Effect of Clogging and Cleaning on the Air Void Microstructure of Porous Asphalt Concrete
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 8
Abstract
Porous asphalt concrete (PAC) is a low-impact medium with strong stormwater management capabilities. However, the air voids inside the PAC mixture will gradually be clogged due to sediment entering the interior of the PAC pavement in the service period. Meanwhile, the permeability of PAC pavements can be partially restored using cleaning equipment. This study investigates the changes in microscopic void characteristics of PAC under the effect of clogging and cleaning. Three kinds of PAC specimens with different void content were clogged by aeolian sand and cleaned by high-pressure water washing after complete clogging, in which the air void content, the shape parameters (roundness and aspect ratio), number, equivalent diameter, fractal dimension of air voids for the PAC mixes were quantified by X-ray computed tomography (CT) and image processing techniques before and after clogging and cleaning. Moreover, a relationship between air void microparameters and measured air void content (volume method) was established. It was found that air void shape, air void content, air void number, and equivalent diameter had a significant impact on the clogging and cleaning effect of PAC pavement, but the fractal dimension did not have a considerable impact. The migration depth of the clogging material increased gradually with the increase of air void content, and the most severe clogging was at about 10 mm from the top surface. The air void number within 1 mm increased significantly due to particle clogging. Before the construction of the road, some microscopic void parameters of PAC will be predicted from air void content measured by volume method, and combined with the results of local clogging particle size distribution, a reasonable PAC gradation will be selected to generate much larger voids than the clogging particles to improve the anticlogging performance of PAC pavement.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The authors gratefully acknowledge financial support from the National Natural Science Foundation of China (51668038). Special thanks are given to the Key Laboratory of Road and Traffic Engineering of the Ministry of Education (Tongji University) for providing the facility for X-ray CT.
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Information & Authors
Information
Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Oct 4, 2023
Accepted: Jan 23, 2024
Published online: May 23, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 23, 2024
ASCE Technical Topics:
- Air pollution
- Air quality
- Asphalt concrete
- Composite materials
- Concrete
- Earth materials
- Engineering materials (by type)
- Environmental engineering
- Fiber reinforced composites
- Geomaterials
- Geomechanics
- Geotechnical engineering
- Infrastructure
- Lightweight concrete
- Materials engineering
- Particle size distribution
- Pavements
- Pollution
- Porous media
- Rock mechanics
- Transportation engineering
- Voids
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