Birnbaum-Saunders Durability Life Prediction Model of Site-Exposed Concrete in the Saline Soil Area

Table 4

Estimated parameters of B–S life model.

Parameter	Mass index		Dynamic elastic modulus index
			M Position		N position		L Position
	α	β	α	β	α	β	α	β
C30	0.06801	3679.28	0.09383	3198.19	0.08104	2216.90	0.07519	2799.33
C40	0.05796	5405.22	0.06472	3505.17	0.06973	2408.63	0.09055	3183.06
C50	0.04681	6711.78	0.07985	3994.15	0.06165	2740.35	0.06025	3775.84