scholarly journals RESPONSE OF HIGH-PERFORMANCE FIBRE REINFORCED CONCRETE REINFORCED BY TEXTILE REINFORCEMENT TO IMPACT LOADING

2016 ◽  
Vol 56 (4) ◽  
pp. 328-335 ◽  
Author(s):  
Filip Vogel ◽  
Ondřej Holčapek ◽  
Petr Konvalinka
Keyword(s):  
Impact Loading ◽  
High Performance ◽  
High Performance Concrete ◽  
Impact Force ◽  
Cement Composites ◽  
Fibre Reinforced Concrete ◽  
Impact Machine ◽  
Three Point Bending ◽  
The Impact ◽  
High Performance Fibre

Generally, cement composites like high-performance concrete (HPC) are very brittle. The resistance to the impact loading of the HPFRC and the HPFRC reinforced by the textile reinforcement are compared in this article. The samples (0.56 × 0.1 × 0.1 m) were experimentally tested in three-point bending, by using horizontal impact machine. The better resistance of the textile reinforced HPFRC is obvious from the collected data (impact force, acceleration of hammer and acceleration of the tested sample).

Behaviour of Different Types of Concrete under Impact and Quasi-Static Loading

2013 ◽  
Vol 486 ◽  
pp. 295-300 ◽  
Author(s):  
Petr Máca ◽  
Petr Konvalinka ◽  
Manfred Curbach
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Impact Loading ◽  
High Performance ◽  
High Performance Concrete ◽  
Fibre Reinforced Concrete ◽  
Static Conditions ◽  
Direct Tensile ◽  
Direct Tensile Strength ◽  
The Impact

This paper describes mixture formulation of Ultra High Performance Fibre Reinforced Concrete (UHPFRC) with 2% of fibres by volume and its response to quasi-static and dynamic impact loading. The UHPFRC mixture was prepared using locally available constituents and no special curing or mixing methods were used for its production. In addition, the mechanical parameters of three other types of concrete, i.e. normal strength concrete (NSC), fibre reinforced concrete (FRC) and high performance concrete (HPC) is compared. The main properties assessed throughout the experimental work are compressive, flexural and direct tensile strength as well as response of tested concretes to impact flexural loading. The impact loading is produced by a vertically falling weight of 24 kg from the height of 1 m on concrete prisms. The strain rate increase corresponds to low-velocity impacts such as vehicle crash or falling rocks. Compressive strength of UHPFRC exceeded 130 MPa and its direct tensile strength was 10.3 MPa. This type of concrete also exhibited strain hardening both in flexure under quasi-static conditions and during impact. Based on the comparison of impact reactions, it was concluded that the resistance of UHPFRC to impact loading is superior compared to the referent types of concretes (NSC, FRC, HPC).

Experimental procedure for determination of the energy dissipation capacity of ultra-high-performance fibre-reinforced concrete under localized impact loading

2019 ◽  
Vol 10 (2) ◽  
pp. 251-265 ◽  
Author(s):  
Petr Konrád ◽  
Radoslav Sovják
Keyword(s):  
Reinforced Concrete ◽  
Impact Loading ◽  
High Performance ◽  
Volume Fraction ◽  
Concrete Specimen ◽  
Basic Material ◽  
Fibre Reinforced Concrete ◽  
Significant Difference ◽  
The Impact ◽  
High Performance Fibre

Research presented in this article is aimed to investigate the ability of ultra-high-performance fibre-reinforced concrete to absorb and dissipate mechanical energy at elevated strain rate loading. Specimens made of ultra-high-performance fibre-reinforced concrete were subjected to the low-velocity impact using the new testing procedure where no fixed supports that hold the sample during the impact were applied. The fibre volume fraction of the ultra-high-performance fibre-reinforced concrete was set as the main test variable in the framework of this study and the volumetric fraction of fibres was ranging from 0.125% to 2%. A high-speed camera was used to measure velocities of the impactor and the ultra-high-performance fibre-reinforced concrete specimen before and after the impact. Consequently, the energy dissipated by the ultra-high-performance fibre-reinforced concrete specimen during the impact was calculated using a simple energy balance equation. To determine the basic material properties of ultra-high-performance fibre-reinforced concrete, quasi-static loading rate was applied and conventional methods were used. A significant difference between the values of dissipated energies for different loading rates and various fibre volumetric fractions was observed. It can be noted that the new procedure shows a reasonable approach for testing the fibre-reinforced cementitious composites under localized impact loading and is worthy of further optimization.

scholarly journals LABORATORY STUDY ON THE INFLUENCE OF CASTING ON PROPERTIES OF ULTRA-HIGH PERFORMANCE FIBRE REINFORCED CONCRETE (UHPFRC) SPECIMENS

