The Use of Volume Increase Ratio for Dense-Graded Mixtures

This paper describes the derivation of a new volumetric parameter called the Volume Increase Ratio (VIR) which is an alternate means of quantifying the asphalt coating on aggregates in asphalt mixtures. In the past, others have attempted to use the approach of applying a minimum average film thickness (AFT) to the surface area of a given aggregate blend to determine the volume of non-absorbed asphalt. Then with a specified volume of air voids, this volume of asphalt can be used to infer the voids in mineral aggregate (VMA) for the mixture. This paper demonstrates the inherent problem in using “assumed” surface areas in this process and instead, uses the concept of VIR. The advantage to this method is that VIR is a physically measured quantity and does not rely on assumed values. The relationship between air voids, VMA, and VIR is established. VIR is independent of air voids and VMA and makes it an improved field control parameter over voids filled with asphalt (VFA). In addition, this paper also describes a new parameter Passing No. 200 to VIR as a more rational measure to replace the existing passing No 200 to effective asphalt ratio. Comparisons are made between VIR and AFT using existing databases from MnROAD and the Iowa DOT. VIR is correlated with performance data from MnROAD. In most cases, VIR is equal to or better than AFT in predicting pavement performance. Comparisons of VIR and AFT for mixtures in Iowa indicate that AFT is of questionable value for fine graded mixtures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Authors:
  • Thompson, Gary O
• Conference:
  • Asphalt Paving Technology 2010
  • Location: Sacramento CA, United States
  • Date: 2010-3-7 to 2010-3-10
• Publication Date: 2010

Language

• English

Media Info

• Media Type: Print
• Features: CD-ROM; Figures; References; Tables;
• Pagination: pp 189-220
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 79
  • 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 pavements; Dense graded aggregates; Mix design; Thickness
• Uncontrolled Terms: Dense graded mixtures; Voids in mineral aggregate
• Geographic Terms: Iowa; Minnesota
• Subject Areas: Highways; Materials; Pavements; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01328014
• Record Type: Publication
• Files: TRIS
• Created Date: Jan 20 2011 11:22AM