Minimisation des surcoûts dans un contexte hors délai : cas des projets de construction dans les pays en développement

2007 ◽  
Vol 34 (9) ◽  
pp. 1180-1191
Author(s):  
Paul Louzolo-Kimbembé ◽  
Chrispin Pettang ◽  
Thomas Tamo Tatiétsé
Keyword(s):  
Construction Industry ◽  
Completion Time ◽  
Cost Overrun ◽  
Financial Problem ◽  
Cost Overruns ◽  
Total Cost ◽  
Normal Duration ◽  
Optimisation Model ◽  
The Cost ◽  
Reference Cost

Cost overruns are frequent in the construction industry. They become greater the more the construction project is delayed. In developing countries, this situation is recurring and constitutes a significant financial problem. In a time-overrun context, our objective is to find a method that can enable us to reduce the delay while minimizing the subsequent cost overruns. We thus developed a mathematical model named CCOMTOC (construction cost optimisation model in time-overrun context). The model was tested and results reveal that the reduction of cost overruns is effective. We showed that in a time-overrun context, according to the importance of delay penalties, we obtain two distinct situations. On the basis of the reference cost calculated for a maximum compression of tasks within the normal duration, we note that, for low delay penalties, the total cost after further delays to the estimated completion time decreases as we deviate from the initial completion time. On the other hand, for relatively high delay penalties, the cost first passes by a minimum before increasing regularly during the further delays to the estimated completion time.Key words: time overrun, optimization, linear programming, time skid, delay make-up, cost overrun.

scholarly journals A BESPOKE APPROACH FOR RELATING MATERIAL WASTE TO COST OVERRUN IN THE CONSTRUCTION INDUSTRY

2017 ◽  
Vol 1 (1) ◽  
pp. 39-52
Author(s):  
Ibrahim Saidu ◽  
W Shakantu ◽  
A Adamu ◽  
I Anugwo
Keyword(s):  
Construction Industry ◽  
Construction Material ◽  
Methodological Approach ◽  
Construction Project ◽  
Project Managers ◽  
Cost Overrun ◽  
Project Cost ◽  
Cost Overruns ◽  
Project Completion ◽  
Final Project

The problems of material waste and cost overruns are common in the construction industry. These problems occur at different stages of a construction project, from planning, design to project completion. The argument on how to eliminate cost overrun has been on-going for the past 70 years as on-site wastage of materials leads to increase in the final project cost. This paper examines the relationship between the causes of material waste and those of cost overrun at the pre-contract and post-contract stages of a project. The desktop methodological approach was firstly adopted in comparing the causes of material waste and those of cost overruns from the literature, in order to determine the possible relationship. Subsequently, interviews were purposively conducted with construction professionals within Abuja, Nigeria, in order to verify the literature based information. The result reveals that all the causes of material waste also cause cost overrun at the pre-contract and the post-contract stages of a project. 96.88% and 81.81% of the causes of cost overrun also cause material waste at the pre-contract and post-contract stages respectively. Other causes which are not related are mostly, the micro-economic and macro-economic factors. These results are not different from those of the interviews conducted with professionals and summarised in the tick box. It was also found that to achieve Effective Construction Material Waste Management (ECMWM) for any construction project, material waste must be controlled at its sources and causes, and at different stages of a project. Based on these findings, it can be concluded that effective management of material waste would translate into a reduction in the level of project cost overrun. The study recommends that construction-project managers, as well as the construction practitioners should encourage the management of material-waste causes, as it has the potential to minimise cost overrun for projects. 

scholarly journals Delays and Cost Overruns Causes During Construction of Palm Oil Refinery Projects

2018 ◽  
Vol 203 ◽  
pp. 02004 ◽  
Author(s):  
Muhammad Sani Abdullah ◽  
Wesam S Alaloul ◽  
Mohd Shahir Liew ◽  
Bashar S Mohammed
Keyword(s):  
Construction Industry ◽  
Palm Oil ◽  
Developing Nations ◽  
Project Performance ◽  
Oil Refinery ◽  
Cost Overrun ◽  
Cost Overruns ◽  
Planning And Scheduling ◽  
Important Index ◽  
Common Problems

