pp. e28
Author(s):  
Mylene De Melo Vieira ◽  
Sergio H. P. Cavalaroc ◽  
Antonio Aguado
Keyword(s):  
High Performance ◽  
Visual Analysis ◽  
Steel Fibre ◽  
Classification Criteria ◽  
Cementitious Composites ◽  
Dense Matrix ◽  
Curing Conditions ◽  
Surface Corrosion ◽  
High Performance Steel ◽  
Over Time

High-performance steel fibre reinforced cementitious composites (HPSFRCCs) are usually produced with high contents of steel fibres. Therefore, more fibres are expected close to the surface. Despite the very dense matrix of these materials, the ingress of detrimental agents such as chlorides may occur. The objective of this work is to evaluate the mechanisms and effects of corrosion in HPSFRCCs specimens in terms of surface aspect. 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. Surface aspect was assessed by visual analysis with the use of a classification criteria. Results showed that the chloride added to the mixes induced a damage related to the superficial aspect whereas the specimens without chlorides presented no sign of corrosion over time.

scholarly journals Analysis of the influence of chlorides in the mechanical behaviour of high-performance steel fibre reinforced cementitious composites

2021 ◽  
Vol 4 (1) ◽  
pp. e29
Author(s):  
Mylene De Melo Vieira ◽  
Sergio Henrique P Cavalaro ◽  
Antonio Aguado
Keyword(s):  
High Performance ◽  
Mechanical Response ◽  
Steel Fibre ◽  
Mechanical Tests ◽  
Cementitious Composite ◽  
Structural Behaviour ◽  
Curing Conditions ◽  
Steel Fibres ◽  
High Performance Steel ◽  
The Aesthetic

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.

Numerical study of ultra-high-performance steel fibre–reinforced concrete columns under monotonic push loading

2017 ◽  
Vol 21 (8) ◽  
pp. 1234-1248 ◽  
Author(s):  
Shenchun Xu ◽  
Chengqing Wu ◽  
Zhongxian Liu ◽  
Jun Li
Keyword(s):  
Reinforced Concrete ◽  
Axial Compression ◽  
High Performance ◽  
Steel Fibre ◽  
Concrete Columns ◽  
Fibre Reinforced Concrete ◽  
Structural Behaviour ◽  
Reinforced Concrete Columns ◽  
Steel Fibre Reinforced Concrete ◽  
High Performance Steel

A finite element model is developed to investigate the behaviour of ultra-high-performance steel fibre–reinforced concrete columns under combined axial compression and horizontal monotonic push loading. The effects of steel fibre content, axial compression ratio, reinforcement ratio (or rebar ratio), stirrup ratio and shear span ratio on the structural behaviour of ultra-high-performance steel fibre–reinforced concrete columns are investigated in detail. The numerical model shows good agreement in bond–slip behaviour of specimens based on CEB model results and numerical results, and such behaviour should be taken into consideration in engineering practice. The results indicate that the developed finite element model could predict the structural behaviour and failure mode of ultra-high-performance steel fibre–reinforced concrete columns effectively. It is found that the reinforcement ratio, axial compression ratio, shear span ratio and volume fraction of steel fibre have a great influence on both the structural behaviour and failure modes of specimens.

scholarly journals USING TEXTILE ARAMID FABRICS TO INCREASE THE BALLISTIC RESISTANCE OF ULTRA-HIGH-PERFORMANCE STEEL-FIBRE REINFORCED CONCRETE

2020 ◽  
Vol 60 (6) ◽  
Author(s):  
Michal Mára ◽  
Radoslav Sovják ◽  
Jindřich Fornůsek
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Steel Fibre ◽  
Rear Side ◽  
Fibre Reinforced Concrete ◽  
Ballistic Performance ◽  
Steel Fibre Reinforced Concrete ◽  
Textile Fabrics ◽  
High Performance Steel ◽  
Aramid Fabrics

Thin plates made of Ultra-High-Performance Steel-Fibre-Reinforced Concrete (UHPSFRC) with textile Aramid fabrics were subjected to a projectile impact and its post-test damage was discussed. The damage degrees were the type of the response and crater surface, which was determined by using a 3D scanner. The most common type of ammunition, which is a 7.62 × 39mm calibre with a full-metal jacket and a mild-steel core, was used for all specimens. It was verified experimentally that the UHP-SFRC with textile Aramid fabrics has a better ballistic performance in comparison with its counterpart made of the UHP-SFRC without any textile reinforcement. Also, it was verified that specimens with the point or segment interconnection threads between the front side textile fabrics and rear side textile fabrics have a higher resistance due to the better integrity of the monolithic UHP-SFRC mixture.

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