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Satisfaction is a very important factor in improving productivity and performance in the work environment. This study aims to investigate the levels of occupants’ satisfaction with the indoor environmental quality (IEQ) in the governmental buildings in the Kingdom of Bahrain and to investigate the impact of occupants’ demographics and building attributes (non-IEQ factors) on these levels. For these purposes, the study used a questionnaire that has 17 indoor environmental quality (IEQ) factors in addition to a group of non-IEQ factors. The questionnaire was distributed by hand or using email to 279 employees in the Bahraini governmental sector. The findings of the study revealed that occupants in the Bahraini governmental buildings are not strongly satisfied with IEQ factors, especially with sound privacy, followed by visual privacy and amount of space, and then noise levels. The findings also showed that for most IEQ factors, men are more satisfied than women are, those who work in enclosed private offices are more satisfied than those who work in open-plan offices, and those who have central air-conditioning at their workplace are more than those who have a wall-mounted air conditioner. The impact of age, nature of work, duration of working in the current building and at the current workstation, weekly working hours, and proximity to the window were also investigated. Accordingly, a group of recommendations was suggested aiming to improve the levels of occupants’ satisfaction.
Noora Albuainain; Ghaleb Sweis; Wassim AlBalkhy; Rateb Sweis; Zoubeir Lafhaj. Factors Affecting Occupants’ Satisfaction in Governmental Buildings: The Case of the Kingdom of Bahrain. Buildings 2021, 11, 231 .
AMA StyleNoora Albuainain, Ghaleb Sweis, Wassim AlBalkhy, Rateb Sweis, Zoubeir Lafhaj. Factors Affecting Occupants’ Satisfaction in Governmental Buildings: The Case of the Kingdom of Bahrain. Buildings. 2021; 11 (6):231.
Chicago/Turabian StyleNoora Albuainain; Ghaleb Sweis; Wassim AlBalkhy; Rateb Sweis; Zoubeir Lafhaj. 2021. "Factors Affecting Occupants’ Satisfaction in Governmental Buildings: The Case of the Kingdom of Bahrain." Buildings 11, no. 6: 231.
During the last few decades, there has been a greater understanding of the role of lean construction (LC) in achieving better management of construction projects and enabling the application of the fourth industrial revolution in the construction industry (Construction 4.0), which in turn, has the potential to improve the practices and outcomes in the construction industry. This paper aims to identify the barriers to adopt LC practices by taking a case of the Kingdom of Jordan. A questionnaire that included 30 barriers that were resulted from a comprehensive literature review was distributed and filled by 326 respondents from the Jordanian construction industry. The findings showed that the absence of support from the top management, low awareness toward LC, lack of training, and the absence of transparency are amongst the most serious factors that hinder the adoption of LC. The findings in this paper might be helpful to improve the knowledge about LC and support the adoption of new techniques that might improve the performance in the construction industry.
Wassim Al Balkhy; Rateb Sweis; Zoubeir Lafhaj. Barriers to Adopting Lean Construction in the Construction Industry—The Case of Jordan. Buildings 2021, 11, 222 .
AMA StyleWassim Al Balkhy, Rateb Sweis, Zoubeir Lafhaj. Barriers to Adopting Lean Construction in the Construction Industry—The Case of Jordan. Buildings. 2021; 11 (6):222.
Chicago/Turabian StyleWassim Al Balkhy; Rateb Sweis; Zoubeir Lafhaj. 2021. "Barriers to Adopting Lean Construction in the Construction Industry—The Case of Jordan." Buildings 11, no. 6: 222.
This paper investigates the potential for combining robotic and additive manufacturing in construction with geopolymerization. 3D printing is considered an essential element of the new industrial revolution. As a technology that facilitates construction work and minimizes the production line. Geopolymers obtained by alkaline activation of aluminosilicate materials are considered ecological. These materials can help solve the CO2 emission problem and be an effective substitute for building materials due to their mechanical performance and significant durability properties. This study presents a new approach of geopolymer based on clay for 3D printing purpose. Four formulations based on a silicate and sodium hydroxide geopolymer binder were prepared. The silicate to sodium hydroxide ratio was 0.24 and the molarity of NaOH was 10 M. The ratio sand/clay was 1:1. The printability, extrudability and buildability of this new material have been studied. This geopolymer was printed using a robotic arm 3D printer based on the extrusion technique for formulation validation. Mechanical tests for compressive and flexural strength were carried out on the printed geopolymer. The results of this study demonstrate that clay-based geopolymer can replace cement mortar in the 3D printing process with interesting mechanical performance to meet the application requirements in the construction sector.