2014 ◽  
Vol 20 (3) ◽  
pp. 380-379 ◽  
Author(s):  
Adam Zofka ◽  
Miglė Paliukaitė ◽  
Audrius Vaitkus ◽  
Dominika Maliszewska ◽  
Ramandeep Josen ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
High Performance ◽  
Fibre Orientation ◽  
Compact Tension ◽  
Fibre Reinforced Concrete ◽  
X Ray ◽  
Fracture Testing ◽  
Physical Changes ◽  
The Impact ◽  
High Performance Fibre

This paper presents a study on the effects of casting procedure and resulting fibre orientation on the properties of Ultra-High Performance Fibre Reinforced Concrete (UHPFRC). To investigate the impact of fibre orientation in the UHPFRC specimens, three approaches were employed. First, densities were measured from the top, middle and bottom zones of the cylinders to observe physical changes as the function of cylinder height. Secondly, two engineering fracture tests were performed in both compression and tension, and a comparison of fracture energies was conducted between different cylinder zones. While previous studies have explored the influence of steel fibres on the UHPFRC performance, the Semi-Circular Bending (SCB) and Disc Compact Tension (DCT) experimental setups have not yet been used in the UHPFRC fracture testing. Lastly, samples from different zones were scanned using X-ray computer tomography (X-ray CT). Both visual and digital image analysis of the X-ray scans were conducted in order to observe fibre orientation pattern changes within different zones. Although density calculations showed insignificant differences between different zones, fracture testing exhibited significant differences through the testing process as well as through fracture energy computations. Furthermore, X-ray CT demonstrated considerable differences in spatial fibre orientation with respect to two uniquely defined angles.

scholarly journals ULTRA-HIGH-PERFORMANCE FIBRE-REINFORCED CONCRETE UNDER HIGH-VELOCITY PROJECTILE IMPACT. PART I. EXPERIMENTS

2018 ◽  
Vol 58 (4) ◽  
pp. 232 ◽  
Author(s):  
Sebastjan Kravanja ◽  
Radoslav Sovják
Keyword(s):  
Significant Influence ◽  
Impact Loading ◽  
High Velocity ◽  
High Performance ◽  
Fibre Volume ◽  
Fibre Reinforced Concrete ◽  
Volumetric Fraction ◽  
Projectile Impact ◽  
High Performance Fibre ◽  
Area And Volume

A series of cratering experiments were performed where the response of the Ultra-High-Performance Fibre-Reinforced Concretes with various fibre volume fractions to the high- velocity projectile impact loading was investigated. It was found that the increment of the fibre volumetric fraction did not have a significant influence on the depth of the penetration, but it was very effective in reducing the crater area and volume.

scholarly journals Probabilistic fatigue analysis of ultra-high-performance fibre-reinforced concrete under thermal effects

2018 ◽  
Vol 165 ◽  
pp. 12001
Author(s):  
José D. Ríos ◽  
Héctor Cifuentes
Keyword(s):  
Reinforced Concrete ◽  
Thermal Effects ◽  
High Performance ◽  
High Performance Concrete ◽  
Fatigue Behaviour ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Ultra High Performance Concrete ◽  
Polypropylene Fibres ◽  
High Performance Fibre

This paper describes the influence of the temperature and the fibre reinforcement on the flexural fatigue behaviour of an ultra-high-performance fibre-reinforced concrete. Three-point bending fatigue tests were carried out for an ultra-high-performance concrete subjected to different temperatures ranging from room temperature up to 300 ºC and considering three different types of reinforcement: a) steel fibres, b) hybrid steel and polypropylene fibres and c) non-reinforced (reference matrix). The fatigue behaviour was assessed from the S-N fields obtained through a probabilistic fatigue model developed by Castillo and Fernández-Canteli. The influence of the type of reinforcement on the fatigue behaviour was analysed by SN curves. An analysis of the thermal effects in the fatigue life of the ultra-high-performance concrete has also been carried out. The results showed the most suitable fibre reinforcement among the analysed options to get the best fatigue behaviour in accordance to the exposure temperature.

scholarly journals Optimizing the Mechanical Properties of Ultra-High-Performance Fibre-Reinforced Concrete to Increase Its Resistance to Projectile Impact

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 5098
Author(s):  
Anna L. Mina ◽  
Konstantinos G. Trezos ◽  
Michael F. Petrou
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Fibre Reinforced Concrete ◽  
Direct Tension ◽  
Steel Fibres ◽  
Projectile Impact ◽  
Binder Ratio ◽  
High Performance Fibre

