Dr. Ibrahim Mahdi is a Professor of Project Management at the Future University in Egypt. He received his Ph.D. from University of Southampton, England UK. Dr. Mahdi has over 30 years of professional experience in all project management aspects including Planning
Earned value management (EVM) is a project performance evaluation technique that has beenoriginat... more Earned value management (EVM) is a project performance evaluation technique that has beenoriginated in industrial engineering.During the constructionphase, EVM implementation is facing some problems that may diminish the effectiveness of using earned value as a control technique for the project. The objective of this research is to identify and analyze thesedifficulties. Earned value analysis (EVA) is implemented on two different construction projects showing the effect of these difficulties on EVA results.A structured questionnaire and interviews were done for this objective.Their analysis illustrated that the technical problems mainly affect project's time control, while the project's cost control is affected mainly by the financial problems.There are some problems facing the actual cost recording that may impede the implementation of EV as a control technique
Abstract Portal frame systems are widely used as coverage system in industrial projects. Selectin... more Abstract Portal frame systems are widely used as coverage system in industrial projects. Selecting the proper portal frame system for a certain project depends on many technical, financial and logistical factors such as estimated cost, construction duration, availability of materials, equipment and skilled labor, besides environmental factors such as recycling and durability. The aim of this research is to create a Decision Support System (DSS) to decide the optimal portal frame system considering all these factors. The proposed (DSS) depends on integrating the Value Engineering (VE) concept with the Analytical Hierarchy Process (AHP) technique to identify the optimum system. The considered systems in this research are conventional portal made of hot rolled section, pre-engineered built-up portal frame, trussed frames and portal Frame truss. The developed (DSS) was tuned for the current Egyptian market conditions in 2019 and successfully verified using four selected projects with different height to span ratio.
These instructions provide you guidelines for preparing papers for International Journal of Appli... more These instructions provide you guidelines for preparing papers for International Journal of Application or Innovation in Cantilevered sheet pile walls are commonly used in shoring systems of deep excavation down to about 5.00 m. The most common design procedure for this type of flexible retaining structures is to determine the required penetration depth for stability and then increasing the calculated penetration depth by 20% to 40% to achieve a factor of safety of about 1.5 to 2.0. This procedure has two disadvantages; first, the procedure does not give accurate values for penetration depth or corresponding factor of safety, second, it ignores the effect of uncertainty in the used geotechnical parameters. The first aim of this study is to overcome those two disadvantages by introduce an alternative formula to determine the optimum penetration depth of cantilever sheet pile walls in dry granular soil based on reliability analysis concept, while, the second aim is to study the impact...
Abstract Reinforced concrete multi-story buildings are commonly used in residential, commercial, ... more Abstract Reinforced concrete multi-story buildings are commonly used in residential, commercial, and administrative projects; therefore, selecting the optimum structural system with minimum cost is the top priority of the structural designer. Although earlier researches intensively studied this issue, it is still not completely covered. This research aims to introduce recommendations for the optimum gravity and lateral systems for a multi-story reinforced concrete (RC) building from a perspective of direct cost. In order to achieve that goal, a parametric study was carried out using 72 RC buildings with several stories ranged between 5 and 50 floors, and grid spacing ranged between 6.0 and 12.0 m. Four floor systems were considered, solid, 2 ways ribbed, waffle, and flat slabs. Also, three lateral loads resisting systems were considered which are intermediate moment resisting frames, shear walls, and a dual system. The study covered the low, medium and high rise buildings. The results indicated that the dual system is the most suitable system for medium and high rise buildings with combination with solid slabs for short spans and ribbed slabs for medium and long spans. On the other hand, frame with solid slabs is the optimum for low rise with short spans and shear wall with the flat slab is the optimum for low rise with medium and long spans.
