Mechanical behaviour of strain hardening cement-based composites under impact loading

Mechtcherine, Viktor; Millon, Oliver; Butler, Marko; Thoma, Klaus

doi:10.1016/j.cemconcomp.2010.09.018

Cited by 139 publications

(43 citation statements)

References 7 publications

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“…Previous studies on the effectiveness of fracture energy for improving the spall resistance of cementitious composite materials subjected to contact explosions are very limited. However, in some studies on the impact resistance of cementitious composites under dynamic loading, the effects of fracture energy on scabbing resistance are observed (Leppänen 2006;Mechtcherine et al 2011;Zhang et al 2009;Habel and Gauvreau 2008;Mindess et al 1987). Improving the fracture energy of cementitious composites has a large effect on the reduction of scabbing failure, which especially has a significant influence on the reduction of the diameter compared to the depth of local damage.…”

Section: Diameter Depth and Superficial Damagementioning

confidence: 99%

Experimental Investigation on the Blast Resistance of Fiber-Reinforced Cementitious Composite Panels Subjected to Contact Explosions

Nam

Kim

2017

Int J Concr Struct Mater

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This study investigates the blast resistance of fiber-reinforced cementitious composite (FRCC) panels, with fiber volume fractions of 2%, subjected to contact explosions using an emulsion explosive. A number of FRCC panels with five different fiber mixtures (i.e., micro polyvinyl alcohol fiber, micro polyethylene fiber, macro hooked-end steel fiber, micro polyvinyl alcohol fiber with macro hooked-end steel fiber, and micro polyethylene fiber with macro hooked-end steel fiber) were fabricated and tested. In addition, the blast resistance of plain panels (i.e., non-fiber-reinforced high strength concrete, and non-fiberreinforced cementitious composites) were examined for comparison with those of the FRCC panels. The resistance of the panels to spall failure improved with the addition of micro synthetic fibers and/or macro hooked-end steel fibers as compared to those of the plain panels. The fracture energy of the FRCC panels was significantly higher than that of the plain panels, which reduced the local damage experienced by the FRCCs. The cracks on the back side of the micro synthetic fiber-reinforced panel due to contact explosions were greatly controlled compared to the macro hooked-end steel fiber-reinforced panel. However, the blast resistance of the macro hooked-end steel fiber-reinforced panel was improved by hybrid with micro synthetic fibers.

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Section: Diameter Depth and Superficial Damagementioning

confidence: 99%

Experimental Investigation on the Blast Resistance of Fiber-Reinforced Cementitious Composite Panels Subjected to Contact Explosions

Nam

Kim

2017

Int J Concr Struct Mater

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“…The deflection capacity of SHCC is, in general, very high, and can be of great importance when certain loading types such as e.g. impact loading [36] or cyclic loadings [37] such as earthquakes are concerned. It is therefore crucial that any modifications of the material do not compromise this capability.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Development of ductile cementitious composites incorporating microencapsulated phase change materials

Šavija

Luković

Kotteman

et al. 2017

Int J Adv Eng Sci Appl Math

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In the past two decades, much research has been devoted to overcoming the inherent brittleness of cementitious materials. To that end, several solutions have been proposed, mainly utilizing fibres. One of the most promising classes of materials is strain hardening cementitious composite (SHCC). It utilizes PVA fibres, and it is relatively costly compared to regular concrete, so it is commonly used only in surface layers. In this paper, a multi-functional ductile cementitious composite based on SHCC has been developed. It uses microencapsulated phase change materials (PCMs), capable of reducing temperature fluctuations in the material due to their high heat of fusion. It is shown that, although addition of microencapsulated PCMs are detrimental to compressive strength, they have very little effect on the flexural strength and deflection capacity. In the future work, mixtures with higher PCM contents will be developed in order to exploit their heat storage capability better. This material has potential to reduce temperature effects on concrete surfaces, while at the same time being extremely ductile.

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“…By means of this setup developed by Schuler et al [20], dynamic spall experiments at strain rates varying between 140 and 180 s −1 were conducted on notched and unnotched cylindrical specimens of strain hardening cement-based composites (SHCC) [22]. The SHCCs are characterized by very high binder and relatively high fiber volume contents in finely grained matrix composition (0.2 mm maximum aggregates size) with fly ash.…”

Section: Advances In the Experimental Techniquementioning

confidence: 99%

Advances in experimental assessment of dynamic tensile strength of concrete by the spalling technique

Brara¹

2015

EPJ Web of Conferences

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Abstract. An experimental method to test concrete in dynamic tension by spalling with a Hopkinson bar as loading and measuring tool was developed in 1999. The dynamic strength of concrete specimen and strain rate were indirectly derived from an accurate data processing of the signals measured on the Hopkinson bar surface. This method suggested by late Prof. Klepaczko, allowed for reaching the highest strain rate reported in literature for which an intriguing tensile strength increase was highlighted. This simple and efficient technique has been adopted by many researchers around the world. Some significant improvements in terms of definition and reproducibility of the incident loading pulse travelling along the bar and direct and/or contactless measurements on concrete specimens have been introduced. The very high rate sensitivity of concrete tensile strength was corroborated by the additional experimental data obtained with this experimental technique during the last fifteen years. IntroductionThe most important phenomenon highlighted by the experimentation on concrete dynamics undertaken during the last decades is the rate sensitivity of the material, which means that its mechanical properties -notably the tensile strength, the Young's modulus, the Poisson ratio, the critical strain -depend on the applied loading rate. The phenomenon of increase of tensile strength with the loading rate, observed in the early sixties of the last century has been recognized as the "rate effect", and is typically represented as a dynamic increase factor (DIF), i.e., the ratio of dynamic to quasi-static strength versus strain rates. Globally, the rate dependency of concrete tensile strength can be subdivided into two regimes; a regime starting from the quasi-static range of strain rates up to about 1.0 s −1 with moderate rate effects and a regime with extensive rate effects for higher strain rates for which a DIF increased from 2 to about 7 [1]. The highest strain rates were essentially obtained with techniques based on the spalling phenomenon. Spall is defined as the ejection of fragments of a material specimen from the opposite side from which the specimen was impacted and/or impulsively loaded.The earliest experiment at very high strain rate reported by the literature was conducted on large plain concrete specimens (51 mm diameter and 838 mm length) impacted at one end by a steel sphere. The signals were recorded by means of strain gauges cemented on concrete specimen surface. In these tests, DIFs of 2.5 and 6 for 2.0 s −1 and 23 s −1 were respectively highlighted [2].This considerable strength increase was also observed about two decades later for large concrete instrumented wall panels (4,57 m × 1,65 m), each which were mounted on the side of a rectangular box reaction structure, loaded a Corresponding author: ahmedbrara@hotmail.com by surface explosion of TNT charge [3]. Pullback velocity of the ejected fragments measured during the test by means of high speed photography (10 3 pictures/s) allowed estimating the spall stren...

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Mechanical behaviour of strain hardening cement-based composites under impact loading

Cited by 139 publications

References 7 publications

Experimental Investigation on the Blast Resistance of Fiber-Reinforced Cementitious Composite Panels Subjected to Contact Explosions

Experimental Investigation on the Blast Resistance of Fiber-Reinforced Cementitious Composite Panels Subjected to Contact Explosions

Development of ductile cementitious composites incorporating microencapsulated phase change materials

Advances in experimental assessment of dynamic tensile strength of concrete by the spalling technique

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