Nicolas Youssef; Andry Zaid Rabenantoandro; Zoubeir Lafhaj; Zakaria Dakhli; Fadi Hage Chehade; Laure Ducoulombier. A novel approach of geopolymer formulation based on clay for additive manufacturing. Construction Robotics 2021, 5, 175 -190.
AMA StyleNicolas Youssef, Andry Zaid Rabenantoandro, Zoubeir Lafhaj, Zakaria Dakhli, Fadi Hage Chehade, Laure Ducoulombier. A novel approach of geopolymer formulation based on clay for additive manufacturing. Construction Robotics. 2021; 5 (2):175-190.
Chicago/Turabian StyleNicolas Youssef; Andry Zaid Rabenantoandro; Zoubeir Lafhaj; Zakaria Dakhli; Fadi Hage Chehade; Laure Ducoulombier. 2021. "A novel approach of geopolymer formulation based on clay for additive manufacturing." Construction Robotics 5, no. 2: 175-190.
The construction industry represents an important part of the global economy but is known for many issues such as harmful emissions, low productivity, waste generation, poor ergonomics, and construction incidents and accidents. A logistical view has proved to be a solid basis for improving construction performance while construction logistics centres (CLC) are gaining interest and proposing more services such as Kitting. Since the CLC-kitting-based approach is a new phenomenon, it is still a relatively unexplored topic. Hence, this paper addresses how this configuration could be applied to construction projects and what are its related costs information. The research design is based on a single case study showing the CLC-kitting use by a French general contractor in a student housing project. Data has been collected through site visits, observations, project documents, and discussions conducted with construction managers and logistics planners. Data analysis identified realized effects from deploying CLC-kitting in construction projects. Therefore, recommendations are provided, at both strategic and operational levels, which can be leveraged in similar projects. Finally, an identification of constructions logistics costs shows their distribution along the supply chain and was evaluated at 14.7% over material purchasing price.
Soufiane El Moussaoui; Zoubeir Lafhaj; Fernanda Leite; Julien Fléchard; Bruno Linéatte. Construction Logistics Centres Proposing Kitting Service: Organization Analysis and Cost Mapping. Buildings 2021, 11, 105 .
AMA StyleSoufiane El Moussaoui, Zoubeir Lafhaj, Fernanda Leite, Julien Fléchard, Bruno Linéatte. Construction Logistics Centres Proposing Kitting Service: Organization Analysis and Cost Mapping. Buildings. 2021; 11 (3):105.
Chicago/Turabian StyleSoufiane El Moussaoui; Zoubeir Lafhaj; Fernanda Leite; Julien Fléchard; Bruno Linéatte. 2021. "Construction Logistics Centres Proposing Kitting Service: Organization Analysis and Cost Mapping." Buildings 11, no. 3: 105.
The operation and maintenance of buildings has seen several advances in recent years. Multiple information and communication technology (ICT) solutions have been introduced to better manage building maintenance. However, maintenance practices in buildings remain less efficient and lead to significant energy waste. In this paper, a predictive maintenance framework based on machine learning techniques is proposed. This framework aims to provide guidelines to implement predictive maintenance for building installations. The framework is organised into five steps: data collection, data processing, model development, fault notification and model improvement. A sport facility was selected as a case study in this work to demonstrate the framework. Data were collected from different heating ventilation and air conditioning (HVAC) installations using Internet of Things (IoT) devices and a building automation system (BAS). Then, a deep learning model was used to predict failures. The case study showed the potential of this framework to predict failures. However, multiple obstacles and barriers were observed related to data availability and feedback collection. The overall results of this paper can help to provide guidelines for scientists and practitioners to implement predictive maintenance approaches in buildings.
Yassine Bouabdallaoui; Zoubeir Lafhaj; Pascal Yim; Laure Ducoulombier; Belkacem Bennadji. Predictive Maintenance in Building Facilities: A Machine Learning-Based Approach. Sensors 2021, 21, 1044 .
