Abstract
Inadequate bitumen content in porous pavement construction may result in incomplete coating of aggregates which a thin bitumen film can oxidize rapidly resulting in premature failure of the pavement. This and presents the effects of porous asphalt prepared with 4.0% and up to 6.0% binder content with 0.5% increments binder. Bitumen penetration grade 60/70 and crushed granite were used in preparing the porous asphalt specimen. The porous asphalt mixes were compacted by applying 50 blows on each face using a Marshall Impact compactor. The specimens were tested for air voids, indirect tensile strength and water permeability and abrasion loss. The moisture sensitivity was assessed according to the AASHTO T283 procedures. The result shows that the increasing of bitumen content has decreased the, bulk density air voids, coefficient of permeability and abrasion loss values However, the Indirect Tensile Strength (ITS) has significantly increased and this is a good indication to resistance against moisture sensitivity. It can be concluded that the increasing of bitumen content in porous asphalt has increased the thickness of binder coating around the aggregates. This results reduction in air voids and water permeability, on the other hands it increases resistance to disintegration and ITS value which give better resistance to moisture sensitivity of porous specimens.
Highlights
Porous asphalt is described as a bituminous bound mix with selected grading and high-quality aggregates to provide asphalt mix typically in excess of 20% air voids
By increasing the bitumen content from 4 to 6%, the Gmb of the porous specimen are increased by 0.7%, in contrast the air voids decreased by 40.1%, respectively
This might due to the higher binder content contributes to thicker binder films, this leads to increase in densification of the mix and increases the air voids values
Summary
Porous asphalt is described as a bituminous bound mix with selected grading and high-quality aggregates to provide asphalt mix typically in excess of 20% air voids. The open structure of porous asphalt allows quick drainage of water from the road surface during wet weather. Inefficient drainage system can result in hydroplaning which is dangerous to fast moving traffic This can reduce contact between tyre and pavement, leading to the loss control of braking and steering during driving (Aman and Hamzah, 2014a). For this reason, the introduction of porous asphalt provides effective solution to address some of the engineering related setback experienced by road users. Porous asphalt is widely used for water drainage and noise reduction to improve traffic safety and driving comfort. The wet weather driving conditions have been improved since the water drained through the porous structure, avoiding standing water on the road surfaces
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