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:
- Summary URL:
-
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