Prediction of Fatigue and Rutting Premature Distress in Linear layered Flexible Pavements for Different Loading Condition using the Mechanistic-Empirical Method
The research aims to study and analyze the damage to asphalt roads and load change based on (KENPAVE) program by evaluating the performance of flexible pavement using the Mechanistic-Empirical Method (M-E). A multilayered structure for flexible pavement was assumed with load ratios of 50%,...
| Main Authors: | , , |
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| Format: | Article |
| Language: | Arabic |
| Published: |
University of Sulaimania
2021-08-01
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| Series: | Sulaimani Journal for Engineering Sciences |
| Subjects: | |
| Online Access: | https://sites.google.com/a/univsul.edu.iq/sjes/issues/vol8no1/sjes-10146 |
| Summary: | The research aims to study and analyze the damage
to asphalt roads and load change based on
(KENPAVE) program by evaluating the
performance of flexible pavement using the
Mechanistic-Empirical Method (M-E). A multilayered structure for flexible pavement was assumed
with load ratios of 50%, 100%, 150%, and 200% of
the standard load according to Iraqi specifications.
Depend on horizontal tensile strain at the bottom of
asphalt layers to estimate the fatigue failure and on
the vertical compressive strain above soil layers to
estimate the rutting failure. Analysis of the results
showed that the highest values of vertical stress
were on the single axle in the wearing layer with a
value of (639.753 KPa) for standard load, and the
raising of load increased the pressure distributed by
the vehicle to the pavement so that the tensile and
compressive strain was higher. However, the lower
tensile and compressive strain values increased both
(Nf and Nr). The highest tensile strain values among
the layers occurred at asphalt stabilized base coarse
of the single axle of (-1.5*10-4) for the standard load.
While the highest compressive strain values exist at
the top of the subbase layer of the single axle with
dual tires of (4.761*10-4) for the standard load. It
was also observed that the increasing of axle loads
produces an increase in the vertical displacement of
the pavement, where the deformation value on the
wearing layer of the tandem axle is (0. 8998 mm) for
standard load, and that (84%) of this deformation
was in the subgrade layer. However, the highest
value of damage ratio was existing at the asphalt
stabilized base coarse with a value of (0.04426) at
standard load. It was also found that the design life
decreases by 9 times when increasing the load twice
the standard load, which in turn reduces the paving
efficiency. |
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| ISSN: | 2410-1699 2415-6655 |