RELATIONSHIPS OF HMA IN-PLACE AIR VOIDS, LIFT THICKNESS, AND PERMEABILITY. VOLUMES ONE THROUGH FOUR

This document is a four-volume report that evaluates the minimum hot-mix asphalt (HMA) lift thicknesses and minimum in-place density necessary to achieve an impermeable, durable pavement. The report also evaluates enhancements to American Association of State Highway and Transportation Officials (AASHTO) T166 (Bulk Specific Gravity of Compacted Bituminous Mixtures Using Saturated Surface-Dry Specimens) designed to achieve a precise, uniform, and more accurate determination of the bulk specific gravity of compacted HMA specimens. Volume one examines the minimum thickness to nominal maximum aggregate size (t/NMAS) ratio needed for desirable HMA pavement density levels to be achievable; evaluates the permeability characteristics of compacted samples at different thicknesses; and explores the factors affecting the relationship between in-place air voids, permeability, and lift thickness. Volume two compares the AASHTO T166 with other methods of measuring bulk specific gravity to determine under what conditions AASHTO T166 is accurate, evaluates whether improvements to AASHTO T166 are necessary to achieve a more accurate measure of bulk specific gravity, and examines other methods of measuring bulk specific gravity. Volume three evaluates the relationships between permeability, lift thickness, and in-place density in the field. Volume four contains the appendices of the report.

• Record URL:
  http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w68v1.pdf
• Record URL:
  http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w68v2.pdf
• Record URL:
  http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w68v3.pdf
• Record URL:
  http://onlinepubs.trb.org/onlinepubs/nchrp/nchrp_w68v4.pdf
• Record URL:
  http://www.trb.org/Publications/Blurbs/155185.aspx
• 
• Supplemental Notes:
  • A summary of this report was published as NCHRP Report 531. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved
• Corporate Authors:

  National Cooperative Highway Research Program

  Transportation Research Board
  500 Fifth Street, NW
  Washington, DC  United States  20001
• Authors:
  • Brown, E R
  • Hainin, M R
  • Cooley, A
  • Hurley, G
• Publication Date: 2004-9

Language

• English

Media Info

• Features: Appendices; Figures; References; Tables;
• Pagination: 607 p.
• Serial:
  • NCHRP Web-Only Document
  • Issue Number: 68
  • Publisher: Transportation Research Board

Subject/Index Terms

• TRT Terms: Accuracy; Air voids; Asphalt pavements; Hot mix asphalt; In place density; Permeability; Road construction; Specific gravity; Test procedures; Thickness
• Subject Areas: Construction; Highways; Materials; I31: Bituminous Binders and Materials; I52: Construction of Pavements and Surfacings;

Filing Info

• Accession Number: 00982183
• Record Type: Publication
• Report/Paper Numbers: NCHRP Project 9-27
• Files: TRIS, TRB
• Created Date: Nov 30 2004 12:00AM