ABSTRACT: Value Engineering (VE) concept does not mean a cost reduction only, but it extends beyo... more ABSTRACT: Value Engineering (VE) concept does not mean a cost reduction only, but it extends beyond. VE is a powerful problem-solving tool that can reduce costs while maintaining or improving performance and quality requirements. It's a function-oriented, systematic team approach to providing value in a product or service. Construction project as a product or service is generally considered to have good value if this product or service has appropriate performance and cost. The construction product's characteristics differ than those in manufacture in many aspects such as immobility, complexity, durability, cost lines, and high degree of social responsibility. These characteristics are highly affected by the construction technology. Where, adopting these new technologies and working method in proper work environment can maximize the product with a working time reduction by 25% and cost reduction by 20% in average. Slip Form (S.F) is considered one of these common methods of...
International Journal of Construction Engineering and Management, 2018
Purpose – Construction labor productivity in bridges of great interest to practitioners and resea... more Purpose – Construction labor productivity in bridges of great interest to practitioners and researchers because it affects project cost and time overrun. This paper evaluates and ranks the importance, frequency and severity of project delay factors that affect the construction labor productivity for construction of Pre-stressed concrete bridges. Design/erection / methodology: A total of 50 respondents consisting of owners contractors, and consulting participated in this study. The respondents were asked to indicate how important each item of a list of many bridges project related factors was to construction labor productivity for construction of Pre-stressed concrete bridges. The data were then subjected to the calculation of important indices which enabled the factors to be ranked. Findings: The eleven most important factors identified by them were: design factor, equipment factor, execution and construction factor, external factor, financial factor, healthy and safety factor, labo...
Bridges represent a significant percentage of the economy of many countries. They are a vital com... more Bridges represent a significant percentage of the economy of many countries. They are a vital component of the country's road and highway network. Bridges are subjected to harsh environmental conditions throughout their service-life and consequently structural deterioration occurs. Asset managers are required to maintain networks in good service conditions and; in many cases with limited funds. The objective of this research is to develop a decision support system (DSS) for concrete bridges that provides assistance to the decision maker in evaluating and prioritizing the maintenance strategy of bridges. Thus, the decision maker can identify the urgency level of repair and select the optimal maintenance plan, either for a network of bridges, or on a single level, taking budget limitations into consideration. A comprehensive survey was conducted for data collection in order to build the system's database. This database includes different factors which are incorporated into the...
A computer-based systematic approach for optimizing material cost in reinforced concrete elements... more A computer-based systematic approach for optimizing material cost in reinforced concrete elements is presented. This approach considers the current material cost in the trade-off and selection of member dimensions and reinforcement design of concrete elements such as beams and columns. The theoretical framework is to design reinforced concrete structure based on the cost of available materials and not just on the availability of materials. The windows-oriented computer program developed for this purpose would also be beneficial to owners, designers and contractors interested in cost optimization of reinforced concrete elements.
Infrastructure projects are crucial to the economy of any country, especially developing ones suc... more Infrastructure projects are crucial to the economy of any country, especially developing ones such as Egypt and most African countries. According to the World Bank, a 10 % rise in infrastructure assets directly increases GDP by up to 1 percentage point. There are many aspects to consider when dealing with infrastructure projects such as unique characteristics, complexity, risk, public safety, financial difficulty etc. The main issue is the contractor is burdened by and carries the risks involved in this type of project. The contractor’s risk management capability (RMC) reflects his team’s expertise of risk understanding and how he can manage those risks. Hence, proper assessment of RMC may contribute to the probability of achieving project objectives. In addition, assessment of the client’s risk management capability (client risk sharing) can support the RMC. The objectives of this study are: (1) to identify appropriate indices to assess the RMC of the contractor’s infrastructure pr...
It has been observed that there is no maintenance plan in most of the developing countries and ma... more It has been observed that there is no maintenance plan in most of the developing countries and maintenance is only conducted based on users' complaints or when significant structural defect is obvious to the public. Therefore, it is very important to have assessment criteriaof bridges as accurate evaluation is one of the most important and significant steps in any maintenance plan of bridges. The main purpose of this paper is to develop a criterion which is capable of assessing and evaluating the bridges, their overall condition and the condition of each element.Moreover,to develop a method that canrank the bridges in a network according to their repairing urgency. First of all different inspection typesare reviewed, then in order to obtain reliable judgment the experience and knowledge of the bridge maintenance experts in Egypt were added to the criteria by carrying out questionnaires and interviews with these experts in order to set the importance of each parameter in the eval...
