Browsing by Author "Hami, Brahim"

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Effect of metakaolin as partially cement replacement on the compressive strength of standard mortars
(2021) Amrane, Belaid; Souici, Khaled; Hami, Brahim; Kennouche, Salim; Safi, Brahim
This study presents the effect of incorporating synthesized metakaolin on the compressive strength of standard mortars for a constant water/binder ratio of 0.5. Synthesized metakaolin mixtures with cement replacement of 5, 10, 15 and 20% were tested. From the results, it was observed that 15 % replacement level was the optimum level in terms of compressive strength. Beyond 15 % replacement levels, the strength was decreased but remained higher than the control mixture. Compressive strength of 52 MPa was achieved at 15 % replacement. This investigation has shown that it is possible to produce high strength mortars using local kaolin.
Elaboration et caractérisation d'un matériau composite à base de fibres de verre et de résine polyester et étude de son comportement au choc
(2010) Hami, Brahim
Ce travail a pour objet d'étudier les caractéristiques mécanique en flexion 3 points, en traction et en compression; en statique; et du comportement au choc de différents stratifiés constitués du mat et du tissé en fibres de verre et de résine polyester. L'étude des caractéristiques mécanique a permis de voir l'effet de type des fibres de verre ( mat et tissé) ainsi que leurs associations sur la qualité du matériau obtenu. L'analyse des résultats des essais menés sur cinq types de stratifiés montre la meilleur variante qui donne les performances mécanique les plus élevées
Elaboration et caractérisation physico-mécanique d’une structure sandwiche multicouches
(2018) Hami, Brahim
Notre projet présente une étude expérimentale qui consiste à déterminer les caractéristiques physico-mécaniques et thermiques d’un matériau composite de type sandwich multicouches. Ce dernier a été élaboré au niveau du laboratoire de mécanique des matériaux et composites, de l’unité de recherche matériaux, procédés et environnement de l’université de Boumerdes. Cette nouvelle structure sandwich est constituée de couches en matériaux composites, stratifiées, à base d’une résine époxy renforcée par des fibres de verre du type tissé et mat ; entre lesquelles se trouvent des plaques de liège aggloméré, empilées alternativement avec les couches de stratifiés. Tout d’abord, les matériaux utilisés dans le cadre de cette étude ont été présentés et caractérisés par des essais physico-mécaniques ; le matériau de l’âme de la structure sandwiche est le liège aggloméré. Tandis que la résine époxy et la fibre de verre constituent les peaux de la structure sandwiche. D’après les résultats des essais de flexion trois et quatre points, on a constaté que les trois structures sandwiches testées présentent un comportement linéaire élastique depuis le début de chargement. Mais il existe une légère déformation plastique pour des déplacements plus élevés. En fait, la dégradation affectant les structures sandwiches commence par une petite fissure de cisaillement, qui se propage depuis la zone chargée suivant la direction du plan médian vers les bouts de l'échantillon. Les structures sandwiches des trois séries (S5, S10 et S20) présentent le même mode de rupture lors des essais de traction perpendiculaire : la rupture des éprouvettes se produit la plupart du temps au niveau du matériau de l’âme de la structure sandwiche (liège aggloméré). Par la suite, la fissure se propage rapidement d’une façon perpendiculaire à la force du chargement. Les résultats de cette étude, nous ont permis de valoriser une variété de liège aggloméré blanc produit en Algérie, dans le but de l’utiliser dans la construction, comme des murs de cloison et dans le domaine du transport pour leur bonne isolation thermique
Etude Du Comportement Au Choc D’un Matériau Composite Renforcé Par Des Fibres De Verre
(Unité de Recherche Matériaux, Procédés et Environnement (URMPE), Université M'Hamed Bougara, Boumerdès.Cité Frantz Fanon, 35000 Boumerdès, Algérie, 2013) Hami, Brahim; Irekti, A.; Bezzazi, B.
Ce travail a pour objet d’étudier les caractéristiques mécaniques en flexion 3 points et en traction; en statique; et du comportement au choc de trois variantes de stratifiés constitués du mat et du tissé en fibres de verre et de résine polyester, dans le but de les utiliser dans la réparation des coques de bateaux et les valoriser dans l’industrie navale. Trois types de plaques stratifiés ont été élaborés par moulage au contact, Ces différentes variantes de stratifiés constitués defibre de verre tissé, mat et combiné (tissé et mat) ont été soumises à des essais mécaniques (traction et flexion 3 points). L’analyse des résultats des essais menés sur ces trois types de stratifiés montre qu’une variante sort du lot et donne des performances mécaniques plusélevées que les deux autres.
