Evaluation of the Effect of Lime Modification on the Dynamic Modulus Stiffness of Hot-Mix Asphalt: Use with the New Mechanistic–Empirical Pavement Design Guide

Hydrated lime is often used as a mineral filler or antistripping additive in hot-mix asphalt (HMA). Many agencies across North America require the use of lime in all HMA mixtures being placed on high-volume roadways. Despite this wide use of lime, its effects on the HMA mixture dynamic modulus (E*) stiffness have rarely been evaluated. The new mechanistic–empirical (M-E) pavement design guide, "Guide for Mechanistic–Empirical Design of New and Rehabilitated Pavement Structures," developed under NCHRP Project 1-37A uses E* as the primary material property of asphalt mixtures for the HMA characterization. A comprehensive study was completed at Arizona State University to assess the effect of lime addition on the E* stiffness of HMA mixtures. The study demonstrated that the standard test and design methodologies of the new M-E pavement design guide could be used effectively for lime-modified HMA mixes. With these methodologies, hydrated lime was found to increase the E* of HMA mixtures by 17% to 65% across the range of mixtures, lime contents, and temperature, with an overall average of 25% increase found from 17 mixture–lime percentage combinations across six different HMA mixes. This paper also outlines a provisional protocol for evaluating the E* master curve for lime-modified HMA mixtures using any of the three hierarchical levels found in the new NCHRP Project 1-37A pavement design guide.

• Record URL:
  https://doi.org/10.3141/1929-02
• 
• Summary URL:
  http://scholar.google.com/scholar_lookup?title=Evaluation+of+the+Effect+of+Lime+Modification+on+the+Dynamic+Modulus+Stiffness+of+Hot-Mix+Asphalt%3a+Use+with+the+New+Mechanistic%e2%ac%1cEmpirical+Pavement+Design+Guide&author=J.+Bari&author=M.+Witczak&publication_year=2005
• Availability:
  • Find a library where document is available. Order URL: http://www.trb.org/Main/Public/Blurbs/157348.aspx
• Authors:
  • Bari, Javed
  • Witczak, Matthew
• Publication Date: 2005

Language

• English

Media Info

• Media Type: Print
• Features: Figures; References; Tables;
• Pagination: pp 10-19
• Monograph Title: Bituminous Paving Mixtures 2005
• Serial:
  • Transportation Research Record: Journal of the Transportation Research Board
  • Issue Number: 1929
  • Publisher: Transportation Research Board
  • ISSN: 0361-1981

Subject/Index Terms

• TRT Terms: Asphalt mixtures; Calcium hydroxide; Calcium oxide; Dynamic modulus of elasticity; Hot mix asphalt; Mechanistic design; Stiffness; Test procedures
• Subject Areas: Highways; Materials; Pavements; I31: Bituminous Binders and Materials;

Filing Info

• Accession Number: 01020630
• Record Type: Publication
• ISBN: 0309094038
• Files: TRIS, TRB, ATRI
• Created Date: Mar 23 2006 9:19AM