Journal of Asian Architecture and Building Engineering
In a decision making study, design alternatives are compared with respect to cost, performance, a... more In a decision making study, design alternatives are compared with respect to cost, performance, and reliability, and the best is selected. Often, due to the time constraints imposed by the design s...
Journal of Asian Architecture and Building Engineering, 2020
In a decision making study, design alternatives are compared with respect to cost, performance, a... more In a decision making study, design alternatives are compared with respect to cost, performance, and reliability, and the best is selected. Often, due to the time constraints imposed by the design schedule and budget restrictions, the number of design alternatives considered is limited. This research focuses on composite flooring systems for multi-story buildings and the application of value techniques to the construction industry. The study uses data that obtained from the RSMeans Assemblies Books for the period 1997 to 2019. The data obtained from RSMeans consists of assemblies cost ($/sf of floor) as the dependent variable; and the structural span (ft.), superimposed load (p.s.f), unit cost of sheet metal ($/LF of sheet), unit cost of concrete ($/CY), unit cost of steel structural ($/ton), and total load (p.s.f) as the independent variables. A simple computer model is designed for recommending the optimal composite flooring system of a multi-story building, during the preliminary ...
Portal frame systems are widely used as coverage system in industrial projects. Selecting the pro... more Portal frame systems are widely used as coverage system in industrial projects. Selecting the proper portal frame system for a certain project depends on many technical, financial and logistical factors such as estimated cost, construction duration, availability of materials, equipment and skilled labor, besides environmental factors such as recycling and durability. The aim of this research is to create a Decision Support System (DSS) to decide the optimal portal frame system considering all these factors. The proposed (DSS) depends on integrating the Value Engineering (VE) concept with the Analytical Hierarchy Process (AHP) technique to identify the optimum system. The considered systems in this research are conventional portal made of hot rolled section, pre-engineered built-up portal frame, trussed frames and portal Frame truss. The developed (DSS) was tuned for the current Egyptian market conditions in 2019 and successfully verified using four selected projects with different h...
Steel structural projects are relatively special field of construction projects. The steel struct... more Steel structural projects are relatively special field of construction projects. The steel structure projects differ from conventional structural engineering projects mainly in the special problems that have to be considered during construction, transportation, installation and operation. The productivity improvements are attributed to the technology advances in equipment and construction methods over the last two decades. Steel structural projects are a relatively special field of construction projects. There are many factors that impact on productivity in this field. The construction industry especially the construction of steel structure projects is rated as one of the key industries. It helps in developing and achieving the goal of society. Study and knowledge of construction productivity are very important because they influence the economics of the construction industry; this is because prior knowledge of crew productivity during construction can save money and time. Investments for these projects are very high and because of the complexity in construction of steel structure projects, various factors can highly affect overall productivity, thus the project can end up adding even more time and money in order to be completed. The main purpose of this paper is present a methodology for modeling on Mat lab to construction performance control for construction process of steel structure based on the several factors that affect the steel structure processes. The Mat lab model is used for controlling on construction productivity of steel structure projects. The construction industry may use the findings of this paper as a basis for controlling and improving productivity and construction performance for the construction of steel structure projects. The ability of the estimating team to accurately determine productivity for different activities will have a significant impact on crew cost component, time schedule of the project and improve projects’ performance. The use of the Mat lab model is expected to result in savings in cost and time schedule of construction of steel structure projects as well as savings in the cost of the overall project.
Purpose The purpose of this study is how to use the quality function deployment (QFD) in the cons... more Purpose The purpose of this study is how to use the quality function deployment (QFD) in the construction industry. The study was performed for the owners and decision-makers of a construction company in Egypt, as a sample, and the owners’ requirements. Design/methodology/approach The data collection process and the type of data collected are described in this section. The data used in this study was collected from a questionnaire survey and was quantitatively analyzed using statistical analysis to identify the practices that have a statistically significant correlation with the performance of the design in the structural system of multistory buildings. A structured questionnaire five points Likert scaled based was adopted in this study; the questionnaires were distributed to experts, managers in real estate companies, construction industry-academic experts and advisors. The resulting list of factors, issues and knowledge gaps was subjected to a questionnaire survey for quantitative...
