Reduced Testing Procedure for Determining the Dynamic Modulus of Hot-Mix Asphalt

In the mechanistic-empirical (M-E) flexible pavement design procedure developed in National Cooperative Highway Research Program (NCHRP) Project 1-37A, the dynamic modulus (|E*|) is an important input for the asphalt layer. The design procedure provides three levels for |E*| inputs depending upon the importance of the pavement in service. Level 1 |E*| input requires the full |E*| dataset measured at five temperatures and six frequencies, as specified in AASHTO TP62-03, to develop the subsequent master curve for the structural pavement analysis. However, the test results overlap each other. In addition, the testing at extremely low temperature of -10 degrees C significantly increases the purchasing and operating cost of the environmental chamber, and it is difficult due to ice formation around the displacement measurement devices. Extensive analyses using the |E*| results of 42 sets of three replicates in Arkansas showed that the test sequence could be reduced to four temperatures and four frequencies. The testing sequence can be further simplified for routine determination of |E*| testing for pavement structural design. This sequence requires the laboratory measured |E*| values at three temperatures and the predicted |E*| values at -10 degrees C. Compared to full |E*| datasets, the corresponding reduced |E*| datasets for routine determination of |E*| can produce comparable master curves and similar predicted pavement performance using the Mechanistic-Empirical Design Guide (MEPDG) software. For the covering abstrac of this conference see ITRD number E215163.

• Corporate Authors:

  International Society for Asphalt Pavements

  4711 Clark Avenue, Suite G
  White Bear Lake, MN  United States  55110
• Authors:
  • TRAN, N
  • Hall, K
• Conference:
  • 10TH INTERNATIONAL CONFERENCE ON ASPHALT PAVEMENTS - AUGUST 12 TO 17, 2006, QUEBEC CITY, CANADA
• Publication Date: 2006

Language

• English

Media Info

• Media Type: Print
• Pagination: p. vol2,133-42
• Monograph Title: 10th International Conference on Asphalt Pavements - August 12 to 17, 2006, Quebec City, Canada

Subject/Index Terms

• TRT Terms: Conferences; Hot coated materials; Mix design; Modulus; Test procedures; Viscoelasticity
• Geographic Terms: Canada
• Subject Areas: Design; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01084381
• Record Type: Publication
• Source Agency: Transportation Association of Canada (TAC)
• Files: TAC
• Created Date: Jan 15 2008 11:40AM