This study describes an extensive experimental investigation of various mechanical properties of Ultra-High-Performance Fibre-Reinforced Concrete (UHPFRC). The scope is to achieve high strength and ductile behaviour, hence providing optimal resistance to projectile impact. Eight different mixtures were produced and tested, three mixtures of Ultra-High-Performance Concrete (UHPC) and five mixtures of UHPFRC, by changing the amount and length of the steel fibres, the quantity of the superplasticizer, and the water to binder (w/b) ratio. Full stress–strain curves from compression, direct tension, and flexural tests were obtained from one batch of each mixture to examine the influence of the above parameters on the mechanical properties. The Poisson’s ratio and modulus of elasticity in compression and direct tension were measured. Additionally, a factor was determined to convert the cubic strength to cylindrical. Based on the test results, the mixture with high volume (6%) and a combination of two lengths of steel fibres (3% each), water to binder ratio of 0.16% and 6.1% of superplasticizer to binder ratio exhibited the highest strength and presented great deformability in the plastic region. A numerical simulation developed using ABAQUS was capable of capturing very well the experimental three-point bending response of the UHPFRC best-performed mixture.

scholarly journals TIMBER-CONCRETE COMPOSITE RIBBED SLABS WITH HIGH-PERFORMANCE FIBRE-CONCRETE

2021 ◽  
Vol 3 ◽  
pp. 40-44
Author(s):  
Karina Buka-Vaivade ◽  
Dmitrijs Serdjuks ◽  
Janis Sliseris ◽  
Andrejs Podkoritovs ◽  
Raimonds Ozolins
Keyword(s):  
Reinforced Concrete ◽  
Composite Structures ◽  
High Performance ◽  
High Performance Concrete ◽  
Numerical Models ◽  
Three Dimensional ◽  
Autogenous Shrinkage ◽  
Fibre Reinforced Concrete ◽  
Ordinary Concrete ◽  
High Performance Fibre

Composite of such renewable material as timber and the most popular man-made material as concrete offers many benefits. Such of them are high load-bearing capacity with low dead load and increased structural bending stiffness. Higher specific strength of high-performance concrete in comparison with ordinary concrete ensures more efficient use of the material. Addition of fibres can reduce the fragility and autogenous shrinkage cracks of high-performance concrete and makes it possible to design thinner layers of concrete for timber-concrete composite structures. Ribbed slabs as solution for the floor slabs, allows to reduce material consumption and to integrate engineering communications into the structures. The current study focuses on determining the effect of the use of high-performance fibre reinforced concrete for timber-concrete composite ribbed slabs with adhesive connection between layers, as the most effective connection type for composite action. The effect of the use of high-performance fibre reinforced concrete is determined by comparison of mid-span displacements of the ribbed slabs numerical models. Three-dimensional finite element models of timber and ordinary concrete composite ribbed slab and high-performance fibre reinforced concrete with additional longitudinal reinforcement ribbed slab are validated by experiment data. Developed numerical models makes it possible to predict the dependence of applied load on mid-span displacement in three-point bending with sufficient precision. Obtained results showed, that replacement of ordinary concrete layer by high-performance fibre reinforced concrete in timber-concrete composite ribbed slab with adhesive connection up to 1.68 times decrease vertical mid-span displacements.  

Hodder Avenue Underpass: An Innovative Bridge Solution with Ultra-High Performance Fibre-Reinforced Concrete

2014 ◽  
Vol 629-630 ◽  
pp. 37-42
Author(s):  
Yang Eileen Li ◽  
Liang Guo ◽  
Biljana Rajlic ◽  
Philip Murray
Keyword(s):  
Reinforced Concrete ◽  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Protective Layer ◽  
Complex Loading ◽  
Fibre Reinforced Concrete ◽  
Modular Construction ◽  
Box Girders ◽  
High Performance Fibre

The Hodder Avenue underpass – recipient of the Precast/Prestressed Concrete Institute (PCI)’s Harry H. Edwards Industry Advancement Award – is a new highway bridge near Thunder Bay, Canada that utilized a modular construction approach facilitated by the extensive use of ultra-high performance fibre-reinforced concrete (UHPFRC) to expedite construction, elevate aesthetic value and enhance quality and durability. Almost all structural components were precast in facilities and assembled on site using UHPFRC joints, which have compact geometries with less complexity, superior durability and strength. The precast elements include a unique UHPFRC pier cap and pier column shells, high performance concrete (HPC) box girders, sidewalks/parapet walls, abutment caps, ballast walls, slope paving panels and approach slabs. Aesthetically, the structure achieved a slender and open form with the use of shallow precast box girders and a unique pier cap visually and structurally integral with the superstructure. The cap beam was prestressed and precast fully with UHPFRC to overcome design challenges such as geometrical limitations and complex loading. The pier cap and girders were made composite using field-cast UHPFRC joints reinforced with stainless steel bars and threaded bolts. The pier columns also utilized a unique design with precast UHPFRC shells serving as an aesthetic stay-in-place form as well as a protective layer for the salt splashes during Thunder Bay’s harsh winter seasons.

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