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Thermal Effects on Elastic and Rigidity Modulus of Flexible Pavement Wearing Course

Enwuso Igwe, Daniel Azeruibe Nyebuchi

Abstract


Laboratory investigation of flexible pavement was carried out using asphalt concrete samples to simulate the behaviour of actual field conditions of a flexible pavement. The study was carried out in order to ascertain the changes that will result in the elastic and rigidity (shear) modulus of flexible pavement when subjected to increasing temperature conditions (thermal effect). The study became pertinent because mechanistic design of flexible pavement requires as input the determination of stiffness and strains of the pavement for accurate design. However, for purpose of the present study stiffness was limited to elastic and rigidity modulus. Samples were prepared for three categories of traffic and subjected to increasing temperature differentials of 20–60°C. The results obtained revealed that under increasing temperature viscosity of the binder (asphalt cement) is greatly reduced thereby reducing cohesion of the composite mix for all categories of traffic considered. In addition, the reduction in viscosity negatively affected the stiffness (bonding of asphalt cement with aggregates) behaviour of the pavement which directly influenced the reduction of both the elastic and rigidity modulus of the pavement for all categories of traffic under study.

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References


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DOI: https://doi.org/10.37628/jtets.v3i2.191

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