A Practical Look at the Simple Performance Tests: Louisiana's Experience (With Discussion)

The Superpave volumetric mix design procedure developed during the Asphalt Research Program of the Strategic Highway Research Program did not include a mechanical “proof” test similar to the ones commonly used in the Marshall mix design or Hveem mix design such as the Marshall stability and flow tests or the Hveem stabilometer method, respectively. The Superpave mix design method, however, did use strict requirement to material specifications and volumetric mix criteria to ensure satisfactory performance of mix designs that were intended for low volume traffic. In addition, the original Superpave mix design protocol required mix verification for intermediate and high volume traffic through advanced materials characterizations tests utilizing the Superpave Shear Tester test protocols. It was quickly recognized the complexity of those test protocols for routine mix design application and that a simple performance test is needed to complement the Superpave volumetric mix design procedure. In response to this need, National Cooperative Highway Research Program (NCHRP) Project 9-19, Superpave Support and Performance Models Management, recently recommended three candidate Simple Performance Tests (SPTs) to complement the Superpave volumetric mixture design method. These are flow time (FT), flow number (FN), and dynamic modulus |E*| tests. In addition, the dynamic modulus test was selected for the hot mix asphalt (HMA) materials characterization input utilized in the 2002 Empirical and Mechanistic Guide for Design of New and Rehabilitated Pavement Structures, developed under NCHRP Project 1-37A. This paper presents a practical look at the results of a cooperative evaluation of similar Superpave mixtures utilizing two tests of the SPTs: the Dynamic Modulus and Flow Number. Two different dynamic modulus predictive models, Witczak and Hirsch, were also evaluated.

• Availability:
  • Find a library where document is available. Order URL: http://worldcat.org/oclc/70700638
• Authors:
  • Mohammad, Louay N
  • Wu, Zhong
  • Myers, Leslie
  • Cooper, Sam
  • Abadie, Christopher
• Discussers:
  • Chehab, Ghassan R
  • Davis, Richard
• Conference:
  • 2005 Journal of the Association of Asphalt Paving Technologists: From the Proceedings of the Technical Sessions
  • Location: Long Beach CA, United States
  • Date: 2005-3-7 to 2005-3-9
• Publication Date: 2005

Language

• English

Media Info

• Media Type: Print
• Features: CD-ROM; Figures; Photos; References; Tables;
• Pagination: pp 557-600
• Serial:
  • Journal of the Association of Asphalt Paving Technologists
  • Volume: 74
  • 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 mixtures; Chemical stability; High volume roads; Hveem stabilometer; Low volume roads; Mechanical tests; Mix design; Performance tests; Superpave; Volumetric analysis
• Uncontrolled Terms: Dynamic modulus test; Flow number test; Flow time test; Hirsch model; Hveem mix design; Marshall mix design; Witczak model
• Geographic Terms: Louisiana
• Subject Areas: Highways; Materials; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01020741
• Record Type: Publication
• Files: TRIS
• Created Date: Mar 27 2006 11:07AM