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Compressive behaviour of high performance concrete at dynamic strain-rates
High-strength cementitious materials have been developed based on the Densified Systems with ultrafine Particles (DSP) technology. DSP binders are produced from Portland cement, microsilica, and superplasticizers. However, even these concrete types show a rather low performance when subjected to tensile stresses, and in order to increase fracture toughness and reduce brittleness, steel fibers are added to them during mixing. A so-called homogeneous reinforcement is created in this manner. This, while improving the mechanical properties before failure, governs the post-failure behaviour via a bridging action of the fibers after matrix crack initiation. Thus, plain concrete, which is a quasi-brittle material, acquires ductility and turns into the high performance steel fiber reinforced concrete (SFRC). The behaviour of this SFRC under dynamic compression has been experimentally investigated. Two concrete grades (C100/120, C200/240), based on cementitious mixes containing quarts sand and bauxite, respectively, have been examined using 40mm and 60mm cubic specimens. Three testing conditions have been implemented, that means, static, intermediate strain-rate and higher strain-rate, where for the latter Hopkinson bar techniques have been employed. The entire stress-strain curves have been obtained. The results concerning strength and ductility show that these concrete types exhibit a distinct sensitivity to the applied strainrate, which, however, is moderate compared to the corresponding behaviour of normal concrete.
Compressive behaviour of high performance concrete at dynamic strain-rates
High-strength cementitious materials have been developed based on the Densified Systems with ultrafine Particles (DSP) technology. DSP binders are produced from Portland cement, microsilica, and superplasticizers. However, even these concrete types show a rather low performance when subjected to tensile stresses, and in order to increase fracture toughness and reduce brittleness, steel fibers are added to them during mixing. A so-called homogeneous reinforcement is created in this manner. This, while improving the mechanical properties before failure, governs the post-failure behaviour via a bridging action of the fibers after matrix crack initiation. Thus, plain concrete, which is a quasi-brittle material, acquires ductility and turns into the high performance steel fiber reinforced concrete (SFRC). The behaviour of this SFRC under dynamic compression has been experimentally investigated. Two concrete grades (C100/120, C200/240), based on cementitious mixes containing quarts sand and bauxite, respectively, have been examined using 40mm and 60mm cubic specimens. Three testing conditions have been implemented, that means, static, intermediate strain-rate and higher strain-rate, where for the latter Hopkinson bar techniques have been employed. The entire stress-strain curves have been obtained. The results concerning strength and ductility show that these concrete types exhibit a distinct sensitivity to the applied strainrate, which, however, is moderate compared to the corresponding behaviour of normal concrete.
Compressive behaviour of high performance concrete at dynamic strain-rates
Solomos, George (author) / Berra, Mario (author)
2004
10 Seiten, 6 Bilder, 2 Tabellen, 13 Quellen
Conference paper
English
Compressive behaviour of high performance concrete at dynamic strain-rates
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Compressive Behaviour of Plain Concrete at Higher Strain-Rates
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