Metal oxides are widely used in adsorption technology as adsorbent surfaces because of their effi... more Metal oxides are widely used in adsorption technology as adsorbent surfaces because of their efficiency, low cost and unique physical properties. The aim of this review to clarify the role of aluminium oxide and Nano aluminium oxide in removing some chemicals contain that influence on human health such as dyes, antibiotics, and heavy metals. This paper also includes the affective of some adsorption parameters like pH, contact time, removal percentageand temperature. The Adsorption nature, kinetic adsorption models and isotherm models are also reported here.
q Emerald Group Publishing Limited 0969-9988, 2006
Purpose of the paper: When there is a need for mass production of repetitive dwelling units, a co... more Purpose of the paper: When there is a need for mass production of repetitive dwelling units, a conflict may be encountered between standard unit production models for the economical purpose and a desire by end-user to customize the units to their individual style. Such desires lead to redoing work if the dwelling units are not found to match with real requirements. This redoing process, when carried out on a large scale, results in waste of public funding resources, time and imposes additional costs on the occupants of the government housing units. This paper proposes a decision model for deciding the optimum house delivery alternatives for both the recipients and the government. Research Methodology and Approach: The decision model is designed using the Analytical Hierarchy Process (AHP). Where multiple criteria are incorporated for this purpose, such as: waiting time; citizen satisfaction; and quality of work; house delivery time; cost, losses, and finally management responsibility. Findings and the Value of the paper: A Partially Constructed Houses enable the possibility of many alternatives by the recipients which in turn avoids drawbacks of rebuilding activity and at the same time, maintains the work quality. The partially constructed housing system is proved to be effective in making a trade-off between the government's purposes and recipients' desires, but with a variable percentage of partial construction.
Earned value management (EVM) is a project performance evaluation technique that has beenoriginat... more Earned value management (EVM) is a project performance evaluation technique that has beenoriginated in industrial engineering.During the constructionphase, EVM implementation is facing some problems that may diminish the effectiveness of using earned value as a control technique for the project. The objective of this research is to identify and analyze thesedifficulties. Earned value analysis (EVA) is implemented on two different construction projects showing the effect of these difficulties on EVA results.A structured questionnaire and interviews were done for this objective.Their analysis illustrated that the technical problems mainly affect project's time control, while the project's cost control is affected mainly by the financial problems.There are some problems facing the actual cost recording that may impede the implementation of EV as a control technique
Abstract Portal frame systems are widely used as coverage system in industrial projects. Selectin... more Abstract Portal frame systems are widely used as coverage system in industrial projects. Selecting the proper portal frame system for a certain project depends on many technical, financial and logistical factors such as estimated cost, construction duration, availability of materials, equipment and skilled labor, besides environmental factors such as recycling and durability. The aim of this research is to create a Decision Support System (DSS) to decide the optimal portal frame system considering all these factors. The proposed (DSS) depends on integrating the Value Engineering (VE) concept with the Analytical Hierarchy Process (AHP) technique to identify the optimum system. The considered systems in this research are conventional portal made of hot rolled section, pre-engineered built-up portal frame, trussed frames and portal Frame truss. The developed (DSS) was tuned for the current Egyptian market conditions in 2019 and successfully verified using four selected projects with different height to span ratio.