Evaluation of the performance of local cement for oil well cementing operations in Algeria
(2018) Oualit, Mehena; Irekti, Amar; Hami, Brahim
The cementing of oil wells is done using special cement called ‘’class G cement’’, whose properties should meet the requirements of the American Petroleum Institute (API). Algeria, which ranks high among the oil and gas producing countries, has recently begun production of petroleum cement. The aim of this work is to characterize and evaluate the performance of a locally manufactured cement sample intended for oil and gas well cementing operations in Algeria. In this paper, significant properties (thickening time, compressive strength and free water) as well as the rheological behavior of the cement slurry under specific conditions have been experimentally examined. Apart from the initial consistency, which could be resolved by incorporating additives, the results indicated that the locally produced cement meets the requirements of the API standards and can therefore be used for cementing oil and gas wells
Experimental study of sandwich multilayer reinforced by glass fibre and agglomerated cork
(2014) Hami, Brahim; Irekti, Amar; Aribi, C.; Bezzazi, B.; Mir, A.
This paper presents an experimental study which is determined the mechanical properties of a composite material sandwich multilayer developed in the laboratory of mechanics of materials and composites, Materials Research Unit, process and en¬vironment. This type of sandwich is composed of four layers laminated based on an epoxy resin reinforced by woven glass fibres and mast between which three plates of agglomerated cork with stacked alternately laminated layers. Specimens for bending tests three and four points were prepared from the multilayer sandwich panels. A first series of static three-point bending tests shows a clear difference in the fracture behaviour for materials, laminate and cork. These materials have undergone a large plastic deformation without rupture achieve full sandwich, with the onset of delamination between layers laminated material and cork. In order to determine the bending stiffness modules D, the shear modulus and flexural N and the shear modulus of the soul Ga, we conducted a second test campaign four points bending. As a result, we can develop a variety of white cork produced in Algeria in order to use it in the construction and automotive industries
Formulation and characterization of self compacting concrete with silica fume
(Academic journals, 2013) Kennouche, S.; Zerizer, A.; Benmounah, A.; Hami, Brahim; Mahdad, M.; Benouali, H.; Bedjou, S.
Self-compacting concrete (SCC) was elaborated using local materials and silica fume (SF) as admixture in 15% of cement quantity, two different Portland cements (PC) and two different superplasticizer that the chemical nature is polycarboxylate and plynaphtalene, the aggregates used are (AG 3/8 mm, AG 8/15 mm), coarse and fine sand (SC, SF) witch fineness modulus 3.2 and 1 in the order. The dosage of the different superplasticizer used is chosen after experimental spreading tests of each self compacting concrete formulation. Results of fresh concrete tests executed, as L-box and segregation resistance are on concordance whit values recommended by the French association of civil engendering. Also the mechanical characterization was conducted by compressive strength and splitting compression testing procedure, results values are in the range higher than 20 Mpa at the seven day by the compressive test for the all compositions, and the highest value was 40.93 MPa at the 28 day bay compressive test of the fourth’s formulation specimens, the values of splitting compressive tests of al formulation specimens at 7, 14 and 28 days, was situated between 2.01 and 4.40 MPa. In order to determine the superplasticizer saturation assay in of cement pasts used in self compacting concrete, the stady was completed by a rheological stady with a variable velocity gradient, so as to estimate the quantity of saturation assay of superplasticizer and the formulation, also the flow models of cement paste
Performance of recycled asphalt mixtures formulated with modified bitumen
(Gheorghe Asachi Technical University of Iasi, Romania, 2019) Oualit, Mehena; Irekti, Amar; Hami, Brahim
The maintenance of flexible roads or roads at end of life service generates high quantities of reclaimed asphalt pavement every year. The reuse of these materials, considered for a long time as waste, allows a substantial saving in transport, energy, and maintains dwindling natural resources. Recycling of asphalt also helps to reduce inert waste storage volumes, and conserve valuable landfill space. The applicability of recycled asphalt was tested in laboratory, and asphalt mixtures containing 20%, 40% and 50% of reclaimed asphalt pavement (RAP) were designed. Marshall and Duriez tests have been performed on various formulations using paving grade bitumen and modified bitumen as binders, the latter contains a quantity of Styrene /Butadiene / Styrene (SBS) polymer. This investigation led to the conclusion that the performance of recycled asphalt mixture containing 20% of RAP is significantly closer to those obtained with virgin asphalt mixture without recycled materials. In addition, the use of SBS polymer improves the properties of recycled asphalt mixtures even with high amounts of reclaimed asphalt pavement.
Rheological behavior of the epoxy resin loaded with the pozzolan
(2012) Irekti, Amar; Hami, Brahim; Aribi, C.; Bezzazi, B.; Briki, I.
The study is to synthesize composite materials with news formul ations of thermosetting matrices by the incorporation of 40% of mineral fillers to reduce the cost of composite materials an d to improve implementation by increasing the viscosity and redu cing the withdrawal to its minimum value. The mineral filler increases si gnificantly in rheological parameters, whatever it nature of th e mineral filler. Compared to the control without charges, an increase of 60% of the shear stress and that of plastic viscosity were reco rded for the epoxy resin. The software Rheowine viscometer enabled us to m odel and identified the rheological behavior of these mixtures wit h resin. The results obtained in this modeling, confirmed that th e resin mixtures have shear-thinn ing rheological behavior, this last allows the model of the Ostwald de Waele