Abstract
Reactive Powder Concretes (RPC) are a set of ultrahigh-strength concretes reinforced with steel fibers. Their compressive strength is between 200 and 800MPa, and their flexural strength can reach 140MPa.RPC200 has been studied with respect to compressive strength and two-point loading strength to define its mechanical behavior.RPC800, which has been mostly studied from the point of view of compressive strength, displays hardening elastic non-linear behavior at low stress. This behavior is similar to that of some natural rocks. The critical stress intensity factorK Ic , and the average fracture energy,\(\bar G_F \), ofRPC200 andRPC800 have been studied experimentally by applying the theory of linear fracture mechanics (compliance method). The fracture energy, which is a measurement of ductility, can reach 40,000 J/m2 forRPC200, as compared to 100 to 150 J/m2 for ordinary concretes. Fracture energy depends on the volume of fibers added to the concrete. The optimum content is between 2 and 3% by volume.
Résumé
Les Bétons de Poudres Réactives (BPR) constituent une famille de bétons à ultra hautes performances renforcés de fibres métalliques. Leur résistance en compression se situe entre 200 et 800 MPa et leur résistance en flexion peut atteindre 140 MPa. Le BPR200 a été étudié en compression et en flexion 4-points pour définir son comportement mécanique. Le BPR800, étudié principalement en compression, présente un comportement non linéaire élastique à faible contrainte. Ce comportement s'apparente à celui de certaines roches naturelles. Le facteur d'intensité de contrainte KIc et l'énergie moyenne de fracturation\(\bar G_F \) du BPR20 et du BPR800 ont été étudiés expérimentalement en appliquant la théorie de la mécanique linéaire de la rupture (méthode de la complaisance). L'énergie de fracturation qui caractérise la ductilité peut atteindre 40 000 J/m2 pour le BPR200 à comparer à des valeurs de 100 à 150 J/m2 pour les bétons traditionnels. L'énergie de fracturation dépend du volume de fibres ajouté au béton. Le dosage optimal se situe entre 2 et 3 vol-%.
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Editorial note Gérard Bernier is working at the Laboratoire de Mécanique et de Technologie, École Normale Supérieure, Cachan (France). This laboratory is a RILEM Associate Member.
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Dugat, J., Roux, N. & Bernier, G. Mechanical properties of reactive powder concretes. Mat. Struct. 29, 233–240 (1996). https://doi.org/10.1007/BF02485945
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DOI: https://doi.org/10.1007/BF02485945