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

Table 8

Analysis of variance of conventional physical properties.

Index	Factor	Deviation sum of squares	Degrees of freedom	Mean-squared	F-value	value	Significance
Penetration	PPA	18496.5	3	6165.5	22.92	0.001
	Bioasphalt	2280.67	3	760.22	0.47	0.71
	Shear time	660.98	3	220.32	0.13	0.94
	Shear rate	233.6	3	77.87	0.043	0.99
Softening point	PPA	1874.68	3	624.89	23.6	0.001
	Bioasphalt	298.2	3	99.4	0.63	0.61
	Shear time	1.13	3	0.38	0.002	1.0
	Shear rate	17.27	3	5.76	0.032	0.99
Ductility	PPA	51651.66	3	17217.22	3.64	0.045
	Bioasphalt	53115.37	3	17705.12	3.84	0.039
	Shear time	1732.48	3	577.49	0.065	0.98
	Shear rate	784.64	3	261.55	0.029	0.99
Viscosity	PPA	716324.21	3	238774.74	16.89	0.001
	Bioasphalt	135528.28	3	45176.09	0.72	0.56
	Shear time	12019.04	3	4006.35	0.055	0.98
	Shear rate	6950.81	3	2316.94	0.032	0.99

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