Laboratory Investigation on Preplaced Ballast Aggregate Concrete Deterioration over Freezing–Thawing Cycles

International Journal of Concrete Structures and Materials

Table 5 Statistical parameters of Gamma distribution

Cycle	Statistical parameter	Real value	Estimated value
100	Mean	10.81	10.81
	Variance	614.23	614.23
	Skewness	5.17	4.59
	k	–	0.19
	Beta	–	56.83
	D value of Kolmogorov–Smirnov test	–	0.57
200	Mean	12.61	12.61
	Variance	985.49	985.49
	Skewness	5.43	4.98
	k	–	0.16
	Beta	–	78.15
	D value of Kolmogorov–Smirnov test	–	0.59
300	Mean	10.62	10.62
	Variance	634.17	634.17
	Skewness	5.41	4.74
	k	–	0.18
	Beta	–	59.72
	D value of Kolmogorov–Smirnov test	–	0.59