Publications Internationales

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Author: search.filters.author.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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    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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    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
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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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    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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    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