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MODELLING AND EXPERIMENTATION OF THE CONCRETE SUPPLY AND DELIVERY PROCESS
Titel:
MODELLING AND EXPERIMENTATION OF THE CONCRETE SUPPLY AND DELIVERY PROCESS
Auteur:
Smith, Simon D.
Verschenen in:
Civil engineering & environmental systems
Paginering:
Jaargang 16 (1999) nr. 2 pagina's 93-114
Jaar:
1999-04-01
Inhoud:
Like many construction processes, concrete delivery and supply is stochastic. This system cannot therefore be modelled deterministically, using average data as input, as the resulting estimates of productivity and cost would be not take into account any negative effects of the random nature of events. The many factors that influence the concrete system can be summarised into: truckmixer interarrival time, truckmixer position time, concrete load pump time, truckmixer volume and concrete rejection rate. The work described in this paper starts with a model of the above factors, based on actual observations of real concreting activities. The random variability of the factors has been incorporated into the model by the use of the gamma distribution, which was found to match the raw data better than other commonly used probability distributions. Of the many methods available to analyse such a model, simulation was used because of its ease of application and because it allows the model to be experimented with: if the model is valid, results obtained through the experimentation will have both significance and use in the management of the real system. The main results of the experimental analysis concern the optimisation of the concreting process: the maximisation of productivity and the minimisation of cost. It is the latter which provides the most interesting and useful conclusions, which shows that the cost of a concreting operation to the concrete supplier varies significantly depending on the operating conditions. This variation in cost is much more marked than the variation of contractor cost - an important anomaly as the contractor has a greater influence over the management of concreting operations.
Uitgever:
Taylor & Francis
Bronbestand:
Elektronische Wetenschappelijke Tijdschriften
Details van artikel 112 van 151 gevonden artikelen
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