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Title:

Full-Scale Structural Characterization of a Highly Polymer-Modified Asphalt Pavement
Cover of Full-Scale Structural Characterization of a Highly Polymer-Modified Asphalt Pavement

Accession Number:

01332909

Record Type:

Component

Abstract:

Polymer modified asphalt mixtures have traditionally been used in upper pavement lifts to enhance rutting performance where temperatures, vertical stresses and shear action are more extreme. However, the need for thinner yet high performing pavement cross sections facilitates the need for higher modulus, fatigue resistant materials in the lower lifts of a flexible pavement. A recently developed asphalt formulation contains 7.5% styrene-butadiene-styrene (SBS) and can be referred to as a high polymer mix (HPM) relative to the more conventional 2 – 3% SBS. Though laboratory and simulation studies conducted on this formulation generally show satisfactory results, there was a need to conduct field trials to evaluate the in situ structural characteristics. To that end, a full-scale section using HPM was constructed at the National Center for Asphalt Technology Test Track. This paper compares structural responses of the HPM relative to a control section under traffic and falling weight deflectometer loading. Higher strain and pressure levels were measured in the HPM section at low (50F) and intermediate (80F) reference temperatures. At the highest reference temperature (110F) no statistical differences in average strain were measured between the HPM and control section, despite the control section being 1.4 inches thicker. This observation was attributed to increased modulus of the HPM at the high reference temperature. Higher stresses were measured in the underlying aggregate base in the HPM section at all reference temperatures which may lead to poorer performance in the aggregate base under the HPM due to higher stress regimes.

Monograph Accession #:

01329018

Report/Paper Numbers:

11-1069

Language:

English

Corporate Authors:

Transportation Research Board

500 Fifth Street, NW
Washington, DC 20001 United States

Authors:

Timm, David H
Robbins, Mary Marjorie
Kluttz, Robert Q

Pagination:

16p

Publication Date:

2011

Conference:

Transportation Research Board 90th Annual Meeting

Location: Washington DC, United States
Date: 2011-1-23 to 2011-1-27
Sponsors: Transportation Research Board

Media Type:

DVD

Features:

Figures; Photos; References (20) ; Tables (1)

Subject Areas:

Highways; Pavements; I22: Design of Pavements, Railways and Guideways

Source Data:

Transportation Research Board Annual Meeting 2011 Paper #11-1069

Files:

PRP, TRIS, TRB

Created Date:

Feb 17 2011 5:40PM