Development of Computer Program for Structural analysis of Flexible Pavement

Batool Abd Al-elah Aziz, Nada Mahdi Fawzi

Abstract


Abstract
The main objective of this study is evaluating the distresses (rutting and fatigue) happened in the pavement and determines the effect of several parameters on pavement. This study includes two steps, First experimental work to compute stiffness, rutting parameters and fatigue parameters of three asphaltic layers. Second, was a computer program developed by visual basic languish to evaluating the sensitivity of several parameters (resilient modulus, thickness of layer) on the rutting resistance and fatigue life. Asphalt concrete mixtures, were prepared for three asphaltic layers (wearing, binder and base ), mixture in this study have been subjected to the following tests: marshal test, resilient modulus test at (20ᵒC and 45ᵒC), permanent deformation under repeated load test at( 45ᵒC) and repeated flexural beam fatigue test at (20ᵒC). From the result of experimental work and developed computer program it was found that 2 cm decrease of wearing course thickness cause (2.2%, 5.2%) decrease of fatigue life and rutting resistance, while 2 cm decrease of binder course thickness cause (2.868%, 2.107%) decrease of fatigue life and rutting resistance, decreasing of base course thickness 2 cm cause (3.14%, 1.53%) decrease of fatigue life and rutting resistance respectively. Also it found that decrease of wearing course resilient modulus 5000 psi decrease fatigue life and rutting resistance about (4.58% and 8.723%) respectively, decrease binder resilient modulus 5000 psi cause decrease fatigue life and rutting resistance about (5.836% and 7.159%) and decreasing of base layer resilient modulus from 5000 psi decrease fatigue life and rutting resistance about (6.766% and 3.32%) respectively.

Keywords: asphalt concrete, fatigue life, mechanistic-empirical design method, rutting resistance

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References


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DOI: https://doi.org/10.37628/jsea.v1i2.58

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