Browsing by Author "Ghernouti, Youcef"

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    Comportament flexibil forfecare a grinzilor de beton armat Întărit de diverse rețele de composite încorporate
    (2020) Aouadi, Abdelhak; Ghernouti, Youcef
    This paper evaluate the flexural–shear behaviour of reinforced concrete beams strengthening by embedded carbon fiber reinforced polymer grids (CFRP grids) and metallic grids with hexagonal meshes, under four-point bending test. An experimental investigation was carried out to evaluate the performance of this new technical of strengthening, Three control beams and fifteen beams strengthened in flexural–shear with different configurations have been tested. Several parameters were considered to highlight the efficiency of the technical used, such as; ultimate load, ductility and failure modes. The experimental results show that the beams strengthening by embedded carbon and metallic grids offered a great improvement in strength, midspan deflection and ductility index; in effect, an influence directly on the failure mode is observed
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    Conception et analyse mécanique de confinement des éléments cylindriques en béton à renforts mixte
    (2009) Ghernouti, Youcef
    Notre projet consiste en une expérience sur l'effet de l'oncorporation des ajouts minéraux dans le béton. Trois ajouts: le laitier granulé d'El Hadjar, lapouzzalone et le calcaire sont broyés en trois finesses (8500, 9500 et 11000 cm2/g) et incorporés dans le ciment avec différentes tenneurs (15%, 5%, 10%) respectivement, en substituant les fines argikeuses du sable, afin d'améliorer la stabilité chimique et les propriétés physico-mécaniques du béton conservé dans quatre milieux de conservation (eau potable, cycle air-eau, eau séléniteuse et eau de mer)
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    Conception of eco-friendly cement based on natural pozzolan to improve rheological behavior of concrete
    (Université Omar Telidji de Laghouat, 2020) Mansour, Sabria Malika; Ghernouti, Youcef
    The pozzolan of Beni-Safregion (North-West Algeria) is a natural material of volcanic origin with the ability to react with cement hydration products and improve its properties. Therefore, its use in the production of new cementitious materials will protect the environment. It will therefore be interesting to exploit this source as a partial cement substitution. In this work, a rheometric investigation was carried out to assess the performance of the natural pozzolan substituted to cement at variable rates ranging from 5%, 10%, 15% to 20% in order to obtain an ecological concrete. As the rheological behavior of concrete depends on the behavior of the cement paste, the effect of pozzolan on the latter was analyzed using static flow tests and dynamic creep and oscillation tests. Theresults of the rheometric tests have shown that in flow, the pozzolan improves the fluidity and in oscillation mode, it generates a viscous behavior of the cementitious pastes compared to elastic behavior of the control paste. Furthermore, the transient study (creep / recovery) made it possible to highlight the liquid viscoelastic character of the cement pastes. With 10% of pozzolan, the rheological behavior of the paste is viscous liquid which seems to be the best. The use of pozzolan as cement substitution has significant environmental, economic and technical advantages, namely the development of natural pozzolan, reduction of CO2 emissions during the manufacture of cement as well as energy reduction and finally improvement of the properties of fresh concrete.
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    Effectiveness of cement and plaster layers in protection of FRP confined concrete exposed to high temperatures
    (Taylor and Francis, 2015) Mostefa, Adda Hadj; Ghernouti, Youcef; Sebaibi, Yahia
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    Effets des ajouts cimentaires ultrafins sur les propriétés Physico-Mécaniques et la durabilité des bétons
    (2002) Ghernouti, Youcef
    Notre projet consiste en une expérience sur l'effet de l'oncorporation des ajouts minéraux dans le béton. Trois ajouts: le laitier granulé d'El Hadjar, lapouzzalone et le calcaire sont broyés en trois finesses (8500, 9500 et 11000 cm2/g) et incorporés dans le ciment avec différentes tenneurs (15%, 5%, 10%) respectivement, en substituant les fines argikeuses du sable, afin d'améliorer la stabilité chimique et les propriétés physico-mécaniques du béton conservé dans quatre milieux de conservation (eau potable, cycle air-eau, eau séléniteuse et eau de mer)
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    Experimental study on steel fibre reinforced self-compacting concrete incorporating high volume of marble powder
    (Taylor & Francis, 2014) Haddadou, Naima; Chaid, Rabah; Ghernouti, Youcef
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    Flexural behavior of damaged reinforced concrete beams repaired with hybrid composites materials
    (SAGE, 2025) Ghernouti, Youcef; Rabehi, Bahia; Haddadou, Naima
