Publications Scientifiques

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    Static and cyclic behavior of concrete reinforced with materials composite
    (Université M'Hamed Bougara Boumerdes, 2013) Irekti, Amar; Hami, B.; Aribi, C.; Abadlia, Mohamed Tahar
    This work includes the test results of static and cyclic compression specimens of plain concrete and reinforced by several folds of woven fiberglass. The static compression tests were performed at a constant speed with gradual increase of the load. The results are expressed by curves representing the change of stress as a function of the strain to failure. The results give us three phases of behavior: a phase behavior similar to that of a homogeneous and elastic material resulting in an almost linear relationship between stress and strain. The second phase of development of shattered concrete that leads to progressive curvature of the curve until the maximum stress (σmax) for a certain amount of strain (ε), and third in imposing increases distortion, we can get a decreasing curve corresponding to the accentuation of the rupture, that is to say in the development of fracture surfaces and cracking more or less widespread. The cyclic compression tests were conducted under load imposed on a percentage of the maximum load in static fracture, with a change in the number of cycles for each set of specimens. The results of cyclic compression tests show that the loss of stiffness to failure of the specimen is divided into three phases: in the first phase shows a gradual reduction of stiffness in the early rounds in the second phase decreased rigidity becomes slow, and finally in the third phase, the loss of stiffness abruptly accelerates to failure of the specimen
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    Impact of the nature of fibers on the physicomechanical behavior and durability of cement matrices
    (Springer, 2021) Aboutair, Wafaa; Chaid, Rabah; Perrot, Arnaud
    In this paper, the strength of concrete prismatic and cylinders concrete and reinforced with steel and polypropylene fibers are presented. Also, hybrid fibers with crimped steel and polypropylene were used in concrete matrix to study its improvements in strength and durability properties. The steel, polypropylene, and hybrid consisting of polypropylene and steel (crimped) fibers of various proportions by volume of cement were used in concrete mixes. Besides cubes, cylinders of 160 mm diameter X 320 mm high of concrete were cast with steel fiber, polypropylene fiber, and hybrid fiber, respectively, by volume of cement. The water absorption test was conducted on 28 and 90 days, and the test results show that the addition of steel and polypropylene fibers to concrete exhibits better performance. The test results show that use of steel fiber-reinforced concrete improves compressive strength and split tensile strength. The durability of such concrete is also improved
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    Granulated foam glass based on mineral wastes used for building materials
    (SAGE, 2017) Chahour, Kahina; Aboutaleb, Djamila; Safi, Brahim; Mazari, Tassadit; Zeghad, Mohamed
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    Recycling of brick and demolition concrete aggregates wastes in the self compacting concrete
    (2017) Ghernouti, Y.; Rabehi, B.; Ziani, Nesrine; Tamazirt, S.
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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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    Rheology of mortar and concrete containing mineral admixtures = Reologia zapraw i betonów z dodatkami mineralnymi
    (Foundation Cement, Lime, Concrete, 2013) Mansour, M.S.; Abadlia, Mohamed Tahar; Afalfiz, A.; Ladaoui, W.
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    Microstructure and permeability of concrete with glass powder addition conserved in the sulphatic environment
    (Taylor and Francis, 2014) Chaid, R.; Kenaï, S.; Zeroub, H.; Jauberthie, R.
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    Performance and analysis of concrete in sewer environment : anisotropy of damage
    (2011) Oualit, M.; Jauberthie, R.; Melinge, Y.; Abadlia, Mohamed Tahar
    The costs associated with the provision and maintenance of drinking water and wastewater infrastructure represents a significant financial demand worldwide. Maintenance costs are disproportionately high, indicating a lack of adequate durability. The aim of this paper is to study the degradation mode and the responsible factors of deterioration concrete pipe, used in the sewage’s city of Rennes (France). Thus, samples taken from different areas of the pipe (Raft, medium and roof) were analyzed using investigation methods in order to illustrate the internal and external rate of damage, caused by effluents and ground. In addition, chemical and mineralogical changes recorded were identified using scanning electron micrographs (SEM). In this research program, chemical and mechanical studies were performed by measuring the compressive and splitting tensile strengths. A phenolphthalein indicator solution is applied to a concrete specimen on a fresh fracture surface to determine the corrosion of steel reinforcement and the diseases advancement (pathologies depth). This study clearly shows the important anisotropy of both, internal and external damage. Finally, recommendations are proposed in line with the environment and possible approaches to sustainability assessment are also imposed
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    Multiple confinements of concrete columns by various embedded composite grids
    (2008) Ghernouti, Y.; Ait Tahar, K.
    This study exhibits the experimental results of axial compression tests on concrete cylinders, circumferentially confined by the set-up of the composite grids arranged inside the cylinder, according to several combinations of circumscribed grids. The main aim is to verify the applicability of this method and then to quantify the contribution to strength improvement due to confinement as well as its influence on the rupture mode under axial compression. The test results of loading carried out on cylindrical concrete specimens, confined by alveolus composite grids arranged inside the section, show that it is possible to substantially increase the ductility of the columns, and in certain cases, their strength. It is also noted that the rupture of confined concrete is highly influenced by the presence of the grids depending on the configuration and the shape of the cells (rhombus or hexagonal) constituting the composite grid. The experimental results are compared with the theoretical model data