In order to highlight the amount of potentially useful resources
inherent in the waste emanating from construction activities in
Thailand, the composition of waste by material type was computed
according to the methodology outlined by HQ Air Force Center for
Environmental Excellence (2006). However, the rounded average
composition of construction waste as specified in the methodology
was not adequately disaggregated to reflect the nature of construction
waste obtained in Thailand. Therefore, the percentage composition
of construction waste as stated in Bergsdal (2007) was
utilized as it closely reflected the types of wastes observed at construction
sites in Thailand. It must be noted that a limitation of this
method is that certain materials such as asbestos, which have a relatively
low fraction of the total waste, appear to be insignificant
when analysis is carried out on a national scale. The estimated
quantity of construction waste by material type for each construction
type for each year was obtained according to the equation: