Performance of Reinforced Hot Asphaltic Concrete Pavements



Performance of Reinforced Hot Asphaltic Concrete Pavements

Authors

EL REFAEY M, AI Azhar University, Egypt

Description

Usual criterion of structural failure of hot asphaltic concrete pavements is the occurrence of a certain plastic vertical deformation in the nearside wheel track which corresponds to a certain rut depth in the pavement structure. Deformation of this magni

Abstract

Usual criterion of structural failure of hot asphaltic concrete pavements is the occurrence of a certain plastic vertical deformation in the nearside wheel track which corresponds to a certain rut depth in the pavement structure. Deformation of this magnitude is often accompanied by cracking which may be also due to shrinkage, brittle's, and slippage of the pavement layers. Occurrence of both cracking and plastic deformation in hot asphaltic concrete pavements is mainly due to lack of tensile strength of these pavement layers. Thus, the most known and broadly used design methods for dense bituminous pavement layers dictate that the hot asphaltic concrete layers must possess tensile strength in order to resist the plastic deformation as well as cracking. Reinforcement could be used to improve the teasel strength of hot asphaltic concrete pavements. As a result, a substantial material cost saving and/or performance advantages can be realized for the reinforcement of asphaltic concrete in new construction and overlay applications. As a result, a substantial material cost saving and/or performance advantages can be realized for the reinforcement of asphaltic concrete in new construction and overlay applications.

The primary objective of this research is to in,)estigate the possibility of using two types of reinforcing materials in hot asphaltic concrete mixtures and to examine their impact upon the performance of these mixtures. Polypropylene fibers and glass fibers were considered as reinforcing elements. Each type of these reinforcing elements was mixed to the designed hot asphaltic concrete mixes; with different amounts to produce new mixes having different grades of reinforcement. The produced reinforced hot asphaltic concrete mixes were. tested to investigate their physico-mechanical properties. This study also investigates the correlations between both type and amount of reinforcement that was used in hot asphaltic concrete mixtures, and the performances of these of these mixtures. However, polypropylene fibers exhibit better performance than the glass fibers do. Workability of these reinforcing elements and their optimum contents in hot asphaltic concrete mixtures were also discussed.

Publisher

Association for European Transport