International Journal of Concrete Structures and Materials

Table 3 Summary of equations for best fit lines and goodness of fit (R-squares) for old bridges.

From: Seasonal Variation and Age-related Changes in the Relative Permittivity of Concrete Bridge Decks on Korea Expressways

Bridges	Best fit lines	R²
Branch of Jungbu Naeryuk	Y = 4.98 \( e^{0.0092x} \)	0.46
88	Y = 6.79 \( e^{0.0048x} \)	0.23
Jungbu	Y = 5.48 \( e^{0.0071x} \)	0.41
Honam	Y = 5.23 \( e^{0.0096x} \)	0.58
All bridges	Y = 5.57 \( e^{0.0074x} \)	0.40

X relative humidity of the air and Y relative permittivity of concrete.

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