Time (sec) Stiffness S(t) m-value MPa Deflection (mm) 0.1877 8. 15 0.2231 30 0.2730 60 0.3364 120 0.4152 240 0.5327
The following data are recorded from a Bending Beam Rheometer test on asphalt binder:
• Test temperature = - 1 8.0°C
• Beam width = 12.70 mm
• Beam Thickness = 6.35 mm
• Distance between beam support = 102 mm.
Assuming the load and length of the beam are constants throughout the test:
a) Plot the relationship between deflection and time.
b) Plot the relationship between stiffness S(t) and time (t) on a logarithmic scale.
c) Fit a second degree polynomial regression equation to the Log(S(t)) Vs. Log(t)
relationship established in part (b) above.
d) Use the regression equation to find the rate at which the creep stiffness changes with
loading (m(t)) at the time increments shown in the above table.
e) Demonstrate whether this asphalt meets the Superpave requirements for low temperature
cracking or not.
Please show all work and explanation
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