Delays and cost overruns are obviously common problems in the construction industry in several developed and developing nations. The purpose of this study is to identify factors cause delays and cost overruns in the construction of palm oil refinery projects in Malaysia. A questionnaire survey of a randomly selected sample was filled by 89 respondents. The questionnaire included 179 factors which classified into 13 groups. The degree of importance of the delays and cost overrun factors were evaluated and ranked by importance degree, based on the viewpoints of stakeholders. The data was analytically investigated by descriptive statistic methods and Relative Important Index (RII). The results of RII showed that Delays in subcontractor’s work, Lack of subcontractor skill, and Poor/inadequate planning and scheduling with RII 0.78, 0.77, and 0.75, respectively, are the most important causes. These causes represent the baseline margin for project management of palm oil refinery construction and development. According to these results, it is suggested that: project client should collaborate with contractors and simplify payments procedures to mitigate delays; coordinate continuously and enhance the association among project stakeholders are obligatory in order to improve the project performance.

scholarly journals Influence of rebar practice in the total cost of building construction projects: The case of Hawassa city, Ethiopia

2020 ◽  
Vol 12 (1) ◽  
pp. 54-65
Author(s):  
Tariku Nigussie ◽  
M.K. Chandrasekar
Keyword(s):  
Construction Projects ◽  
Cost Overrun ◽  
Value Analysis ◽  
Total Cost ◽  
Correlation And Regression Analysis ◽  
Central Value ◽  
Research Designs ◽  
Analytical Research ◽  
The Cost ◽  
Bill Of Quantity

Rebar is one of the materials which is so scarce and highly expensive. The existing practices produce a large quantity of wastage; which contributes to the increment of the project cost. This study aimed to analyze the causes, extent, and remedies of steel wastages on the total costs of construction projects in Hawassa city. The study followed descriptive and analytical research designs. The cost estimated in the bill of quantity and the final cost after the provision of the steel with alterations was compared and the reasons for cost overrun were analyzed. The data were analyzed using Central value analysis, correlation and regression analysis using SPSS stat20, RebarWin7.97, ETABS2016. The percentage of the cost of steel wastage in total cost was found 1.43%. The result of the study verdict that frequent design change and bare-benders skill gap contribute much to the material wastage, thus for the cost overrun of projects. Keywords: Bending gain, cost overrun, detailing, rebar, redesign, steel, wastage

scholarly journals Cost Overruns in Tunnelling Projects: Investigating the Impact of Geological and Geotechnical Uncertainty Using Case Studies

2020 ◽  
Vol 5 (9) ◽  
pp. 73
Author(s):  
Chrysothemis Paraskevopoulou ◽  
Georgios Boutsis
Keyword(s):  
Case Studies ◽  
Research Work ◽  
Construction Cost ◽  
Cost Overrun ◽  
Cost Overruns ◽  
Total Cost ◽  
Ground Investigation ◽  
Major Factors ◽  
The Uk ◽  
The Impact

Tunnelling projects seldom meet the initial budget requirements. Commonly, these types of projects suffer from cost overruns, which subsequently lead to project delivery delays mainly due to unsuccessful ground investigation as specified in the literature. The presented work scrutinises the effect of ground investigation in cost overruns. More specifically, various cost figures (total cost, construction cost, tunnel cost) are analysed for two case studies i) the Channel tunnel in the UK and ii) the Olmos Tunnel in Peru. Clayton’s relation between ground investigation and the construction cost is utilised and further investigated. In the Channel tunnel, the main problems faced led to a cost overrun of 78% for the total cost, 66% for the construction cost and 77% for the tunnelling cost. In the Olmos tunnel, two main geological scenarios are analysed and the construction cost overrun is calculated at 9.6% and 6.7%. Drawing on the conclusions, this research work proves that ground investigation can be one of the major factors influencing the tunnel cost.

