Mohamed Chemrouk | Université des Sciences et Technologie Houari Boumediene (USTHB) (original) (raw)
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Papers by Mohamed Chemrouk
Advances in Structural Engineering, 2010
The paper describes a study in which sixteen reinforced concrete beams without transverse stirrup... more The paper describes a study in which sixteen reinforced concrete beams without transverse stirrups were tested to failure to investigate the influences of the shear-span/depth ratio ( a/d), the longitudinal steel ratio (ρ) and the compressive strength of concrete ( f'c) on the global behaviour in shear for beams made of normal strength concrete (NSC) as well as high strength concrete (HSC). Crack development and propagation were studied through continuous monitoring of the shear cracking using digital video recording. The test results show that the shear capacity depends more on the shear-span/depth ratio ( a/d) and the longitudinal steel ratio (ρ) and relatively less so on the compressive strength ( f'c) in the case of HSC. Based on this study and on data collected from the literature, a proposition for computing the shear stength of concrete beams without stirrups is made; it covers compressive strengths in the range of 40 MPa to 104 MPa. Using the proposed shear formulae,...
Revue européenne de génie civil, 2009
Advances in Structural Engineering, 2012
This paper presents the results of an experimental investigation dealing with the effects of tran... more This paper presents the results of an experimental investigation dealing with the effects of transverse reinforcement on the crack patterns, the ultimate carrying capacity and the ductility of beams made of high strength concrete and normal strength concrete for comparison purposes. The test results are analyzed and compared with the shear provisions in the four major universal codes (ACI-318; BS-8110; Eurocode 2; BAEL 99). Twenty six reinforced concrete beams with and without transverse reinforcement were constructed using different shear-span to depth ratios (a/d = 1.5, 2.0 and 3.0) and different compressive strengths of concrete (44 MPa, 65 MPa and 86 MPa). The test results indicate that the presence of transverse reinforcement had controlled efficiently the crack width by enhancing the aggregate interlocking on the crack surface, increased moderately the shear strengths of the beams by factors ranging from 1.14 to 1.86, and increased appreciably the ductility of beams at the ult...
RESUME. L'objectif de cet article est d'etudier l'effet de la resistance du beton et ... more RESUME. L'objectif de cet article est d'etudier l'effet de la resistance du beton et la presence des fibres metalliques sur la resistance au fendage et la ductilite des betons fibres. Les principaux parametres du programme d'essai sont : la resistance a la compression, le dosage et elancement (longueur/diametre) des fibres. Les resultats montrent que la presence des fibres et la resistance a la compression du beton ont un effet significatif sur le comportement du beton fibre au fendage. Les fibres se sont averees plus efficaces dans les matrices a hautes resistances, en augmentant a la fois la charge ultime et la ductilite. Cette augmentation est attribuee a la bonne qualite d'adherence entre les fibres et la matrice; une augmentation allant jusqu'a 70% a ete enregistree. Les resultats montrent l'existence de deux mecanismes de rupture, le premier est associe a une fissure centrale, le second a des fissures secondaires initiees au niveau des bandes de cha...
Construction and Building Materials, 2015
ABSTRACT This research aims to demonstrate the effectiveness of confinement with a composite carb... more ABSTRACT This research aims to demonstrate the effectiveness of confinement with a composite carbon fiber on reducing buckling instabilities, and highlight the changes in behavior of slender columns of reinforced concrete. For this purpose, an experimental study on six square-section slender reinforced concrete columns is conducted. The columns were confined by single-layer wraps of carbon fiber composites. They were tested under a doubly eccentric compressive load. The resulting tests were illustrated by the load–deflection, load–moment and moment–curvature responses and bending moment–axial force diagrams. Various characteristics such as strength, stiffness, ductility, the ability to absorb the energy of deformation were discussed.
Procedia Engineering, 2015
Construction and Building Materials, 2016
The objective of this experimental investigation is the study of the mechanical performance of po... more The objective of this experimental investigation is the study of the mechanical performance of polypropylene fibre concretes. The fibres used in this work are coming from an industrial waste which results from the fabrication of domestic brushes and sweeps. The length of the fibres is 50mm and their dosage is 0.5% by weight. The obtained results confirmed the efficiency of the polypropylene fibers on the amelioration of the flexural tensile and splitting strength of concrete, the percentage of this amelioration at 28 ages is about 14% and 49% respectively compared to the concrete without fibres. The behaviour of concrete beams with longitudinal reinforcement is clearly improved by the addition of polypropylene fibres, the flexural strength in fibrous beams is increased by almost 24% compared to beams without fibres.
Déchets, sciences et techniques, 2010
MATEC Web of Conferences, 2012
Physics Procedia, 2011
ABSTRACT The first objective of this study is the valorisation of limestone waste produced from t... more ABSTRACT The first objective of this study is the valorisation of limestone waste produced from the crushing stations by using it as fine sand for mortars mixes and hence replaces the river sand. The second objective of this research is the reinforcement of mortars by polypropylene fibers waste coming from the fabrication of domestic brushes and sweeps. Due to their low weight, high deformation rate and does not react with cement elements, the polypropylene fibers are among the most used one for the reinforcement of concretes. In this paper we presented the results of physical and-mechanical properties of reinforced mortars prepared with limestone sand which is in abundance in the city of Laghouat situated in 400km in the South of the capital of Algeria (Algiers). The fibers dosages used are: 0.5, 1, 2 and 4wt% with length of 10, 20 and 30mm. The results of this investigation put in evidence the efficiency of the reinforcement of limestone mortars by polypropylene fibers waste in the improvement of their flexural tensile and compression strength.
