Research on the Infrared Thermographic Detection of Concrete under Solar Heating

Table 2

Growth rate of temperature difference.

Def.	B1	B2	B3	B4	B5	B6	B7	B8
L[mm]	100	80	60	40	80	80	80	80
D(mm)	18	18	18	18	20	32	44	56
Time range(s)	200∼600				200∼800		>800
S	0.0058	0.0058	0.0059	0.0050	0.0034	0.0014	0.0009	0.0005