Controlled Hardening of Silicate Binders for the Optimization of High Performance Composites

Bažantová, Zdeňka; Kolář, Karel; Konvalinka, Petr; Litoš, Jiří; Petrtyl, M.

doi:10.4028/www.scientific.net/kem.722.281

Cited by 7 publications

(8 citation statements)

References 12 publications

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“…The cementitious matrix used in the framework of this study is consisting of fine-grained aggregate with fraction up to 1 mm, cement, silica fume, glass powder, water, and high-range water-reducers, fully described in [15]- [17] ( Table 2). The components were mixed in a 750 kg mixer and transported into the lab in 12 kg bags as a dry prefabricated mixture.…”

Section: Production Of Samplesmentioning

confidence: 99%

Directed Orientation of Steel Fibres in Ultra-High-Performance Cementitious Composite Using the Magnetic Field

Lovichová

Takáčová

Künzel

et al. 2020

WIT Transactions on the Built Environment

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Ultra-high-performance fibre-reinforced cementitious composites are one of the key industries in the field of concrete technology. Thanks to their exceptional mechanical properties and significantly improved ductility, they are widely used for various special applications such as defensive and protective structures. In composite materials, it is desirable to place the reinforcement where it is needed and in the direction it is needed. In fibre-reinforced cementitious composites, this orientation is possible through a magnetic field. In the framework of this study, a prototype device for controlled fibre orientation in a cementitious composite was developed. Mixtures of both cementitious composite and ultrasound gel having similar rheological properties to the cementitious matrix were tested. It has been observed that is possible to control the orientation of the steel fibres and direct the fibres in the desired direction by employing an electromagnetic field.

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Section: Production Of Samplesmentioning

confidence: 99%

Directed Orientation of Steel Fibres in Ultra-High-Performance Cementitious Composite Using the Magnetic Field

Lovichová

Takáčová

Künzel

et al. 2020

WIT Transactions on the Built Environment

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“…Table 1 shows the basic components and their relative weight dosages. This type of concrete was used in many previous studies and is described in detail elsewhere [21,22] along with its patent [23].…”

Section: Ultra-high-performance Fibre-reinforced Cementitious Compositementioning

confidence: 99%

Experimental Investigation of Thin-Walled UHPFRCC Modular Barrier for Blast and Ballistic Protection

et al. 2020

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The static response of ballistic panels and also its resistance to blast and ballistic impact is investigated in the framework of this study. By connecting individual ballistic panels together, the protective barrier can be constructed. The protective barrier can be featured as a system with high mobility and versatility that is achieved by linking basic interlocking plate elements together. The resulting protective barrier can be shaped according to many possible scenarios in a wall with various possible opening angles and a small post with the tetragonal base or a larger post with the hexagonal ground plan. The material solution of the protective barrier benefits from the application of ultra-high-performance fibre-reinforced cement-based composites (UHPFRCC), which meets the requirements for enhanced resistance against extreme loads such as blast or impact. Besides, by using UHPFRCC, thin and slender design can be adopted, which is advantageous in many ways. Slender design results in a lower weight, allowing for easy manipulation and replacement. To verify the behavior of the panels, the proposed barrier was subjected to various loadings at different strain rates. The experimental campaign demonstrated that the protective barrier has a reasonable load-bearing capacity and also sufficient resistance against projectile impact and blast effects.

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“…Table 1 shows the basic components and their relative weight dosages. This type of concrete was used in many previous studies and is in detail described elsewhere (Bažantová et al, 2016a, 2016b) and its patent (Kolář et al, 2015).…”

Section: Technical Backgroundmentioning

confidence: 99%

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

Konrád

Sovják

2019

International Journal of Protective Structures

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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 ultrahigh-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-highperformance 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 fibrereinforced cementitious composites under localized impact loading and is worthy of further optimization.

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Controlled Hardening of Silicate Binders for the Optimization of High Performance Composites

Cited by 7 publications

References 12 publications

Directed Orientation of Steel Fibres in Ultra-High-Performance Cementitious Composite Using the Magnetic Field

Directed Orientation of Steel Fibres in Ultra-High-Performance Cementitious Composite Using the Magnetic Field

Experimental Investigation of Thin-Walled UHPFRCC Modular Barrier for Blast and Ballistic Protection

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

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