High-performance concrete engineered for protective barriers

Dancygier, Avraham N.

doi:10.1098/rsta.2016.0180

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Pham et al, 2018). Moreover, this positive effect is most pronounced for steel fibers (Dancygier, 2016; Dancygier et al, 2007), and it is valid also under low impact loads (Dancygier et al, 2012; Fujikake, 2014).…”

Section: Introductionmentioning

confidence: 66%

Effect of cracking localization on the structural ductility of normal strength and high strength reinforced concrete beams with steel fibers

Dancygier

Karinski²

2019

International Journal of Protective Structures

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This article presents a study of cracking localization in normal and high strength concrete beams that include steel fibers and the influence of this localization on their structural ductility. It is shown that for a given fiber type and content, as the reinforcement ratio ρ decreases, the cracking localization level increases. The effect of ρ on the level of cracking localization is more pronounced for low amounts of conventional reinforcement. This range of conventional reinforcement ratio is typical of slabs and especially for the commonly thicker protective slabs. Examination of the effect of the reinforcement ratio on the flexural ductility shows that there exists a transition point below which the ductility ratio decreases with ρ. This transition point is well above the minimum reinforcement ratio, which is required in design codes for plain reinforced concrete elements. Empirical analysis of the relation between cracking localization and ductility ratio shows that up to the same transition point, as cracking localization increases, the flexural ductility decreases. Findings of this study show that the positive effect of adding fibers on enhancing the impact resistance of slabs and beams is conflicted by their negative influence on reducing the structural ductility for low reinforcement ratios, which are typical of protective slabs.

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Section: Introductionmentioning

confidence: 66%

Effect of cracking localization on the structural ductility of normal strength and high strength reinforced concrete beams with steel fibers

Dancygier

Karinski²

2019

International Journal of Protective Structures

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“…In such cases, concrete is subjected to very high confinement stresses and/or dynamic tensile loadings [19] leading to critical damage modes such as pore collapse, shear fracturing, spalling and scabbing and multiple-fragmentation effects [5,20]. A better understanding of the role of free water in the concrete [21] and concrete composition, aggregate size or fibre content constitutes an important goal in view of improving the performance of protective barriers subjected to impact loadings [22,23].…”

Section: Brittle Materials: Materials Widely Exposed To Dynamic Loadingsmentioning

confidence: 99%

Brittle materials at high-loading rates: an open area of research

Forquin¹

2017

Phil. Trans. R. Soc. A.

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Brittle materials are extensively used in many civil and military applications involving high-strain-rate loadings such as: blasting or percussive drilling of rocks, ballistic impact against ceramic armour or transparent windshields, plastic explosives used to damage or destroy concrete structures, soft or hard impacts against concrete structures and so on. With all of these applications, brittle materials are subjected to intense loadings characterized by medium to extremely high strain rates (few tens to several tens of thousands per second) leading to extreme and/or specific damage modes such as multiple fragmentation, dynamic cracking, pore collapse, shearing, mode II fracturing and/or microplasticity mechanisms in the material. Additionally, brittle materials exhibit complex features such as a strong strain-rate sensitivity and confining pressure sensitivity that justify expending greater research efforts to understand these complex features. Currently, the most popular dynamic testing techniques used for this are based on the use of split Hopkinson pressure bar methodologies and/or plate-impact testing methods. However, these methods do have some critical limitations and drawbacks when used to investigate the behaviour of brittle materials at high loading rates. The present theme issue of Philosophical Transactions A provides an overview of the latest experimental methods and numerical tools that are currently being developed to investigate the behaviour of brittle materials at high loading rates. This article is part of the themed issue ‘Experimental testing and modelling of brittle materials at high strain rates’.

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