Study of the performance of porous asphalt mixture for urban roads

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Study of the performance of porous asphalt mixture for urban roads


Author: Yu, Zehui
Title: Study of the performance of porous asphalt mixture for urban roads
Degree: M.Sc.
Year: 2014
Subject: Pavements, Asphalt
Porous materials.
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Construction and Environment
Pages: vi, 51 leaves : illustrations ; 30 cm
Language: English
InnoPac Record:
Abstract: Porous asphalt pavements have received increasing attention all around the world and they are expected to solve the issues of skidding, hydroplaning, spraying, noise and mirror effect at night. However the lower durability of porous asphalt mixture is a serious problem and it affects the service life of pavements. The objective of this study is to evaluate the influence of the properties of asphalt binders (Pen 60/70, PG 76 and rubber asphalt) and air void contents (18% and 20%) on the durability of porous asphalt. These evaluations were based on binder properties (penetration, ductility and softening point) tests, mixture density test, Marshall stability test and rutting test. The results compared properties of three different binders and evaluated performance of mixtures with different binders and air void contents. It was found that PG 76 binder and rubber asphalt binder had better thermostability than Pen 60/70 and the addition of crumb rubber can decrease the penetration of asphalt binder and increase the softening point. In addition, porous asphalt mixture with PG 76 had the best performance on resisting compressive load and rutting, followed by that with rubber asphalt. These two binders have improved the durability of porous asphalt mixtures. Moreover, air void content played an important role on mixture property. Mixture with 18% air void content exhibited better performance on high temperature stability and rutting resistance than that with 20% air void content. In other words, lower air void content can extent the lifetime of porous asphalt mixture.

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