75 research outputs found
Editorial
No full textIt is already three years since the launch of the first issue of the Journal of Materials and Engineering Structures (JMES) in 2014, with eleven (11) issues already published. We are preparing to start this fourth year with the publication of this twelfth issue, which contains five articles from four different countries (Egypt, Morocco, India and Nigeria).The first article is devoted to the study the effect of stirrups as shear reinforcement in enhancing the punching strength of interior slab-column connections. The parameters of the study are the presence of shear reinforcement and stirrups concentration around the supporting column. The article shows that a good distribution of the stirrups on the critical perforation shear zone is an efficient solution to enhance not only the punching shear capacity but also the ductility of the connection.The second paper deals with the dislocation nucleation phenomena in nanomaterials obtained by hetero-epitaxial growth of thin films on substrates having lattice mismatch defects. The article develops theoretical calculation on the principle of nucleating edge dislocations from free lateral surfaces by the theoretical calculation, using the method of image stress and energy study.The third article presents a study the development of Self Compacting Concrete (SCC) using copper slag (CS) as fine aggregates with partial and full replacement of sand. The authors observed that the fluidity of SCC mixes was significantly enhanced with the increment of copper slag. The results of the tests showed that copper slag has the potential to replace sand in the range of 40-60% to obtain SCC with desirable fresh and strength properties. The use of copper slag (industrial waste) reduces the dosage of superplasticizer, consumption of natural resources which is a solution to decline the cost of concrete and boon for construction industry.The fourth paper aims to assess geotechnical properties of uncemented/cemented clayey soil incorporated with waste crumb rubber. Authors concluded that unconfined compressive strength and split tensile strength of rubberized cemented clayey soil decreases with the increase of the percentage of crumb rubber whereas the axial, and diametral strain are found to be increased with the addition of crumb rubber up to 5% after that it starts to decrease. The CBR values (California Bearing Ratio), swelling pressure, and toughness index of uncemented/cemented clayey soil was significantly affected by incorporation of crumb rubber.The fifth paper investigated the effect of fly ash, silica fume and metakaolin on the air permeability of Portland cement concrete at equal water/cement ratios and strengths. At equal water/cement ratios, while fly ash binary cement concretes have higher coefficients of air permeability than Portland cement concrete due to delayed pozzolanic reactivity, silica fume and metakaolin binary cement concretes have comparable coefficients with Portland cement concrete. The ternary cement concretes have coefficients comparable with that of Portland cement concrete. The author concluded that high volume fly ash would be required to increase the resistance of concrete to air permeability at equal strength.During the first few years of JMES existence, we have tried to respect the regularity in the publication of the issues with a quarterly frequency, and by publishing for each issue a number of articles ranging from four to five with the goal of maintaining a certain level of scientific quality which reflects the ambitions and objectives that JMES has set itself.At the moment when we are closing this twelfth issue, JMES is being evaluated by two of the most respectable scientific databases which are DAOJ (Directory of Open Access Journals - https://doaj.org) and COMPENDEX (https://www.elsevier.com/solutions/engineering-village/content/compendex). All this would not have been possible without the assistance and the help of expert colleagues, who have done us the honor of evaluating the numerous papers submitted to the JMES during its first three years of existence. We are also taking advantage of this opportunity to renew our confidence in the members of the Reading Committee for the next years.The journal JMES which is yours continues its reflection on its evolution and aims to position itself as a scientific journal indexed in scientific databases respectable and recognized by the international scientific community. It is in this mind that the Editorial team reiterates its call to all national and foreign researchers to contribute by the quality of their articles to the success of JMES which is theirs and which is a tool for promotion and sharing of their research through their publication.We wish you a good reading. Editor in Chief: Dr. Farid ASMA, Senior lecturer, Department of mechanical engineering, University of Mouloud Mammeri, Tizi Ouzou, AlgeriaAssociate Editor: Dr. Hocine HAMMOUM, Senior lecturer, Department of civil engineering, University of Mouloud Mammeri, Tizi Ouzou, Algeria
Editorial