These instructions provide you guidelines for preparing papers for International Journal of Appli... more These instructions provide you guidelines for preparing papers for International Journal of Application or Innovation in Cantilevered sheet pile walls are commonly used in shoring systems of deep excavation down to about 5.00 m. The most common design procedure for this type of flexible retaining structures is to determine the required penetration depth for stability and then increasing the calculated penetration depth by 20% to 40% to achieve a factor of safety of about 1.5 to 2.0. This procedure has two disadvantages; first, the procedure does not give accurate values for penetration depth or corresponding factor of safety, second, it ignores the effect of uncertainty in the used geotechnical parameters. The first aim of this study is to overcome those two disadvantages by introduce an alternative formula to determine the optimum penetration depth of cantilever sheet pile walls in dry granular soil based on reliability analysis concept, while, the second aim is to study the impact...
Abstract Reinforced concrete multi-story buildings are commonly used in residential, commercial, ... more Abstract Reinforced concrete multi-story buildings are commonly used in residential, commercial, and administrative projects; therefore, selecting the optimum structural system with minimum cost is the top priority of the structural designer. Although earlier researches intensively studied this issue, it is still not completely covered. This research aims to introduce recommendations for the optimum gravity and lateral systems for a multi-story reinforced concrete (RC) building from a perspective of direct cost. In order to achieve that goal, a parametric study was carried out using 72 RC buildings with several stories ranged between 5 and 50 floors, and grid spacing ranged between 6.0 and 12.0 m. Four floor systems were considered, solid, 2 ways ribbed, waffle, and flat slabs. Also, three lateral loads resisting systems were considered which are intermediate moment resisting frames, shear walls, and a dual system. The study covered the low, medium and high rise buildings. The results indicated that the dual system is the most suitable system for medium and high rise buildings with combination with solid slabs for short spans and ribbed slabs for medium and long spans. On the other hand, frame with solid slabs is the optimum for low rise with short spans and shear wall with the flat slab is the optimum for low rise with medium and long spans.
ABSTRACT: Value Engineering (VE) concept does not mean a cost reduction only, but it extends beyo... more ABSTRACT: Value Engineering (VE) concept does not mean a cost reduction only, but it extends beyond. VE is a powerful problem-solving tool that can reduce costs while maintaining or improving performance and quality requirements. It's a function-oriented, systematic team approach to providing value in a product or service. Construction project as a product or service is generally considered to have good value if this product or service has appropriate performance and cost. The construction product's characteristics differ than those in manufacture in many aspects such as immobility, complexity, durability, cost lines, and high degree of social responsibility. These characteristics are highly affected by the construction technology. Where, adopting these new technologies and working method in proper work environment can maximize the product with a working time reduction by 25% and cost reduction by 20% in average. Slip Form (S.F) is considered one of these common methods of...
International Journal of Construction Engineering and Management, 2018
Purpose – Construction labor productivity in bridges of great interest to practitioners and resea... more Purpose – Construction labor productivity in bridges of great interest to practitioners and researchers because it affects project cost and time overrun. This paper evaluates and ranks the importance, frequency and severity of project delay factors that affect the construction labor productivity for construction of Pre-stressed concrete bridges. Design/erection / methodology: A total of 50 respondents consisting of owners contractors, and consulting participated in this study. The respondents were asked to indicate how important each item of a list of many bridges project related factors was to construction labor productivity for construction of Pre-stressed concrete bridges. The data were then subjected to the calculation of important indices which enabled the factors to be ranked. Findings: The eleven most important factors identified by them were: design factor, equipment factor, execution and construction factor, external factor, financial factor, healthy and safety factor, labo...
Bridges represent a significant percentage of the economy of many countries. They are a vital com... more Bridges represent a significant percentage of the economy of many countries. They are a vital component of the country's road and highway network. Bridges are subjected to harsh environmental conditions throughout their service-life and consequently structural deterioration occurs. Asset managers are required to maintain networks in good service conditions and; in many cases with limited funds. The objective of this research is to develop a decision support system (DSS) for concrete bridges that provides assistance to the decision maker in evaluating and prioritizing the maintenance strategy of bridges. Thus, the decision maker can identify the urgency level of repair and select the optimal maintenance plan, either for a network of bridges, or on a single level, taking budget limitations into consideration. A comprehensive survey was conducted for data collection in order to build the system's database. This database includes different factors which are incorporated into the...
