Study on Conventional and Rheological Properties of Corn Stalk Bioasphalt/PPA Composite Modified Asphalt

Table 14

Analysis of variance of BBR.

Index	Factor	Deviation sum of squares	Degrees of freedom	Mean-squared	F-value	value	Significance
Creep rate	PPA	0.051	3	0.017	19.28	0.001
	Bioasphalt	0.003	3	0.001	0.21	0.89
	Shear time	0.004	3	0.001	0.24	0.87
	Shear rate	0.000	3	0.001	0.02	0.99
Stiffness modulus	PPA	1585.72	3	528.57	4.07	0.03
	Bioasphalt	1137.03	3	379.01	2.26	0.13
	Shear time	226.19	3	75.4	0.310	0.82
	Shear rate	93.47	3	31.16	0.122	0.95

 ≤ 0.1 is generally significant.  ≤ 0.05 is significant.  ≤ 0.001 is particularly significant.