No full textIt is already three years since the launch of the first issue of the Journal of Materials and Engineering Structures (JMES) in 2014, with eleven (11) issues already published. We are preparing to start this fourth year with the publication of this twelfth issue, which contains five articles from four different countries (Egypt, Morocco, India and Nigeria).The first article is devoted to the study the effect of stirrups as shear reinforcement in enhancing the punching strength of interior slab-column connections. The parameters of the study are the presence of shear reinforcement and stirrups concentration around the supporting column. The article shows that a good distribution of the stirrups on the critical perforation shear zone is an efficient solution to enhance not only the punching shear capacity but also the ductility of the connection.The second paper deals with the dislocation nucleation phenomena in nanomaterials obtained by hetero-epitaxial growth of thin films on substrates having lattice mismatch defects. The article develops theoretical calculation on the principle of nucleating edge dislocations from free lateral surfaces by the theoretical calculation, using the method of image stress and energy study.The third article presents a study the development of Self Compacting Concrete (SCC) using copper slag (CS) as fine aggregates with partial and full replacement of sand. The authors observed that the fluidity of SCC mixes was significantly enhanced with the increment of copper slag. The results of the tests showed that copper slag has the potential to replace sand in the range of 40-60% to obtain SCC with desirable fresh and strength properties. The use of copper slag (industrial waste) reduces the dosage of superplasticizer, consumption of natural resources which is a solution to decline the cost of concrete and boon for construction industry.The fourth paper aims to assess geotechnical properties of uncemented/cemented clayey soil incorporated with waste crumb rubber. Authors concluded that unconfined compressive strength and split tensile strength of rubberized cemented clayey soil decreases with the increase of the percentage of crumb rubber whereas the axial, and diametral strain are found to be increased with the addition of crumb rubber up to 5% after that it starts to decrease. The CBR values (California Bearing Ratio), swelling pressure, and toughness index of uncemented/cemented clayey soil was significantly affected by incorporation of crumb rubber.The fifth paper investigated the effect of fly ash, silica fume and metakaolin on the air permeability of Portland cement concrete at equal water/cement ratios and strengths. At equal water/cement ratios, while fly ash binary cement concretes have higher coefficients of air permeability than Portland cement concrete due to delayed pozzolanic reactivity, silica fume and metakaolin binary cement concretes have comparable coefficients with Portland cement concrete. The ternary cement concretes have coefficients comparable with that of Portland cement concrete. The author concluded that high volume fly ash would be required to increase the resistance of concrete to air permeability at equal strength.During the first few years of JMES existence, we have tried to respect the regularity in the publication of the issues with a quarterly frequency, and by publishing for each issue a number of articles ranging from four to five with the goal of maintaining a certain level of scientific quality which reflects the ambitions and objectives that JMES has set itself.At the moment when we are closing this twelfth issue, JMES is being evaluated by two of the most respectable scientific databases which are DAOJ (Directory of Open Access Journals - https://doaj.org) and COMPENDEX (https://www.elsevier.com/solutions/engineering-village/content/compendex). All this would not have been possible without the assistance and the help of expert colleagues, who have done us the honor of evaluating the numerous papers submitted to the JMES during its first three years of existence. We are also taking advantage of this opportunity to renew our confidence in the members of the Reading Committee for the next years.The journal JMES which is yours continues its reflection on its evolution and aims to position itself as a scientific journal indexed in scientific databases respectable and recognized by the international scientific community. It is in this mind that the Editorial team reiterates its call to all national and foreign researchers to contribute by the quality of their articles to the success of JMES which is theirs and which is a tool for promotion and sharing of their research through their publication.We wish you a good reading. Editor in Chief: Dr. Farid ASMA, Senior lecturer, Department of mechanical engineering, University of Mouloud Mammeri, Tizi Ouzou, AlgeriaAssociate Editor: Dr. Hocine HAMMOUM, Senior lecturer, Department of civil engineering, University of Mouloud Mammeri, Tizi Ouzou, Algeria
Editorial
No full textIt is already three years since the launch of the first issue of the Journal of Materials and Engineering Structures (JMES) in 2014, with eleven (11) issues already published. We are preparing to start this fourth year with the publication of this twelfth issue, which contains five articles from four different countries (Egypt, Morocco, India and Nigeria).
The first article is devoted to the study the effect of stirrups as shear reinforcement in enhancing the punching strength of interior slab-column connections. The parameters of the study are the presence of shear reinforcement and stirrups concentration around the supporting column. The article shows that a good distribution of the stirrups on the critical perforation shear zone is an efficient solution to enhance not only the punching shear capacity but also the ductility of the connection.
