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Effect of Pavement Layers Properties on Optimum Performance by Mechanistic–Empirical Method | ||
| Journal of University of Babylon | ||
| Article 1, Volume 23, Issue 2, 2015, Pages 290-297 | ||
| Author | ||
| Ahmed Abbas Jasim | ||
| Abstract | ||
| Premature failure of flexible pavements has been a long problem in many Iraqi roads in middle and south areas with the drastic increase in truck axle loads specially after year 2003. To fully utilize each pavement material in an economic design, a pavement should generally have reasonably balanced design between the rutting and fatigue modes of distress. The purpose of this paper is to develop a methodology for achieving a reasonable balance between fatigue and rutting lives of flexible pavements. The methodology is based on the damage analysis concept which is performed for both fatigue cracking and rutting on different pavement sections using KENLAYER program. The investigated pavement components are; thickness and elasticity modulus for pavement layers. The results of pavement analysis showed that thickness of base layer and elasticity modulus of subbase layer are the key elements which control the equilibrium between fatigue and rutting lives respectively. That is because, increasing thickness of base layer and elasticity modulus of subbase layer sharply increases rutting lives, and don't affect in fatigue lives. The study also concluded that, increasing thickness of surface layer significantly increases pavement lives, while increasing elasticity modulus of surface and base Layers mildly increases pavement lives. | ||
| Keywords | ||
| Pavement life; Tensile Strain; and Compressive strain | ||
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