AMA StyleYassine Bouabdallaoui, Zoubeir Lafhaj, Pascal Yim, Laure Ducoulombier, Belkacem Bennadji. Predictive Maintenance in Building Facilities: A Machine Learning-Based Approach. Sensors. 2021; 21 (4):1044.
Chicago/Turabian StyleYassine Bouabdallaoui; Zoubeir Lafhaj; Pascal Yim; Laure Ducoulombier; Belkacem Bennadji. 2021. "Predictive Maintenance in Building Facilities: A Machine Learning-Based Approach." Sensors 21, no. 4: 1044.
This article proposes a methodology to measure the productivity of a construction site through the analysis of tower crane data. These data were obtained from a data logger that records a time series of spatial and load data from the lifting machine during the structural phase of a construction project. The first step was data collection, followed by preparation, which consisted of formatting and cleaning the dataset. Then, a visualization step identified which data was the most meaningful for the practitioners. From that, the activity of the tower crane was measured by extracting effective lifting operations using the load signal essentially. Having used such a sampling technique allows statistical analysis on the duration, load, and curvilinear distance of every extracted lifting operation. The build statistical distribution and indicators were finally used to compare construction site productivity.
Thomas Danel; Zoubeir Lafhaj; Anand Puppala; Sophie Lienard; Philippe Richard. Proposal for Tower Crane Productivity Indicators Based on Data Analysis in the Era of Construction 4.0. Buildings 2021, 11, 21 .
AMA StyleThomas Danel, Zoubeir Lafhaj, Anand Puppala, Sophie Lienard, Philippe Richard. Proposal for Tower Crane Productivity Indicators Based on Data Analysis in the Era of Construction 4.0. Buildings. 2021; 11 (1):21.
Chicago/Turabian StyleThomas Danel; Zoubeir Lafhaj; Anand Puppala; Sophie Lienard; Philippe Richard. 2021. "Proposal for Tower Crane Productivity Indicators Based on Data Analysis in the Era of Construction 4.0." Buildings 11, no. 1: 21.
This paper presents an economic analysis of manufacturing geopolymer bricks for use in the construction sector. The manufacturing processes of both geopolymer bricks and traditional fired bricks were investigated. For this study, we collected and analyzed all phases of geopolymer brick production from the extraction of raw materials to storage. Seven formulations of geopolymer bricks based on clay and waste bricks were analyzed. We considered the cost of raw materials and logistics operations in the production line of brick manufacturing. The results of this study prove that the manufacturing cost of geopolymer bricks based on clay provides an economic gain of 5% compared to fired bricks for the same compressive strength of 20 MPa. In the case of waste bricks, for the same production cost, the compressive strength of the geopolymer bricks is double that of fired bricks. Hence, this study shows the economic interest in the industrial production of geopolymer bricks. It also confirms that future research is needed that focuses on necessary changes to the current industrial production chain required for the manufacture of geopolymer bricks.
Nicolas Youssef; Zoubeir Lafhaj; Christophe Chapiseau. Economic Analysis of Geopolymer Brick Manufacturing: A French Case Study. Sustainability 2020, 12, 7403 .
AMA StyleNicolas Youssef, Zoubeir Lafhaj, Christophe Chapiseau. Economic Analysis of Geopolymer Brick Manufacturing: A French Case Study. Sustainability. 2020; 12 (18):7403.
Chicago/Turabian StyleNicolas Youssef; Zoubeir Lafhaj; Christophe Chapiseau. 2020. "Economic Analysis of Geopolymer Brick Manufacturing: A French Case Study." Sustainability 12, no. 18: 7403.
In recent years, facility management (FM) has adopted many computer technology solutions for building maintenance, such as building information modelling (BIM) and computerized maintenance management systems (CMMS). However, maintenance requests management in buildings remains a manual and a time-consuming process that depends on human management. In this paper, a machine-learning algorithm based on natural language processing (NLP) is proposed to classify maintenance requests. This algorithm aims to assist the FM teams in managing day-to-day maintenance activities. A healthcare facility is addressed as a case study in this work. Ten-year maintenance records from the facility contributed to the design and development of the algorithm. Multiple NLP methods were used in this study, and the results reveal that the NLP model can classify work requests with an average accuracy of 78%. Furthermore, NLP methods have proven to be effective for managing unstructured text data.