The second paper deals with the dislocation nucleation phenomena in nanomaterials obtained by hetero-epitaxial growth of thin films on substrates having lattice mismatch defects. The article develops theoretical calculation on the principle of nucleating edge dislocations from free lateral surfaces by the theoretical calculation, using the method of image stress and energy study.
The third article presents a study the development of Self Compacting Concrete (SCC) using copper slag (CS) as fine aggregates with partial and full replacement of sand. The authors observed that the fluidity of SCC mixes was significantly enhanced with the increment of copper slag. The results of the tests showed that copper slag has the potential to replace sand in the range of 40-60% to obtain SCC with desirable fresh and strength properties. The use of copper slag (industrial waste) reduces the dosage of superplasticizer, consumption of natural resources which is a solution to decline the cost of concrete and boon for construction industry.
The fourth paper aims to assess geotechnical properties of uncemented/cemented clayey soil incorporated with waste crumb rubber. Authors concluded that unconfined compressive strength and split tensile strength of rubberized cemented clayey soil decreases with the increase of the percentage of crumb rubber whereas the axial, and diametral strain are found to be increased with the addition of crumb rubber up to 5% after that it starts to decrease. The CBR values (California Bearing Ratio), swelling pressure, and toughness index of uncemented/cemented clayey soil was significantly affected by incorporation of crumb rubber.
The fifth paper investigated the effect of fly ash, silica fume and metakaolin on the air permeability of Portland cement concrete at equal water/cement ratios and strengths. At equal water/cement ratios, while fly ash binary cement concretes have higher coefficients of air permeability than Portland cement concrete due to delayed pozzolanic reactivity, silica fume and metakaolin binary cement concretes have comparable coefficients with Portland cement concrete. The ternary cement concretes have coefficients comparable with that of Portland cement concrete. The author concluded that high volume fly ash would be required to increase the resistance of concrete to air permeability at equal strength.
During the first few years of JMES existence, we have tried to respect the regularity in the publication of the issues with a quarterly frequency, and by publishing for each issue a number of articles ranging from four to five with the goal of maintaining a certain level of scientific quality which reflects the ambitions and objectives that JMES has set itself.
At the moment when we are closing this twelfth issue, JMES is being evaluated by two of the most respectable scientific databases which are DAOJ (Directory of Open Access Journals - https://doaj.org) and COMPENDEX (https://www.elsevier.com/solutions/engineering-village/content/compendex). All this would not have been possible without the assistance and the help of expert colleagues, who have done us the honor of evaluating the numerous papers submitted to the JMES during its first three years of existence. We are also taking advantage of this opportunity to renew our confidence in the members of the Reading Committee for the next years.
The journal JMES which is yours continues its reflection on its evolution and aims to position itself as a scientific journal indexed in scientific databases respectable and recognized by the international scientific community. It is in this mind that the Editorial team reiterates its call to all national and foreign researchers to contribute by the quality of their articles to the success of JMES which is theirs and which is a tool for promotion and sharing of their research through their publication.
We wish you a good reading.
Editor in Chief: Dr. Farid ASMA, Senior lecturer, Department of mechanical engineering, University of Mouloud Mammeri, Tizi Ouzou, Algeria
Associate Editor: Dr. Hocine HAMMOUM, Senior lecturer, Department of civil engineering, University of Mouloud Mammeri, Tizi Ouzou, Algeria
Le passage des Maures en Bétique au IIe siècle ap. J.-C
No full textThe author examines the relations between Moorish tribes and Iberian peninsula, reexamining antique sources (epigraphy, littérature) and Muslim chroniques.L'auteur examine les relations entre les Maures et la péninsule Ibérique au travers des sources antiques (épigraphiques et littéraires) et des chroniqueurs musulmans.Rahmoune El Hocine. Le passage des Maures en Bétique au IIe siècle ap. J.-C. In: Antiquités africaines, 37,2001. pp. 105-117
Diagnostic et analyse de risques liés au vieillissement des reservoirs en beton armé : Developpement de methodes d'aide à l'expertise
No full text197 f. ; 30 cm. (+ CD-Rom)La SONADE (SOciété NAtionale de Distribution d’Eau potable), appelée actuellement Algérienne Des Eaux (A.D.E.), a hérité d’un important patrimoine de réservoirs d’eau potable de l’administration coloniale. Par la suite, l’administration centrale par le biais des Directions de l’Hydraulique de Wilaya (DHW) a exécuté un ambitieux programme de réalisation d’ouvrages de stockage dans le cadre du développement local et sectoriel qui se poursuit jusqu’à aujourd’hui. Actuellement, ce patrimoine
n’est plus jeune et l’âge moyen des réservoirs du parc Algérien est d’environ quarante ans.
