Constructing the Dynamic Modulus Mastercurve Using Impact Resonance Testing

This paper presents a laboratory study that was designed to refine the impact resonance (IR) test to measure the dynamic modulus (|E*|) and the phase angle (φ) of hot-mix asphalt (HMA). The paper presented analytical solutions for the determination of the |E*| and φ from the IR test and verified the solutions at high reduced frequencies (i.e., low temperatures) using typical North Carolina mixtures. They recommended investigating a wider range of temperatures to further define the |E*| mastercurve. Also, they found that shift factors must be known beforehand to produce the mastercurve. The goals of this study are to investigate the ability of the IR test to determine the |E*| and φ at a wider range of temperatures and verify the use of binder shift factors to shift the IR |E*| values to form a partial mastercurve. The experiments show that IR tests can be performed from 5° to 60°C to produce the higher reduced frequency portion of the mastercurve. The results show that using averaged or measured binder shift factors to shift |E*| data obtained from IR tests produces |E*| values at higher reduced frequencies that are not statistically different from the TP 62 |E*| protocol. Also, the IR test performs well with different nominal maximum sized aggregates, binders, specimen dimensions, and operators. However, it is found that the accurate construction of the entire mastercurve requires another means of estimating |E*| values at low reduced frequencies (i.e., high temperatures). The adoption of Witczak’s |E*| predictive equation for the |E*| values at 54.4°C shows that the predictive equation affects the mastercurve construction quite significantly, which can cause possible errors in predicting the |E*| at different temperatures and frequencies associated with a typical range of pavement responses. These errors affect the predictions of performance models for cracking and rutting because the models use estimates of the pavement response, which is calculated using the |E*| of the pavement materials. Finally, recommendations are made to improve the IR test procedure so that it is suitable for quality control (QC) and quality assurance (QA) of HMA mixtures.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/issn/02702932
• Authors:
  • LaCroix, Andrew
  • Kim, Y Richard
  • Sadat, Maryam
  • Far, Sakhaei
• Conference:
  • Asphalt Paving Technology 2009
  • Location: Minneapolis MN, United States
  • Date: 2009-3-15 to 2009-3-18
• Publication Date: 2009

Language

• English

Media Info

• Media Type: Print
• Features: CD-ROM; Figures; Photos; References; Tables;
• Pagination: pp 67-102
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 78
  • 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: Aggregates; Binders; Cracking; Dynamic modulus of elasticity; Hot mix asphalt; Pavement performance; Quality assurance; Quality control; Resonance; Rutting
• Uncontrolled Terms: Impact resonance method; Master curves
• Subject Areas: Highways; Materials; I33: Other Materials used in Pavement Layers;

Filing Info

• Accession Number: 01158693
• Record Type: Publication
• Files: TRIS
• Created Date: Jun 11 2010 12:05PM