Yassine Bouabdallaoui; Zoubeir Lafhaj; Pascal Yim; Laure Ducoulombier; Belkacem Bennadji. Natural Language Processing Model for Managing Maintenance Requests in Buildings. Buildings 2020, 10, 160 .
AMA StyleYassine Bouabdallaoui, Zoubeir Lafhaj, Pascal Yim, Laure Ducoulombier, Belkacem Bennadji. Natural Language Processing Model for Managing Maintenance Requests in Buildings. Buildings. 2020; 10 (9):160.
Chicago/Turabian StyleYassine Bouabdallaoui; Zoubeir Lafhaj; Pascal Yim; Laure Ducoulombier; Belkacem Bennadji. 2020. "Natural Language Processing Model for Managing Maintenance Requests in Buildings." Buildings 10, no. 9: 160.
The objective of this paper is to propose a pre-experimental framework of printability pre-assessment of cementitious materials. This study firstly presents a general review of additive manufacturing in construction and then examines the main characteristic of the material formulation and printability properties based on extrusion technique. This framework comes with experimental tests to determine a qualitative printability index of mixtures. It uses mix-designs reported in the literature to define interval ratio of mixture design to be investigated in this study. The focus was put on two criteria that influence the formulation namely flowability and buildability. Two practiced based tests, mini slump and cone penetrometer, were used to draw the flowability and buildability dimensionless index. The results were analyzed by introducing an optimal printability coefficient and examining their time evolution. An optimal time of printing was determined Toptimal. Finally, a 3D mortar printing system and its operational process are presented. Then, based on the measurement, the optimal mixture is identified and printed in a large-scale geometry.
Zoubeir Lafhaj; Andry Zaid Rabenantoandro; Soufiane El Moussaoui; Zakaria Dakhli; Nicolas Youssef. Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials. Buildings 2019, 9, 245 .
AMA StyleZoubeir Lafhaj, Andry Zaid Rabenantoandro, Soufiane El Moussaoui, Zakaria Dakhli, Nicolas Youssef. Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials. Buildings. 2019; 9 (12):245.
Chicago/Turabian StyleZoubeir Lafhaj; Andry Zaid Rabenantoandro; Soufiane El Moussaoui; Zakaria Dakhli; Nicolas Youssef. 2019. "Experimental Approach for Printability Assessment: Toward a Practical Decision-Making Framework of Printability for Cementitious Materials." Buildings 9, no. 12: 245.
In this study, the potential for reuse of waste brick (WB) by alkaline activation in a new geopolymer brick was examined. The effect of the incorporation of ground granulate blast furnace slag (GGBFS), the molarity of sodium hydroxide (NaOH) and the silicate to sodium hydroxide ratio (Na2SiO3/NaOH) on the mechanical properties of the final product was investigated. The manufacturing of geopolymer bricks was carried out by mixing WBs, GGBFS, sand with a solution of hydroxide and sodium silicate. The samples were prepared according to different formulations. The optimal compressive strength obtained is 89.91 MPa, for a GGBFS/WB ratio of 80/20, an 8 M molarity of NaOH and a silicate/hydroxide ratio of 2/1. This study shows an effective feasibility for the recovery and recycling of industrial waste into a valuable product for the construction sector. This recycling method can bring environmental and economic benefits by using it as an alternative material to fired brick in construction. Given the results obtained, it will be interesting to study the environmental and economic impact as well as the durability properties of these geopolymer bricks.
Nicolas Youssef; Andry Zaid Rabenantoandro; Zakaria Dakhli; Christophe Chapiseau; François Waendendries; Fadi Hage Chehade; Zoubeir Lafhaj. Reuse of waste bricks: a new generation of geopolymer bricks. SN Applied Sciences 2019, 1, 1252 .
AMA StyleNicolas Youssef, Andry Zaid Rabenantoandro, Zakaria Dakhli, Christophe Chapiseau, François Waendendries, Fadi Hage Chehade, Zoubeir Lafhaj. Reuse of waste bricks: a new generation of geopolymer bricks. SN Applied Sciences. 2019; 1 (10):1252.
