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

Abstract

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.

A Decision Support Tool for Cost Mastering in Urban Self-Construction: The Case of Cameroon

“…But, any estimate whatever its precision, cannot only guarantee the control of the cost of construction [5]; it constitutes only one of the aspects of the control of the project cost, the realisation stage being able to undergo various disturbances able to go beyond initial budget. Very often it was noted that even with financial resources available, the self constructor has many difficulties in carrying out his construction project.…”

“…In addition, the problems encountered in this sector are those to do with the determination of the causes of costs overruns and datelines, which can sometimes be attributed to bad weather, strikes, financial difficulties [2], materials mismanagement, slow decision-making, and irregularities in the design, planning and execution of the projects [3], deficiencies in management of the contract or the on-the-site modifications of the project [4]. According to other researchers, it is primarily due to the inappropriate techniques of costs estimation and the bad practices of project management [5].…”