A computer-based systematic approach for optimizing material cost in reinforced concrete elements... more A computer-based systematic approach for optimizing material cost in reinforced concrete elements is presented. This approach considers the current material cost in the trade-off and selection of member dimensions and reinforcement design of concrete elements such as beams and columns. The theoretical framework is to design reinforced concrete structure based on the cost of available materials and not just on the availability of materials. The windows-oriented computer program developed for this purpose would also be beneficial to owners, designers and contractors interested in cost optimization of reinforced concrete elements.
Infrastructure projects are crucial to the economy of any country, especially developing ones suc... more Infrastructure projects are crucial to the economy of any country, especially developing ones such as Egypt and most African countries. According to the World Bank, a 10 % rise in infrastructure assets directly increases GDP by up to 1 percentage point. There are many aspects to consider when dealing with infrastructure projects such as unique characteristics, complexity, risk, public safety, financial difficulty etc. The main issue is the contractor is burdened by and carries the risks involved in this type of project. The contractor’s risk management capability (RMC) reflects his team’s expertise of risk understanding and how he can manage those risks. Hence, proper assessment of RMC may contribute to the probability of achieving project objectives. In addition, assessment of the client’s risk management capability (client risk sharing) can support the RMC. The objectives of this study are: (1) to identify appropriate indices to assess the RMC of the contractor’s infrastructure pr...
It has been observed that there is no maintenance plan in most of the developing countries and ma... more It has been observed that there is no maintenance plan in most of the developing countries and maintenance is only conducted based on users' complaints or when significant structural defect is obvious to the public. Therefore, it is very important to have assessment criteriaof bridges as accurate evaluation is one of the most important and significant steps in any maintenance plan of bridges. The main purpose of this paper is to develop a criterion which is capable of assessing and evaluating the bridges, their overall condition and the condition of each element.Moreover,to develop a method that canrank the bridges in a network according to their repairing urgency. First of all different inspection typesare reviewed, then in order to obtain reliable judgment the experience and knowledge of the bridge maintenance experts in Egypt were added to the criteria by carrying out questionnaires and interviews with these experts in order to set the importance of each parameter in the eval...
Journal of Asian Architecture and Building Engineering
In a decision making study, design alternatives are compared with respect to cost, performance, a... more In a decision making study, design alternatives are compared with respect to cost, performance, and reliability, and the best is selected. Often, due to the time constraints imposed by the design s...
Journal of Asian Architecture and Building Engineering, 2020
In a decision making study, design alternatives are compared with respect to cost, performance, a... more In a decision making study, design alternatives are compared with respect to cost, performance, and reliability, and the best is selected. Often, due to the time constraints imposed by the design schedule and budget restrictions, the number of design alternatives considered is limited. This research focuses on composite flooring systems for multi-story buildings and the application of value techniques to the construction industry. The study uses data that obtained from the RSMeans Assemblies Books for the period 1997 to 2019. The data obtained from RSMeans consists of assemblies cost ($/sf of floor) as the dependent variable; and the structural span (ft.), superimposed load (p.s.f), unit cost of sheet metal ($/LF of sheet), unit cost of concrete ($/CY), unit cost of steel structural ($/ton), and total load (p.s.f) as the independent variables. A simple computer model is designed for recommending the optimal composite flooring system of a multi-story building, during the preliminary ...
Portal frame systems are widely used as coverage system in industrial projects. Selecting the pro... more Portal frame systems are widely used as coverage system in industrial projects. Selecting the proper portal frame system for a certain project depends on many technical, financial and logistical factors such as estimated cost, construction duration, availability of materials, equipment and skilled labor, besides environmental factors such as recycling and durability. The aim of this research is to create a Decision Support System (DSS) to decide the optimal portal frame system considering all these factors. The proposed (DSS) depends on integrating the Value Engineering (VE) concept with the Analytical Hierarchy Process (AHP) technique to identify the optimum system. The considered systems in this research are conventional portal made of hot rolled section, pre-engineered built-up portal frame, trussed frames and portal Frame truss. The developed (DSS) was tuned for the current Egyptian market conditions in 2019 and successfully verified using four selected projects with different h...