Chicago/Turabian StyleNicolas Youssef; Andry Zaid Rabenantoandro; Zakaria Dakhli; Christophe Chapiseau; François Waendendries; Fadi Hage Chehade; Zoubeir Lafhaj. 2019. "Reuse of waste bricks: a new generation of geopolymer bricks." SN Applied Sciences 1, no. 10: 1252.
The intensity and rate of construction operations require logistics and transportation that can adapt to the changing nature of activities on a day-to-day basis of construction and that enable rapid decision-making. This paper aims to design an integrated RFID technology system for managing construction materials onsite. The integration includes managing materials during the front-end and the execution phases, managing the inventory, locating materials on site with Global Positioning System GPS, and developing Kanban systems for managing different stakeholders’ inputs onsite. The research also sheds the light into the effect of using RFID on leveraging valuable data. RFID systems can gather large amount of tag data via wireless connections.
Safa Dardouri; Zakaria Dakhli; Andry Zaid Rabenantoandro; Zoubeir Lafhaj. RFID-Integrated Software Platform for Construction Materials Management. Modular and Offsite Construction (MOC) Summit Proceedings 2019, 479 -487.
AMA StyleSafa Dardouri, Zakaria Dakhli, Andry Zaid Rabenantoandro, Zoubeir Lafhaj. RFID-Integrated Software Platform for Construction Materials Management. Modular and Offsite Construction (MOC) Summit Proceedings. 2019; ():479-487.
Chicago/Turabian StyleSafa Dardouri; Zakaria Dakhli; Andry Zaid Rabenantoandro; Zoubeir Lafhaj. 2019. "RFID-Integrated Software Platform for Construction Materials Management." Modular and Offsite Construction (MOC) Summit Proceedings , no. : 479-487.
This study is based on the following observation: there is a significant difference between the initial budget forecast and the final budget of construction project. Cost differences in construction projects between the first estimate made by the engagement committee and the actual construction cost at the end of the project are highlighted. Our study therefore focuses on indicators that track the overall cost of a construction project from the client's perspective, in this case the real estate development company. The objectives are as follow: Highlight cost variances in construction projects and analyze the gaps between the initial cost design by customer and final construction. The waste between the "design", “marketing” and "construction" phases is discussed. The paper also quantifies waste in terms of cost between the phases. The analysis reveal that the overall cost evolution is 2.59%, with 0.89% coming from the Construction phase and 1.72% from the Marketing phase, and 0.09% from the Design phase. The results could be of interest to a wide range of researchers working on the interface between the design and construction phases.
Zakaria Dakhli; Zoubeir Lafhaj. Cost Evolution Throughout the Construction Value Chain. Modular and Offsite Construction (MOC) Summit Proceedings 2019, 33 -40.
AMA StyleZakaria Dakhli, Zoubeir Lafhaj. Cost Evolution Throughout the Construction Value Chain. Modular and Offsite Construction (MOC) Summit Proceedings. 2019; ():33-40.
Chicago/Turabian StyleZakaria Dakhli; Zoubeir Lafhaj. 2019. "Cost Evolution Throughout the Construction Value Chain." Modular and Offsite Construction (MOC) Summit Proceedings , no. : 33-40.
This paper provides a design of the Information System architecture to support a connected construction site. In order to master the diversity and the complexity of construction site processes, theories are needed that separate the stable essence of the smart construction site from the variable way in which it is realized and implemented. For that, construction site processes were mapped before linking each data path with the existing technological tools using correspondence matrixes. The results enable the definition of a proper system able to deal with the resources allocated to the construction process functionalities. The main challenge faced in this research was to identify which pertinent data is needed that activates the resources to complete each given construction task.
Zakaria Dakhli; Thomas Danel; Zoubeir Lafhaj. Smart Construction Site: Ontology of Information System Architecture. Modular and Offsite Construction (MOC) Summit Proceedings 2019, 41 -50.
AMA StyleZakaria Dakhli, Thomas Danel, Zoubeir Lafhaj. Smart Construction Site: Ontology of Information System Architecture. Modular and Offsite Construction (MOC) Summit Proceedings. 2019; ():41-50.
Chicago/Turabian StyleZakaria Dakhli; Thomas Danel; Zoubeir Lafhaj. 2019. "Smart Construction Site: Ontology of Information System Architecture." Modular and Offsite Construction (MOC) Summit Proceedings , no. : 41-50.
