Mechanistic–Empirical Evaluation of Aggregate Base and Granular Subbase Quality Affecting Flexible Pavement Performance in Minnesota

Since high-quality aggregate materials are becoming increasingly scarce and expensive, optimizing the use of locally available materials for aggregate bases and granular subbases on the basis of cost and mechanistic properties linked to pavement performance has become an economically viable alternative. This study investigated the effect of quality of unbound aggregate material on conventional flexible pavement performance in Minnesota through a mechanistic–empirical pavement design approach. A comprehensive matrix of conventional flexible pavement layer thicknesses and mechanistic design moduli was carefully designed to conduct mechanistic analyses for the Minnesota Department of Transportation flexible pavement design program (MnPAVE) with the MnPAVE program for pavement sections in two climatic regions in Minnesota. The type and the quality classes of unbound aggregate materials, identified as high, medium, and low, were characterized with stress-dependent resilient modulus (M sub R) models from a statewide laboratory-tested aggregate M sub R database. Despite conventional wisdom to the contrary, in some cases the granular subbase material had much higher moduli than the aggregate base. The typical high, medium, and low modulus values for the aggregate base and granular subbase layers, determined from the modulus distributions predicted by the nonlinear finite element program GT-PAVE, were subsequently input during MnPAVE analyses to calculate fatigue and rutting life expectancies for the comprehensive matrix of pavement structures studied. From the results, use of locally available and somewhat marginal materials may be quite cost-effective for low-volume roads, provided that the 20-year design traffic level does not exceed 1.5 million equivalent single-axle loads. A high-quality, stiff subbase was also found to exhibit a bridging effect that better protected the subgrade and offset the detrimental effects of low base stiffness on rutting performance.

• Record URL:
  https://doi.org/10.3141/2227-11
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Mechanistic%e2%ac%1cEmpirical+Evaluation+of+Aggregate+Base+and+Granular+Subbase+Quality+Affecting+Flexible+Pavement+Performance+in+Minnesota&author=Y.+Xiao&author=E.+Tutumluer&author=J.+Siekmeier&publication_year=2011
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Blurbs/166429.aspx
• Authors:
  • Xiao, Yuanjie
  • Tutumluer, Erol
  • Siekmeier, John
• Publication Date: 2011

Language

• English

Media Info

• Media Type: Print
• Features: Figures; Photos; References; Tables;
• Pagination: pp 97-106
• Monograph Title: Pavement Management 2011, Volume 3
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 2227
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Aggregates; Base course (Pavements); Fatigue (Mechanics); Finite element method; Flexible pavements; Granular materials; Low volume roads; Modulus of resilience; Pavement performance; Rutting; Subbase (Pavements)
• Identifier Terms: Mechanistic-Empirical Pavement Design Guide
• Uncontrolled Terms: Marginal materials
• Geographic Terms: Minnesota
• Subject Areas: Design; Highways; Materials; Pavements; I22: Design of Pavements, Railways and Guideways; I36: Aggregates;

Filing Info

• Accession Number: 01333271
• Record Type: Publication
• ISBN: 9780309167505
• Report/Paper Numbers: 11-3462
• Files: TRIS, TRB, ATRI
• Created Date: Mar 21 2011 2:13PM