Steel structural projects are relatively special field of construction projects. The steel struct... more Steel structural projects are relatively special field of construction projects. The steel structure projects differ from conventional structural engineering projects mainly in the special problems that have to be considered during construction, transportation, installation and operation. The productivity improvements are attributed to the technology advances in equipment and construction methods over the last two decades. Steel structural projects are a relatively special field of construction projects. There are many factors that impact on productivity in this field. The construction industry especially the construction of steel structure projects is rated as one of the key industries. It helps in developing and achieving the goal of society. Study and knowledge of construction productivity are very important because they influence the economics of the construction industry; this is because prior knowledge of crew productivity during construction can save money and time. Investments for these projects are very high and because of the complexity in construction of steel structure projects, various factors can highly affect overall productivity, thus the project can end up adding even more time and money in order to be completed. The main purpose of this paper is present a methodology for modeling on Mat lab to construction performance control for construction process of steel structure based on the several factors that affect the steel structure processes. The Mat lab model is used for controlling on construction productivity of steel structure projects. The construction industry may use the findings of this paper as a basis for controlling and improving productivity and construction performance for the construction of steel structure projects. The ability of the estimating team to accurately determine productivity for different activities will have a significant impact on crew cost component, time schedule of the project and improve projects’ performance. The use of the Mat lab model is expected to result in savings in cost and time schedule of construction of steel structure projects as well as savings in the cost of the overall project.
Purpose The purpose of this study is how to use the quality function deployment (QFD) in the cons... more Purpose The purpose of this study is how to use the quality function deployment (QFD) in the construction industry. The study was performed for the owners and decision-makers of a construction company in Egypt, as a sample, and the owners’ requirements. Design/methodology/approach The data collection process and the type of data collected are described in this section. The data used in this study was collected from a questionnaire survey and was quantitatively analyzed using statistical analysis to identify the practices that have a statistically significant correlation with the performance of the design in the structural system of multistory buildings. A structured questionnaire five points Likert scaled based was adopted in this study; the questionnaires were distributed to experts, managers in real estate companies, construction industry-academic experts and advisors. The resulting list of factors, issues and knowledge gaps was subjected to a questionnaire survey for quantitative...
Metal oxides are widely used in adsorption technology as adsorbent surfaces because of their effi... more Metal oxides are widely used in adsorption technology as adsorbent surfaces because of their efficiency, low cost and unique physical properties. The aim of this review to clarify the role of aluminium oxide and Nano aluminium oxide in removing some chemicals contain that influence on human health such as dyes, antibiotics, and heavy metals. This paper also includes the affective of some adsorption parameters like pH, contact time, removal percentageand temperature. The Adsorption nature, kinetic adsorption models and isotherm models are also reported here.
q Emerald Group Publishing Limited 0969-9988, 2006
Purpose of the paper: When there is a need for mass production of repetitive dwelling units, a co... more Purpose of the paper: When there is a need for mass production of repetitive dwelling units, a conflict may be encountered between standard unit production models for the economical purpose and a desire by end-user to customize the units to their individual style. Such desires lead to redoing work if the dwelling units are not found to match with real requirements. This redoing process, when carried out on a large scale, results in waste of public funding resources, time and imposes additional costs on the occupants of the government housing units. This paper proposes a decision model for deciding the optimum house delivery alternatives for both the recipients and the government. Research Methodology and Approach: The decision model is designed using the Analytical Hierarchy Process (AHP). Where multiple criteria are incorporated for this purpose, such as: waiting time; citizen satisfaction; and quality of work; house delivery time; cost, losses, and finally management responsibility. Findings and the Value of the paper: A Partially Constructed Houses enable the possibility of many alternatives by the recipients which in turn avoids drawbacks of rebuilding activity and at the same time, maintains the work quality. The partially constructed housing system is proved to be effective in making a trade-off between the government's purposes and recipients' desires, but with a variable percentage of partial construction.
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Papers by Ibrahim Mahdi