When focusing on materials science in civil engineering, the current trend is to investigate the use of innovative solutions in order to enhance thermal and energy performances. This trend is amplified with the need for a sustainable development strategy for the construction sector. This paper assesses the integration of a Phase Change Material (PCM) in cement intended for building construction. The key characteristic of PCMs is their capacity to absorb energy and restore it. In building construction, this feature could be harnessed to save energy by incorporating PCMs in the materials used. In this study, passive integration of PCM in cement was tested and thermal properties of such an integration was assessed. The results provide insights into how PCMs affect cement as part of the concrete mixture, thus identifying the contribution of PCM-based cements in concrete mixtures.
Zakaria Dakhli; Khaled Chaffar; Zoubeir Lafhaj. The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement. Sci 2019, 1, 27 .
AMA StyleZakaria Dakhli, Khaled Chaffar, Zoubeir Lafhaj. The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement. Sci. 2019; 1 (1):27.
Chicago/Turabian StyleZakaria Dakhli; Khaled Chaffar; Zoubeir Lafhaj. 2019. "The Effect of Phase Change Materials on the Physical, Thermal and Mechanical Properties of Cement." Sci 1, no. 1: 27.
Studying the durability of materials and structures, including 3D-printed structures, is now a key step in better meeting the challenges of sustainable development and integrating technical and economic aspects from the design phase into the execution phase. While digital and robotics technologies have been well developed for construction 3D printing, the material aspect still faces critical issues to meet the evolving requirements for buildings. This research aims to develop performance indicators for 3D-printed materials used in construction regardless of the nature of the material. A general guideline is to be established as a result of this research. Thus, the literature review analyzes traditional durability approaches to construction materials and challenges are identified for potential applications in construction. The results suggest that performance indicators for 3D-printed materials should be checked as printable through an experimental case study. This research could be of interest to researchers, professionals, and start-ups in the construction and materials research fields.
Zoubeir Lafhaj; Zakaria Dakhli. Performance Indicators of Printed Construction Materials: a Durability-Based Approach. Buildings 2019, 9, 97 .
AMA StyleZoubeir Lafhaj, Zakaria Dakhli. Performance Indicators of Printed Construction Materials: a Durability-Based Approach. Buildings. 2019; 9 (4):97.
Chicago/Turabian StyleZoubeir Lafhaj; Zakaria Dakhli. 2019. "Performance Indicators of Printed Construction Materials: a Durability-Based Approach." Buildings 9, no. 4: 97.
Construction customers want more complex facilities delivered faster and at a lower cost. Transaction costs account for a significant proportion of each new or refurbished facility (a 2017 report from the Infrastructure Client Group in the UK suggests as high as 50%), yet they contribute no value to the customer. Blockchain is being suggested as a way to reduce transaction costs by eliminating the need for intermediaries to build trust as a prerequisite for successfully executed agreements. This study first describes the thinking that underpins blockchain technology, outlining how it works, and the potential limitations of the technology. Second, using a case study, reviews the potential cost savings from the use of blockchain for a real estate company. The results reveal a potential cost savings from blockchain deployment at 8.3% of the total cost of residential construction, with a standard deviation of 1.26%. Third, we explore the implications, risks and applications of blockchain technology for improving flow in the end-to-end design and construction process and we identify opportunities for future research on blockchain applications in construction.
Zakaria Dakhli; Zoubeir Lafhaj; Alan Mossman. The Potential of Blockchain in Building Construction. Buildings 2019, 9, 77 .
AMA StyleZakaria Dakhli, Zoubeir Lafhaj, Alan Mossman. The Potential of Blockchain in Building Construction. Buildings. 2019; 9 (4):77.
Chicago/Turabian StyleZakaria Dakhli; Zoubeir Lafhaj; Alan Mossman. 2019. "The Potential of Blockchain in Building Construction." Buildings 9, no. 4: 77.
Tadesse Ayalew; Zakaria Dakhli; Zoubeir Lafhaj. Characterization of Waste in Ethiopian Building Construction Projects. 26th Annual Conference of the International Group for Lean Construction 2018, 797 -806.
