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Papers by cherkaoui khalid

Http Www Theses Fr, Oct 15, 2010

Les Betons de Poudre Reactive (BPR) sont connus pour leur resistance tres elevee et leur bonne du... more Les Betons de Poudre Reactive (BPR) sont connus pour leur resistance tres elevee et leur bonne durabilite, mais aussi pour leur prix eleve. L’objectif de cette etude concerne la mise au point d’une formulation de BPR extrudable (BPR). Des essais preliminaires d’ecoulement au mini cone d’Abrams ont ete realises avec des teneurs variees en superplastifiant et en substituant partiellement la fumee de silice par du quartz broye. Cinq melanges ont ete retenus et caracterises de facon systematique au microscope electronique a balayage et en diffraction des Rayons X. Une etude complete de retrait au jeune âge, de resistance mecanique et de durabilite face a l’azote et aux ions chlorure a ete menee. Un montage experimental d’extrusion a ete mis au point. Un melange incorporant du quartz broye en remplacement d’une fraction de la fumee de silice et une composition optimisee en superplastifiant montre des proprietes interessantes : extrudabilite, tres bonne durabilite, performances mecaniques ameliorees et retrait diminue. Sur cette composition, l’etude microstructurale met en evidence le role que joue le superplastifiant sur la chimie d’hydratation avec une forte consommation en belite. Ce melange permet ainsi de diminuer le cout de fabrication pour un BPR en permettant d’economiser la fumee de silice couteuse et en ne necessitant aucun traitement thermique.

Construction and Building Materials, 2019

Cleaner Engineering and Technology, 2021

Abstract Sludge disposal has major drawbacks on the environment when damping wastewater treatment... more Abstract Sludge disposal has major drawbacks on the environment when damping wastewater treatment sludge in landfills and estuaries. In addition to financial drawbacks manifested by the poor sludge management due to the lack of valorization regulations or investments’ encouragement. This paper analyzes the mechanical, physicochemical, and thermal properties of earth bricks of unfired type thanks to their low energy demand and high energy savings’ potential. This enables promoting a cleaner production protocol in accordance to the Moroccan testing standards in the building sector. X-ray Diffraction and Fluorescence analysis of the earth and sludge deployed reflected a dominance in Quartz (SiO2) with a respective 59.6% and 28.37%. This affirms the high clayey composition in the used earth material. Various sludge additive percentages (0%, 1%, 3%, 7%, 15% and 20%) to earth material, by weight, are investigated. Higher sludge content in the brick samples’ matrix produced more porous specimens, up to 17%, compared to control samples, of 0% additive content, with 1.04% porosity level. This resulted in higher capillary water absorption coefficient 47.15 ​g/(cm2.min0.5) and lower compressive strength 3.95 ​MPa compared to reference values, of 0% additive, of 25.10 ​g/(cm2.min0.5) and 6.17 ​MPa, respectively. In addition, bulk density analysis classified produced brick samples as lightweight construction materials, following the Moroccan testing standards. This is due to specimens’ respective bulk density does not go beyond the 1.75 ​g/cm3 mark. Improvements in thermal performance were also recorded with 43% and 30% gains in thermal conductivity and specific heat capacity properties, respectively, compared to control samples. Moreover, the incorporation of sludge additive into the clayey earth matrix has shown a decrease in the mixtures’ pH level. This resulted in producing more porous brick samples with improved thermal properties and lower mechanical compressive strength due to deterioration.

2019 7th International Renewable and Sustainable Energy Conference (IRSEC), 2019

Construction industry is and has always been a flourishing industry in the whole world. Today, wi... more Construction industry is and has always been a flourishing industry in the whole world. Today, with the global development especially in technology, real estate construction is growing more than ever and is continuously using new techniques and methods. However, cost remains a big challenge specially to developing and under developed countries where people in urban as in rural areas can't afford expensive materials and construction methods to build their own houses with. As a result, companies in the construction industry are highly competing, and several researches are being held in this field in order to find the best and most cost and energy efficient building materials and techniques. In the first part of this paper, unfired clay bricks samples were prepared using three type of additives: Palm fronds, date pits and limestone, with different percentages. The mechanical properties, illustrated in compressive and flexural strength, were reviewed, to then suggest recommendations as the outcome of the study. It was found that date pits are the most preferable additive to strengthen unfired clay bricks. In the second part, a mechanical simulation for perforated bricks was done in SolidWorks software to analyze the effect of the number of holes and their distribution on the mechanical properties of the brick.

