Functional performance and microstructural properties of porous asphalt subjected to clogging

Porous asphalt is designed with high air voids that increases the voids interconnectivity to improve permeability and sound absorption. However, after few years in service, these functional performances become ineffective due to clogging. Due to high air voids, debris and dust from moving vehicles a...

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Main Author:	Mahmud, Mohd. Zul Hanif
Format:	Thesis
Language:	English
Published:	2020
Subjects:	TA Engineering (General) Civil engineering (General)
Online Access:	http://eprints.utm.my/id/eprint/92172/1/MohdZulHanifMSKA2019.pdf.pdf
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id	my-utm-ep.92172
record_format	uketd_dc
spelling	my-utm-ep.921722021-08-30T04:22:51Z Functional performance and microstructural properties of porous asphalt subjected to clogging 2020 Mahmud, Mohd. Zul Hanif TA Engineering (General). Civil engineering (General) Porous asphalt is designed with high air voids that increases the voids interconnectivity to improve permeability and sound absorption. However, after few years in service, these functional performances become ineffective due to clogging. Due to high air voids, debris and dust from moving vehicles and surface runoff tend to clog the voids structure. This research investigates the effect of clogging on the functional performances and microstructural of porous asphalt. Initially, a comprehensive laboratory procedure with different variables (cycles, materials, concentrations) was established to characterise the clogging potential. Then, the changes in voids properties due to internal clogging were investigated using X-ray Computed Tomography scanner and imaging technique for microstructural characterisation. Detailed image analysis procedure was developed and verified with the volumetric properties of the mix. The functional performances such as permeability, sound absorption and skid resistance of the porous asphalt were then evaluated under various clogging conditions. Based on the microstructure analysis, repeated clogging cycles have densified the top region of porous asphalt and changed the air voids structure as well as the voids interconnectivity. This has caused reduction in water permeability as more time is needed for water to permeate through the voids channel. The results also suggest clogging phenomenon reduces the sound absorbing capabilities in the porous structure particularly at high frequency due to excessive energy attenuation. For frictional performance, deposition of clogging particles on the pavement surface has changed the properties of the macro and micro-texture as indicated by the difference in British Pendulum Number (BPN) under dry and wet conditions. Overall, these results suggest that clogging phenomenon is an important factor affecting the functional performance and microstructure of porous asphalt. 2020 Thesis http://eprints.utm.my/id/eprint/92172/ http://eprints.utm.my/id/eprint/92172/1/MohdZulHanifMSKA2019.pdf.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:134379 phd doctoral Universiti Teknologi Malaysia Faculty of Engineering - School of Civil Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TA Engineering (General) Civil engineering (General)
spellingShingle	TA Engineering (General) Civil engineering (General) Mahmud, Mohd. Zul Hanif Functional performance and microstructural properties of porous asphalt subjected to clogging
description	Porous asphalt is designed with high air voids that increases the voids interconnectivity to improve permeability and sound absorption. However, after few years in service, these functional performances become ineffective due to clogging. Due to high air voids, debris and dust from moving vehicles and surface runoff tend to clog the voids structure. This research investigates the effect of clogging on the functional performances and microstructural of porous asphalt. Initially, a comprehensive laboratory procedure with different variables (cycles, materials, concentrations) was established to characterise the clogging potential. Then, the changes in voids properties due to internal clogging were investigated using X-ray Computed Tomography scanner and imaging technique for microstructural characterisation. Detailed image analysis procedure was developed and verified with the volumetric properties of the mix. The functional performances such as permeability, sound absorption and skid resistance of the porous asphalt were then evaluated under various clogging conditions. Based on the microstructure analysis, repeated clogging cycles have densified the top region of porous asphalt and changed the air voids structure as well as the voids interconnectivity. This has caused reduction in water permeability as more time is needed for water to permeate through the voids channel. The results also suggest clogging phenomenon reduces the sound absorbing capabilities in the porous structure particularly at high frequency due to excessive energy attenuation. For frictional performance, deposition of clogging particles on the pavement surface has changed the properties of the macro and micro-texture as indicated by the difference in British Pendulum Number (BPN) under dry and wet conditions. Overall, these results suggest that clogging phenomenon is an important factor affecting the functional performance and microstructure of porous asphalt.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Mahmud, Mohd. Zul Hanif
author_facet	Mahmud, Mohd. Zul Hanif
author_sort	Mahmud, Mohd. Zul Hanif
title	Functional performance and microstructural properties of porous asphalt subjected to clogging
title_short	Functional performance and microstructural properties of porous asphalt subjected to clogging
title_full	Functional performance and microstructural properties of porous asphalt subjected to clogging
title_fullStr	Functional performance and microstructural properties of porous asphalt subjected to clogging
title_full_unstemmed	Functional performance and microstructural properties of porous asphalt subjected to clogging
title_sort	functional performance and microstructural properties of porous asphalt subjected to clogging
granting_institution	Universiti Teknologi Malaysia
granting_department	Faculty of Engineering - School of Civil Engineering
publishDate	2020
url	http://eprints.utm.my/id/eprint/92172/1/MohdZulHanifMSKA2019.pdf.pdf
_version_	1747818573285294080

Functional performance and microstructural properties of porous asphalt subjected to clogging

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