AMA StyleTadesse Ayalew, Zakaria Dakhli, Zoubeir Lafhaj. Characterization of Waste in Ethiopian Building Construction Projects. 26th Annual Conference of the International Group for Lean Construction. 2018; ():797-806.
Chicago/Turabian StyleTadesse Ayalew; Zakaria Dakhli; Zoubeir Lafhaj. 2018. "Characterization of Waste in Ethiopian Building Construction Projects." 26th Annual Conference of the International Group for Lean Construction , no. : 797-806.
While materials count for a considerable amount of construction costs, the way materials are managed seems to be improvised rather than approached methodically. This study investigates the practice of novel techniques used to manage materials in the construction industry. Techniques that have already proven themselves to be efficient ways to manage the production pace within the industry include the pull system, Just-In-Time, Kitting and off-site fabrication. These are explained and assessed in the context of the French construction industry through an exploratory study, supported by a questionnaire completed by contractors. The results reveal that a clear plan to manage materials on-site is lacking among the respondents, creating common inventory problems. This research provides evidence to support the central role played by an efficient management of material flow on-site. It also highlights the obstacles that hinder the adoption of innovative techniques, such as sub-contractor coordination.
Zakaria Dakhli; Zoubeir Lafhaj. Considering Materials Management in Construction: An Exploratory Study. Logistics 2018, 2, 7 .
AMA StyleZakaria Dakhli, Zoubeir Lafhaj. Considering Materials Management in Construction: An Exploratory Study. Logistics. 2018; 2 (1):7.
Chicago/Turabian StyleZakaria Dakhli; Zoubeir Lafhaj. 2018. "Considering Materials Management in Construction: An Exploratory Study." Logistics 2, no. 1: 7.
This study focuses on the feasibility of sediment reuse as new road material. Experimentations were conducted to point out sediment reuse as road material. Three mixtures (Raw sediments, Stabilized Sediments with 3% lime (SS-3L) and Stabilized Sediments with 3% cement (SS-3C)) were studied regarding their mechanical performances. The first part introduces the characterization of Zarzis sediments. The second part describes the laboratory experiments and the followed methods. The third part is dedicated to the results analysis. The originality of this work is the use of a minimum percentage of lime, which was determined experimentally. Based on environmental tests, Zarzis sediments were uncontaminated. Thus, they can be reused directly without a decontamination treatment process. Results showed that humic compounds complicated sediments treatment with cement. Therefore, cement did not present an appropriate binder to stabilize and solidify investigated sediments. Based on mechanical results mixture with 3% lime can be used as new road material.
Marwa Zelleg; Imen Said; Essaieb Hamdi; Zoubeir Lafhaj. Experimental testing for Zarzis port sediments (Tunisia) in road materials. Geotechnical Research 2018, 5, 13 -21.
AMA StyleMarwa Zelleg, Imen Said, Essaieb Hamdi, Zoubeir Lafhaj. Experimental testing for Zarzis port sediments (Tunisia) in road materials. Geotechnical Research. 2018; 5 (1):13-21.
Chicago/Turabian StyleMarwa Zelleg; Imen Said; Essaieb Hamdi; Zoubeir Lafhaj. 2018. "Experimental testing for Zarzis port sediments (Tunisia) in road materials." Geotechnical Research 5, no. 1: 13-21.
While logistics comprises an important part of tunneling costs, it is generally not considered a lever of performance but rather a constraint to a project's progress. This study presents some insights on how smart technology can impact the tunneling industry. The impact is even greater because of the complexity of the tunneling supply chain, and smart technology could help support this process. Finally, we discuss how the nature of the tunneling industry invites stakeholders to develop a common understanding of the project prior to construction to successfully deploy smart technology during the use or maintenance phase.
Zakaria Dakhli; Zoubeir Lafhaj. Efficient logistics enabled by smart solutions in tunneling. Underground Space 2017, 2, 227 -233.
AMA StyleZakaria Dakhli, Zoubeir Lafhaj. Efficient logistics enabled by smart solutions in tunneling. Underground Space. 2017; 2 (4):227-233.
Chicago/Turabian StyleZakaria Dakhli; Zoubeir Lafhaj. 2017. "Efficient logistics enabled by smart solutions in tunneling." Underground Space 2, no. 4: 227-233.