Performance of Porous Asphalt Concrete

Because of its noise reducing capacity, porous asphalt concrete is commonly used nowadays in the Netherlands for wearing courses on highways. Traditionally a single layer of porous asphalt concrete (PAC) (gradation 6/16 mm) is applied with a thickness of 50 mm. Investigations however have shown that double layer PAC, consisting of a 30 mm top layer of fine graded (2/6 or 4/8 mm) PAC on top of 50 mm coarse graded (11/16 mm) PAC, have better noise reducing capabilities. These mixtures are therefore going to be used on a large scale on highways in densely populated areas. The lifetime of PAC shows a large variation and in order to keep the maintenance costs under control, measures are sought to extend the mean lifetime and to reduce the variation there in. More and more it is believed that the lifetime of PAC and its variation are strongly influenced by the construction process. A study was therefore undertaken to determine to what extent the development of the main defect type, being raveling, is determined by the composition of the mixture as laid and factors like traffic and climate. For this, the PAC sections in the SHRP-NL database were analyzed by means of Artificial Neural Network techniques (the SHRP-NL data base only contained information on single layer PAC). This study revealed that the quality of the mixture as laid has a very large influence on the performance of the mixture and it was shown e.g. that bitumen contents lower than 4% should not be accepted. Also siliceous river gravel should not be used. Furthermore a study was undertaken to determine to what extent the initial quality of single layer PAC was influenced by the working conditions. For this a particular paving job was intensively monitored and it appeared that the composition of the mixture as laid is highly variable. From the data an equation could be developed that relates the void content, being of PAC, to mixture composition, temperature of the mixture and compaction effort. Finally research was done on double layer PAC. This double layer offers a better reduction in traffic noise than the conventional single layer PAC but problems may arise with the permeability because of a low void content in the interface between top and bottom layer. It will be shown that selection of the gradation is of prime importance for noise reduction and permeability purposes and an optimal gradation for both layers will be proposed.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Supplemental Notes:
  • This paper is only available on the CD-ROM located in the back of the hardcopy volume.
• Authors:
  • Molenaar, A A A
  • Meerkerk, AJJ
  • Miradi, M
  • van der Steen, T
• Conference:
  • 2006 Journal of the Association of Asphalt Paving Technologists: From the Proceedings of the Technical Sessions
  • Location: Savannah Georgia, United States
  • Date: 2006-3-27 to 2006-3-29
• Publication Date: 2006

Language

• English

Media Info

• Media Type: CD-ROM
• Features: Figures; References; Tables;
• Pagination: pp 1053-1094
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 75
  • Publisher: Association of Asphalt Paving Technologists (AAPT)
  • ISSN: 0270-2932
  • Serial URL: https://www.asphalttechnology.org/site_page.cfm?pk_association_webpage_menu=9169&pk_association_webpage=19109

Subject/Index Terms

• TRT Terms: Asphalt concrete pavements; Asphalt content; Bituminous mixtures; Coarse aggregates; Compaction; Databases; Equations; Fine aggregates; Highways; Materials selection; Neural networks; Noise control; Pavement layers; Pavement performance; Paving; Porous materials; Service life; Stripping (Pavements); Temperature; Wearing course (Pavements)
• Identifier Terms: SHRP-NL
• Uncontrolled Terms: Double layer; Mixture composition; Quality; Siliceous river gravel
• Geographic Terms: Netherlands
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01041399
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 30 2007 1:29PM