Publications Internationales
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Item Strength and compressive behaviour of ultra high-performance fibre-reinforced concrete (UHPFRC) incorporating algerian calcined clays as pozzolanic materials and silica fume(Taylor & Francis, 2013) Rabehi, Bahia; Ghernouti, Youcef; Boumchedda, KhaledItem Strength and compressive behaviour of ultra high-performance fibre-reinforced concrete (UHPFRC) incorporating algerian calcined clays as pozzolanic materials and silica fume(Taylor & Francis, 2013) Rabehi, B.; Ghernouti, Y.; Boumchedda, K.This paper presents results of an experimental study which investigates the effect of four pozzolan additions made from various by-product materials on physical and mechanical properties of ultra-high performance fibre-reinforced concrete (UHPFRC) compared with the silica fume (SF): waste bricks (WB) and three types of metakaolin (MK) as calcined clays at 750 °C: calcined clay of Djbel Debbagh quality 3 (DD), calcined sludge incineration at the manufacture of paper (PS) and calcined silt of dams (SD) having median particle sizes less than 45 μm are used as addition. For each addition, five percentages of steel fibres (1, 1.5, 2, 2.5 and 3%) were used to improve the performance of concrete. The results suggest that the use of WB, PS and SD has no significant effect on the compressive strength as compared with SF concretes. Calcined clay DD can be used as pozzolanic materials in making UHPFRC. This MK competes with the SF, after 28 days of curing, the concrete containing 25% of DD and 2.5% steel fibre presents a compressive strength of 179 MPa compared with the concrete containing 25% of SF and 2.5% steel fibre, which presents strength of 183 MPaItem Contribution of natural pozzolana to durability of high performance concrete in chloride environment(2011) Talah, Aissa; Kharchi, F.; Chaid, R.This paper presents mechanical and durability properties of natural pozzolana high performance concrete. Concrete’s these properties in a chloride environment improved by replacing 7.5% cement with pozzolana of 9600 cm2/g fineness. Reduction of both water absorption and chlorine ion permeability in the specimen showed that natural pozzolana is not only suitable for high performance concrete but also results in better properties than the control concrete