    This paper presents an experimental study on the bending behavior of pre-cracked reinforced concrete (RC) beams repaired using hybrid composite materials, specifically carbon and glass fiber-reinforced polymers (CFRP and GFRP). A total of 12 RC beams with identical dimensions (10 × 15) cm2in cross-section and 60 cm in length were manufactured. Three beams served as reference specimens and were loaded to failure without being pre-cracked or repaired. These were compared to nine pre-cracked RC beams that were repaired using composite materials bonded to their surfaces, applied in three distinct geometric configurations. This study focused on assessing the effectiveness of FRP materials in repairing damaged RC beams. It also examined the hybrid effect of these materials on improving flexural behavior and aimed to establish the most effective geometric configuration for structural repair. The experimental results highlight the effectiveness of FRP composites materials in repairing damaged RC beams. Pre-cracked beams repaired with FRPs exhibited improved flexural performance compared to undamaged reference beams, regardless of the repair configuration. Additionally, FRP repairs delayed the formation and propagation of initial cracks. Moreover, test findings revealed that RC beams repaired using hybrid FRP systems displayed greater stiffness compared to their unrepaired beams. Specifically, pre-cracked beams retrofitted with CFRP strips on the bottom surface and GFRP strips inclined at 45° along the vertical faces showed a significant enhancement in load-bearing capacity and a considerable reduction in failure deflection, by approximately 57% and 43%, respectively. These findings confirm the effectiveness of using hybrid FRPs in this specific geometric repair configuration
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    Fresh and hardened properties of self-compacting concrete containing plastic bag waste fibers (WFSCC)
    (Elsevier, 2015) Ghernouti, Youcef; Rabehi, Bahia; Bouziani, Tayeb; Ghezraoui, Hicham; Makhloufi, Abdelhadi
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    Proceedings of the 4th International Symposium on Materials and Sustainable Development
    (Springer, 2020) Safi, Brahim; Daoui, Abdelhakim; Mechakra, Hamza; Ghernouti, Youcef
    This book presents the proceedings of the 4th International Symposium on Materials and Sustainable Development ISMSD2019 (CIMDD2019). Organized by the Research Unit: Materials, Processes and Environment (www.urmpe.dz) and University M'hamed Bougara of Boumerdes, this symposium follows the success of CIMDD 2013-2015-2017 and continues the traditions of the highly successful series of International Conferences on the materials, processes and Environment. The Symposium is a unique topical forum to share the latest results of the materials and sustainable development research in Algeria and worldwide
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    Rheological and mechanical optimization of a steel fiber reinforced self-compacting concrete using the design of experiments method
    (Taylor & Francis, 2019) Gueciouera, Djamila; Ghernouti, Youcef; Naadia, Tarek
    The purpose of this study is to formulate a steel fibre reinforced selfcompacting concrete (SFSCC) that has optimal rheological and mechanical properties, using marble powder as an addition and partial substitution to cement. The design of experiments method (DOE) was used to analyse the effect of fibre dosage (%f), paste volume (Vp) and the gravel/sand ratio (G/S) on the SFSCC. A concrete rheometer is used to quantify the intrinsic rheological parameters. The rheological results of the SFSCC show that the flow capacity decreases with increasing fibre dosage. By against the increase in the volume of the paste (Vp) and the (G/S) ratio decreases the yield stress to give better performance to flow. The plastic viscosity is governed exclusively by the volume of the paste. Mechanical results showed that the volume of the paste has a significant influence on the flexural strength as well as the compression strength. Moreover, significant improvement in flexural strength is recorded when the three parameters (%f, Vp and G/S) increase. Also, the ductility of SFSCC increases with increasing fibre dosage, while the compressive strength is little affected by the latter
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    Use of recycled plastic bag waste in the concrete
    (2014) Ghernouti, Youcef; Rabehi, Bahia; Safi, Brahim; Chaid, Rabah
    The aim of this study is to explore the possibility of re-cycling a plastic bag waste material (BBW) that is now produced in large quantities in the formulation of concrete as fine aggregate by substitution of a variable percentage of sand (10, 20, 30 and 40 %). The influence of the PBW on the fresh and hardened states properties of the concrete: workability, bulk density, ultrasonic pulse velocity testing, compressive and flexural strength of the different concretes, has been investigated and analyzed in comparison to the control concrete. The results showed that the use of PBW improves the workability and the density, reduces the compressive strength of concrete containing 10 and 20 % of waste by 10 to 24 % respectively, which have a mechanical strength acceptable for lightweight materials, remains always close to reference concrete (made without PBW). The results of this investigation consolidate the idea of the use of PBW in the field of construction, especially in the formulation of concrete