The Correlation between Pore Structure and Macro Durability Performance of Road Concrete under Loading and Freeze-Thaw and Drying-Wetting Cycles

Table 3

Grey correlation degree between pore structure parameters and antifreezing index under different loading levels and freeze-thaw and drying-wetting cycles.

Strength	Parameters
	Porosity/%	Total pore surface area/m^2/g	Area median aperture/nm	Average aperture/nm	Most probable pore size/nm	Pore fractal dimension
50% loading
C1	0.905	0.838	0.533	0.585	0.782	0.733
C2	0.930	0.885	0.587	0.569	0.787	0.785
80% loading
C1	0.842	0.896	0.579	0.561	0.749	0.731
C2	0.819	0.943	0.624	0.563	0.737	0.737
Strength	Parameters
	More harmful pore/nm	Harmful pore/nm	Less harmful pore/nm	Harmless pore/nm	Pore spacing coefficient	/
50% loading
C1	0.692	0.600	0.835	0.931	0.655	/
C2	0.710	0.699	0.807	0.957	0.704	/
80% loading
C1	0.721	0.644	0.762	0.873	0.695	/
C2	0.690	0.700	0.739	0.900	0.691	/