Dynamic Fragmentation of an Ultrahigh-Strength Concrete during Edge-On Impact Tests

Forquin, Pascal; Hild, François

doi:10.1061/(asce)0733-9399(2008)134:4(302)

Cited by 51 publications

(29 citation statements)

References 44 publications

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“…These dimensions allow obtaining the level of ultimate strength for an effective volume about one hundred cube millimetre. A similar value of effective volume was used to study the fragmentation process of an ultra high strength concrete submitted to edge on impact tests [32]. The h, w, L dimensions are well above the size of the small and medium sized ceramic particles but the particles of the M2L con crete are between 5 and 10 mm, rather close to the width of the specimens.…”

Section: Specimen Geometry and Experimental Set Upmentioning

confidence: 99%

Relationship between static bending and compressive behaviour of particle-reinforced cement composites

Árias

Forquin

Zaera

2008

Composites Part B: Engineering

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a b s t r a c tInnovative particle reinforced materials made of alumina particles and cement based matrix were designed, manufactured and tested to evaluate the potential use of ceramic aggregates in concretes.These particle reinforced composites were tested in three point bending and uniaxial compression con ditions to determine the influence of the shape and size of the ceramic inclusions, and the addition of sil ica fume on the mechanical properties. A specific methodology combining post mortem observations with a statistical analysis of tensile failure stresses (average strength and Weibull modulus) was con ducted to deduce the origin of failure for each cement based composite (porosity or ceramic particles/ matrix decohesion). A remarkable correlation is observed between bending failure stress level and the average strength measured under uniaxial compression loading. As main conclusion, addition of alumina particles in a mortar appears to strengthen or to weaken the composite depending on whether silica fume is used in the cementitious matrix.

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Section: Specimen Geometry and Experimental Set Upmentioning

confidence: 99%

Relationship between static bending and compressive behaviour of particle-reinforced cement composites

Árias

Forquin

Zaera

2008

Composites Part B: Engineering

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“…In conclusion, the damage patterns are likely the result from the loading stage and the failure mechanism is one of mode II multiple cracking with rubbing lips for which the kinetics remain unclear. In fact, a similar damage mechanism was seen during impact tests with axial confinement and during edge-on impact tests with an ultra-highperformance concrete [43,44].…”

Section: Post-mortem Study Of Quasi-oedometric Compression Testsmentioning

confidence: 71%

Relationship Between Mesostructure, Mechanical Behaviour and Damage of Cement Composites Under High-Pressure Confinement

2008

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This work seeks to determine how the mesostructure of seven types of cement composites containing alumina particles or not controls their deviatoric strength, compaction law, and damage under high-pressure of confinement. First, the method of analysis of quasioedometric compression tests is presented. Accuracy of the method for concrete is discussed by means of numerical simulations. The confined compression tests performed show the effects of adding ceramic aggregates. Furthermore, an application of post-mortem analysis by infiltration technique of each specimen is presented, revealing a highly micro-cracked pattern depending of the mesostructure of these materials. From these observations, a discussion is presented on the influence that the addition of ceramic aggregates exerts on the confined behaviour of these composites. The tests showed a highly beneficial effect of the presence of particles, on both the deviatoric strength and the compaction law of the concretes considered.

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“…The EOI technique has been widely used to investigate the damage modes produced by impact loadings of ceramic materials [12,46,47], ultra-high-strength concrete [48] and rocks [3,15,49]. An ultra-high-speed camera is used in the so-called open experimental configuration to observe the growth of damage at recording frequencies of approximately 1 Mfps (million frames per second).…”

Section: Experimental Techniques Devoted To Brittle Materialsmentioning

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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Dynamic Fragmentation of an Ultrahigh-Strength Concrete during Edge-On Impact Tests

Cited by 51 publications

References 44 publications

Relationship between static bending and compressive behaviour of particle-reinforced cement composites

Relationship between static bending and compressive behaviour of particle-reinforced cement composites

Relationship Between Mesostructure, Mechanical Behaviour and Damage of Cement Composites Under High-Pressure Confinement

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

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