Construction and Building Materials, 2016

Procedia Structural Integrity

Http Www Theses Fr, Oct 15, 2010

Les Betons de Poudre Reactive (BPR) sont connus pour leur resistance tres elevee et leur bonne du... more Les Betons de Poudre Reactive (BPR) sont connus pour leur resistance tres elevee et leur bonne durabilite, mais aussi pour leur prix eleve. L’objectif de cette etude concerne la mise au point d’une formulation de BPR extrudable (BPR). Des essais preliminaires d’ecoulement au mini cone d’Abrams ont ete realises avec des teneurs variees en superplastifiant et en substituant partiellement la fumee de silice par du quartz broye. Cinq melanges ont ete retenus et caracterises de facon systematique au microscope electronique a balayage et en diffraction des Rayons X. Une etude complete de retrait au jeune âge, de resistance mecanique et de durabilite face a l’azote et aux ions chlorure a ete menee. Un montage experimental d’extrusion a ete mis au point. Un melange incorporant du quartz broye en remplacement d’une fraction de la fumee de silice et une composition optimisee en superplastifiant montre des proprietes interessantes : extrudabilite, tres bonne durabilite, performances mecaniques ameliorees et retrait diminue. Sur cette composition, l’etude microstructurale met en evidence le role que joue le superplastifiant sur la chimie d’hydratation avec une forte consommation en belite. Ce melange permet ainsi de diminuer le cout de fabrication pour un BPR en permettant d’economiser la fumee de silice couteuse et en ne necessitant aucun traitement thermique.

Construction and Building Materials, 2019

Cleaner Engineering and Technology, 2021

Abstract Sludge disposal has major drawbacks on the environment when damping wastewater treatment... more Abstract Sludge disposal has major drawbacks on the environment when damping wastewater treatment sludge in landfills and estuaries. In addition to financial drawbacks manifested by the poor sludge management due to the lack of valorization regulations or investments’ encouragement. This paper analyzes the mechanical, physicochemical, and thermal properties of earth bricks of unfired type thanks to their low energy demand and high energy savings’ potential. This enables promoting a cleaner production protocol in accordance to the Moroccan testing standards in the building sector. X-ray Diffraction and Fluorescence analysis of the earth and sludge deployed reflected a dominance in Quartz (SiO2) with a respective 59.6% and 28.37%. This affirms the high clayey composition in the used earth material. Various sludge additive percentages (0%, 1%, 3%, 7%, 15% and 20%) to earth material, by weight, are investigated. Higher sludge content in the brick samples’ matrix produced more porous specimens, up to 17%, compared to control samples, of 0% additive content, with 1.04% porosity level. This resulted in higher capillary water absorption coefficient 47.15 ​g/(cm2.min0.5) and lower compressive strength 3.95 ​MPa compared to reference values, of 0% additive, of 25.10 ​g/(cm2.min0.5) and 6.17 ​MPa, respectively. In addition, bulk density analysis classified produced brick samples as lightweight construction materials, following the Moroccan testing standards. This is due to specimens’ respective bulk density does not go beyond the 1.75 ​g/cm3 mark. Improvements in thermal performance were also recorded with 43% and 30% gains in thermal conductivity and specific heat capacity properties, respectively, compared to control samples. Moreover, the incorporation of sludge additive into the clayey earth matrix has shown a decrease in the mixtures’ pH level. This resulted in producing more porous brick samples with improved thermal properties and lower mechanical compressive strength due to deterioration.

2019 7th International Renewable and Sustainable Energy Conference (IRSEC), 2019

Construction industry is and has always been a flourishing industry in the whole world. Today, wi... more Construction industry is and has always been a flourishing industry in the whole world. Today, with the global development especially in technology, real estate construction is growing more than ever and is continuously using new techniques and methods. However, cost remains a big challenge specially to developing and under developed countries where people in urban as in rural areas can't afford expensive materials and construction methods to build their own houses with. As a result, companies in the construction industry are highly competing, and several researches are being held in this field in order to find the best and most cost and energy efficient building materials and techniques. In the first part of this paper, unfired clay bricks samples were prepared using three type of additives: Palm fronds, date pits and limestone, with different percentages. The mechanical properties, illustrated in compressive and flexural strength, were reviewed, to then suggest recommendations as the outcome of the study. It was found that date pits are the most preferable additive to strengthen unfired clay bricks. In the second part, a mechanical simulation for perforated bricks was done in SolidWorks software to analyze the effect of the number of holes and their distribution on the mechanical properties of the brick.

Construction and Building Materials, 2016

Procedia Structural Integrity