COST OPTIMIZATION OF MULTIPLE RESOURCES ALLOCATION FOR MULTI-PROJECTS

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Sarah Aboul Fotouh ◽  
A. Samer Ezeldin
Keyword(s):  
Genetic Algorithm ◽  
Construction Industry ◽  
Cost Optimization ◽  
Project Managers ◽  
Resources Allocation ◽  
Total Cost ◽  
Multiple Resources ◽  
The Cost ◽  
Critical Resources ◽  
Available Resources

As the construction industry grows year by year, optimization of resources is becoming essential to reduce their required number, their costs and as a consequence the total cost of the project. Project managers have to face problems regarding management of cost, time, and available resources for single projects. What is more challenging is to optimize the available resources for multiple projects, which would result in appreciable savings. Most of the companies in the construction industry commonly optimize the resources for single project. However, with the presence of several mega projects in many developing countries running at the same time, there is a need for a model to enhance the efficiency of available resources among multiple simultaneous projects. This paper discusses a numerical model of cost optimization and allocation of up to nine resources for up to three projects for a given company, taking into consideration the transportation of resources from one project to another and the cost of unused resources. The model was developed using a genetic algorithm, and it is used on the identified critical resources. It calculates the cost of each resource, minimizes the cost of extra resources, cost of unused resources, and generates the schedule of each project within a selected overall program.

scholarly journals Analysis Cost Overruns, Delays and Risk Involved in Construction Management Using Primavera

2018 ◽  
Vol 7 (3.10) ◽  
pp. 160 ◽  
Author(s):  
T Subramani ◽  
P Sivakumar
Keyword(s):  
Construction Industry ◽  
Great Risk ◽  
Construction Management ◽  
Construction Projects ◽  
The Other ◽  
Cost Overrun ◽  
Management Compensation ◽  
Social Effect ◽  
Cost Overruns ◽  
Resource Creation

Construction industry is taken into consideration as one of the maximum crucial industries in India. These phenomena may additionally have an effect on the development of construction industry in India. In addition to may additionally expose many establishments of construction to be destroyed. Delays in addition to disruptions are sources of capacity risks that studies are looking into techniques to manipulate along with technical, social, monetary, felony, economic, useful resource, creation and commercial. To evaluate the reasons of delays and conflicts are due to: layout modifications, delays in price to contractors, facts delays, investment troubles, bad challenge management, compensation problems and disagreement at the valuation of labor accomplished. On the other hand, time overrun, cost overrun, bad social effect, idling assets and disputes are the principle outcomes of delays and disruptions. The observe concludes the reasons of delays and disruptions and their outcomes placed construction projects at extremely great risk that have an impact on their performance the use of primavera. 

scholarly journals Training Program in the Construction projects

2020 ◽  
Vol 9 (5) ◽  
pp. 515-522
Keyword(s):  
Training Program ◽  
Construction Industry ◽  
Construction Projects ◽  
System Dynamic ◽  
Cost Overruns ◽  
Efficient Performance ◽  
Comprehensive Development ◽  
Unskilled Workers ◽  
The Cost ◽  
The Impact

Construction is questionably a main part in relative to comprehensive development . It plays an important part in the role in the economy as and in people’s survives over influencing and preserving the environment of the city-region’s constructed, and it is a rising sector. To provide an efficient performance and more development of the economic, there is emphases on optimizing the employees contribution to the goals and areas of the governments. The training significance as a management central part has long been documented by principal writers.This paper aim to find the impact of training in the construction industry and how the training is been underestimate lead in increase the cost by using the simulation technique system dynamic. The research methodology include designing of questionnaire that consist of three items , the first item include , general Training (Training Program), evaluation of on-the-job training and evaluation of training after establishing work and the second part include building the model using system dynamic to show the effect of training on the cost of construction. the results the authors made the following conclusions .The absence of training program has very strong effect as the absence of such program is caused by the finance absence , this is common problem with Iraqi construction industry. The most environment of the Iraqi industry is the absence of the finance from both owner and contractor as they ignore this part and consider unnecessary expenses and this will lead to unqualified engineering or worker in the wrong job .The absence of management mean that , usually the contractor and his staff are working without the supervise or represented from the owner side , which some time mean unskilled workers may be hired which lead to delay of the work and cost overruns .

scholarly journals Factors of Schedule and Cost Performance of Tunnel Construction Megaprojects

