Experimental Study on the Effect of Freeze-Thaw Cycles on Axial Tension and Compression Performance of Concrete after Complete Carbonization

Table 5

Parameters of axial tension curve of concrete specimens of different grades.

Strength grade of concrete	C0F0		CF0		CF25		CF50		CF75		CF100
	a1	R^2	a1	R^2	a1	R^2	a1	R^2	a1	R^2	a1	R^2
C30	1.0029	0.999	1.0939	0.988	1.3519	0.999	1.5956	0.997	1.980	0.998
C40	1.0012	0.999	1.1651	0.999	1.0021	0.999	1.0273	0.995	1.2015	0.984	1.3982	0.998
C45	0.9633	0.999	1.1449	0.999	0.9581	0.991	0.9206	0.992	0.9605	0.996	1.1026	0.999

Note. R² is the fitting correlation coefficient. The closer to 1, the higher the fitting degree.