Research Article
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 | |
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≤ 0.1 is generally significant. ≤ 0.05 is significant. ≤ 0.001 is particularly significant. |