Temperature Gradient and Its Effect on Long-Span Prestressed Concrete Box Girder Bridge

Table 1

Material properties.

Parameters	Concrete	Asphalt concrete
Density, ρ (kg/m^3)	2500	2100
Specific heat capacity, c (J/kg·°C)	980	1170
Thermal conductivity, k (W/m·°C)	2.4	0.98
Absorptivity, α	0.65	0.9
Emissivity, ε0	0.88	0.95