2021 ◽  
Vol 15 (1) ◽  
pp. 38-49
Author(s):  
Alberto De Marco ◽  
Timur Narbaev
Keyword(s):  
Statistical Significance ◽  
Project Managers ◽  
Decision Makers ◽  
Tunnel Construction ◽  
Cost Overrun ◽  
Cost Overruns ◽  
Strategic Design ◽  
Schedule Delay ◽  
Low Performance ◽  
The Cost

Aims: This study illustrates the main factors that influence the cost overruns and schedule delays of tunnel construction megaprojects. Objective: An empirical analysis was carried out based on a dataset collected from a number of recent tunnel megaprojects worldwide. Methods: Analyses of variances and regression analyses were conducted to infer statistical significance and understand the relationships that exist between cost overruns, time delays and variables of context, technical, and governance characteristics of the sample projects. Results: The most significant factors are those related to the complexity of infrastructure and the type of contracting system used to deliver the project. In particular, some technical characteristics pertinent to the size of the tunnel reveal to be influencing factors of both schedule delay and cost overrun, while the usage of a traditional contracting mechanism is likely to impact the cost overrun. The type of infrastructure, region, ownership, and funding scheme are not found to be statistically significant determinants of cost and time performance. Conclusion: This analysis reaffirms that the size and complexity are important factors of typical low performance of tunnel construction megaprojects. The results of this study can be used for strategic design and planning by decision-makers, project managers and designers.

FACTORS AFFECTING COST OVERRUN IN CONSTRUCTION PROJECTS

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Mohammed Algahtany
Keyword(s):  
Saudi Arabia ◽  
Construction Projects ◽  
Cost Overrun ◽  
Cost Overruns ◽  
Factors Affecting ◽  
Public Projects ◽  
Low Performance ◽  
Major Factors ◽  
Public Construction ◽  
The Cost

Public construction projects in Saudi Arabia have been suffering from low performance for the past decade. Cost overrun is one of the most important issues in project’s performance and is nearly associated with most of public projects. The aim of this study is to identify and assess the major factors leading to cost overruns in education construction projects in the Northern Province of Saudi Arabia to minimize the risks’ effects in future projects. The research methodology started by identifying cost overrun factors through literature review, project’s documentations, and experts’ interviews. Professionals who worked at the construction projects undertook a questionnaire survey to investigate the importance of the cost overrun factors. The top factors of cost overrun were identified through the analysis of the factors’ occurrence and severity. The study main results included the top causes of cost overrun which are delay in contractors’ progress payment by client, difficulties in financing project by contractor, delays in sub-contractor’s work, additions of quantities such as excavation, backfill, and concrete works, and bid award for lowest price. The investigated risks in the study should be evaluated and mitigated in future projects to minimize their effects and enhance the industry performance.

scholarly journals COVID-19 pandemic impact: an identification of the cause of cost overrun in construction project

2021 ◽  
Vol 331 ◽  
pp. 01014
Author(s):  
Yervi Hesna ◽  
Jati Sunaryati ◽  
Ayu Hidayati
Keyword(s):  
Construction Industry ◽  
Construction Project ◽  
Health And Safety ◽  
Cost Overrun ◽  
Project Cost ◽  
Heavy Equipment ◽  
Two Factors ◽  
Implementation Time ◽  
The Cost ◽  
The Impact

The paper provides a thorough examination of the impact of COVID-19 on increasing the cost of the construction project. The pandemic of COVID-19 had disrupted the financial and operational of the construction industry. Many projects have been closed and suspended, and this situation has caused great uncertainty in the construction industry. Even though the Instruction of the Minister of Public Work No. 2/2020 issued March 27, 2020, stated that construction activities in Indonesia could continue work. However, it still believes COVID-19 can lead to poor project cost performance. The study used a literature review to explore the factors contributing to the increase in project cost. A case study in the hotel construction project is used to test the factors. The research found six factors have a frequency of occurrence for each cause of cost overrun, namely labor, material, implementation time, project financial aspects, estimated cost, and occupational health and safety. The case study’s two factors are not the cause of the cost overrun based on the interviewee’s answer: heavy equipment and overhead. This paper also explains the mechanism to address cost overrun continue in construction work.

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