European Journal of Environmental and Civil Engineering, 2013
Revue européenne de génie civil, 2009
MATEC Web of Conferences, 2014
Advances in Structural Engineering, 2010
The paper describes a study in which sixteen reinforced concrete beams without transverse stirrup... more The paper describes a study in which sixteen reinforced concrete beams without transverse stirrups were tested to failure to investigate the influences of the shear-span/depth ratio ( a/d), the longitudinal steel ratio (ρ) and the compressive strength of concrete ( f'c) on the global behaviour in shear for beams made of normal strength concrete (NSC) as well as high strength concrete (HSC). Crack development and propagation were studied through continuous monitoring of the shear cracking using digital video recording. The test results show that the shear capacity depends more on the shear-span/depth ratio ( a/d) and the longitudinal steel ratio (ρ) and relatively less so on the compressive strength ( f'c) in the case of HSC. Based on this study and on data collected from the literature, a proposition for computing the shear stength of concrete beams without stirrups is made; it covers compressive strengths in the range of 40 MPa to 104 MPa. Using the proposed shear formulae,...
Revue européenne de génie civil, 2009
Advances in Structural Engineering, 2012
This paper presents the results of an experimental investigation dealing with the effects of tran... more This paper presents the results of an experimental investigation dealing with the effects of transverse reinforcement on the crack patterns, the ultimate carrying capacity and the ductility of beams made of high strength concrete and normal strength concrete for comparison purposes. The test results are analyzed and compared with the shear provisions in the four major universal codes (ACI-318; BS-8110; Eurocode 2; BAEL 99). Twenty six reinforced concrete beams with and without transverse reinforcement were constructed using different shear-span to depth ratios (a/d = 1.5, 2.0 and 3.0) and different compressive strengths of concrete (44 MPa, 65 MPa and 86 MPa). The test results indicate that the presence of transverse reinforcement had controlled efficiently the crack width by enhancing the aggregate interlocking on the crack surface, increased moderately the shear strengths of the beams by factors ranging from 1.14 to 1.86, and increased appreciably the ductility of beams at the ult...
RESUME. L'objectif de cet article est d'etudier l'effet de la resistance du beton et ... more RESUME. L'objectif de cet article est d'etudier l'effet de la resistance du beton et la presence des fibres metalliques sur la resistance au fendage et la ductilite des betons fibres. Les principaux parametres du programme d'essai sont : la resistance a la compression, le dosage et elancement (longueur/diametre) des fibres. Les resultats montrent que la presence des fibres et la resistance a la compression du beton ont un effet significatif sur le comportement du beton fibre au fendage. Les fibres se sont averees plus efficaces dans les matrices a hautes resistances, en augmentant a la fois la charge ultime et la ductilite. Cette augmentation est attribuee a la bonne qualite d'adherence entre les fibres et la matrice; une augmentation allant jusqu'a 70% a ete enregistree. Les resultats montrent l'existence de deux mecanismes de rupture, le premier est associe a une fissure centrale, le second a des fissures secondaires initiees au niveau des bandes de cha...
Construction and Building Materials, 2015
ABSTRACT This research aims to demonstrate the effectiveness of confinement with a composite carb... more ABSTRACT This research aims to demonstrate the effectiveness of confinement with a composite carbon fiber on reducing buckling instabilities, and highlight the changes in behavior of slender columns of reinforced concrete. For this purpose, an experimental study on six square-section slender reinforced concrete columns is conducted. The columns were confined by single-layer wraps of carbon fiber composites. They were tested under a doubly eccentric compressive load. The resulting tests were illustrated by the load–deflection, load–moment and moment–curvature responses and bending moment–axial force diagrams. Various characteristics such as strength, stiffness, ductility, the ability to absorb the energy of deformation were discussed.
Procedia Engineering, 2015
Construction and Building Materials, 2016
The objective of this experimental investigation is the study of the mechanical performance of po... more The objective of this experimental investigation is the study of the mechanical performance of polypropylene fibre concretes. The fibres used in this work are coming from an industrial waste which results from the fabrication of domestic brushes and sweeps. The length of the fibres is 50mm and their dosage is 0.5% by weight. The obtained results confirmed the efficiency of the polypropylene fibers on the amelioration of the flexural tensile and splitting strength of concrete, the percentage of this amelioration at 28 ages is about 14% and 49% respectively compared to the concrete without fibres. The behaviour of concrete beams with longitudinal reinforcement is clearly improved by the addition of polypropylene fibres, the flexural strength in fibrous beams is increased by almost 24% compared to beams without fibres.
Déchets, sciences et techniques, 2010
MATEC Web of Conferences, 2012
Physics Procedia, 2011
ABSTRACT The first objective of this study is the valorisation of limestone waste produced from t... more ABSTRACT The first objective of this study is the valorisation of limestone waste produced from the crushing stations by using it as fine sand for mortars mixes and hence replaces the river sand. The second objective of this research is the reinforcement of mortars by polypropylene fibers waste coming from the fabrication of domestic brushes and sweeps. Due to their low weight, high deformation rate and does not react with cement elements, the polypropylene fibers are among the most used one for the reinforcement of concretes. In this paper we presented the results of physical and-mechanical properties of reinforced mortars prepared with limestone sand which is in abundance in the city of Laghouat situated in 400km in the South of the capital of Algeria (Algiers). The fibers dosages used are: 0.5, 1, 2 and 4wt% with length of 10, 20 and 30mm. The results of this investigation put in evidence the efficiency of the reinforcement of limestone mortars by polypropylene fibers waste in the improvement of their flexural tensile and compression strength.
European Journal of Environmental and Civil Engineering, 2013
Revue européenne de génie civil, 2009
MATEC Web of Conferences, 2014