Par ailleurs, une phase de diagnostic et d’expertise s’est ouverte vers la fin des années 1990, visant à entreprendre des réparations et réhabilitations de ces ouvrages. Cette opération est en cours sur la majeure partie du territoire.
Mon passage de près d’une décennie (1990 à 1999) dans le secteur de l’hydraulique a fait de moi un témoin privilégié de cette phase charnière de diagnostic où il a été beaucoup question de faire le point sur l’état du vieillissement des réservoirs du parc national. Ma qualité d’ingénieur civil dans le domaine de l’hydraulique, durant cette période, m’a permis d’être confronté très tôt aux lacunes du RPA qui n’aborde pas les ouvrages hydrauliques en général et les réservoirs en particulier. Ces lacunes se traduisent plus tard, en phase d’exploitation, par des pathologies très répandues sur le parc Algérien et ce en l’absence
de toute méthodologie et/ou démarche fiable de diagnostic et d‘expertise de ces ouvrages.
Cette thèse s’inscrit clairement dans un environnement pratique de la profession puisqu’elle vient combler les lacunes et insuffisances citées plus haut. Elle a un caractère applicatif de par les propositions très pratiques qu’elle suggère. Elle s’inscrit aussi, dans une démarche de développement durable par le fait qu’elle essaie d’apporter des solutions et méthodes pour identifier les réservoirs vulnérables en vue de rallonger leur vie.
La première méthode proposée est le modèle physique inspiré du modèle hydrodynamique de Housner auquel nous avons adapté le spectre de réponse du RPA. Nous proposons dans la foulée une relation pour le calcul de la période fondamentale d’un réservoir tenant compte de sa rigidité flexionnelle.
La seconde méthode développée est une méthode par expertise qui vise à faire un pré-diagnostic d’un réservoir par une analyse multicritères, inspirée des travaux du Cemagref.
La dernière méthode proposée dite de sureté de fonctionnement appelée AMDEC est empruntée au domaine de l’industrie (nucléaire, aéronautique …) que nous adaptons au génie civil.
Enfin une application informatique basée sur la méthode de l’indice de vulnérabilité est développée. Couplée à un SIG, cette application est un puissant outil d’aide à la décision entre les mains de gestionnaires. Deux parcs de réservoirs ont été expertisés afin de tester cette application informatique
Editorial
No full textThe year 2020 has been a difficult one for most of us; the coronavirus pandemic has not only affected our health and sanity, but has also had a lasting impact on our lives. Now as we enter the year 2021, the Journal of Materials and Engineering Structures (JMES) would like to wish you all a very happy and prosperous New Year. We appreciate the contributions and support from around the world to develop and improve JMES publications. We have received the complete trust and gratitude of the authors in the research communities; we promise to do the best we can not only to maintain the scientific excellence of JMES, but also to continue work to improve the best publication practices.This special issue of Journal of Materials and Engineering Structures (JMES) includes manuscripts of some of the presentations at the third International Conference on Sustainability in Civil Engineering (ICSCE 2020), held during 26-27 November, 2020 at Hanoi, Vietnam. We believe that all the papers published in this special issue will be an opportunity for researchers to present recent works on Sustainability in Civil Engineering field.
Editorial
No full textThe year 2020 has been a difficult one for most of us; the coronavirus pandemic has not only affected our health and sanity, but has also had a lasting impact on our lives. Now as we enter the year 2021, the Journal of Materials and Engineering Structures (JMES) would like to wish you all a very happy and prosperous New Year. We appreciate the contributions and support from around the world to develop and improve JMES publications. We have received the complete trust and gratitude of the authors in the research communities; we promise to do the best we can not only to maintain the scientific excellence of JMES, but also to continue work to improve the best publication practices.This special issue of Journal of Materials and Engineering Structures (JMES) includes manuscripts of some of the presentations at the third International Conference on Sustainability in Civil Engineering (ICSCE 2020), held during 26-27 November, 2020 at Hanoi, Vietnam. We believe that all the papers published in this special issue will be an opportunity for researchers to present recent works on Sustainability in Civil Engineering field.
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