Reliability Evaluation of Pavement Life-Cycle Assessment Model

Table 6

Parameter uncertainties of the asphalt pavement LCA model.

Stage	Parameters	Uncertainty^1	Distribution form
Material production	Asphalt production	—	Probability density function
	Aggregate production	UF = 1.62	Lognormal distribution
	Mixing	UF = 1.47	Lognormal distribution
	SBS amount^2	UF = 1.09	Uniform distribution
	Asphalt amount	UF = 1.09	Uniform distribution
	Asphalt aggregate heating	UF = 1.09	Uniform distribution
Construction stage	Shift	UF = 1.09	Uniform distribution
Transportation stage	Transport distance	UF = 1.41	Uniform distribution
	Carbon emission rate of transportation energy	UF = 1.14	Uniform distribution
Postprocessing stage	Shift	UF = 1.09	Uniform distribution
	Transport distance	UF = 1.41	Uniform distribution

Note. 1: uncertainty parameters determined by engineering investigation (the subscripts are similar); 2: the asphalt amount adjusted with SBS amount.