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Title:

Modification of Louisiana’s Asphalt Binder Specifications Using the Multiple Stress Creep Recovery Test

Accession Number:

01663322

Record Type:

Component

Abstract:

The Multiple Stress Creep Recovery (MSCR) test was introduced in 2011 to measure performance of modified asphalt binders and address shortcomings of using G*/Sind alone. As a result of an implementation study by the Louisiana Transportation Research Center (LTRC), the MSCR test was adopted into Louisiana specifications to replace PG-plus tests and to provide high temperature performance measurements of asphalt binders. The specifications required modified (m) PG 70-22m and PG 76-22m asphalt binders to pass a maximum non-recoverable creep compliance and to pass the MSCR curve. However, since implementation of the new specifications, PG 70-22m asphalt binders required heavy modification to meet the MSCR curve for Louisiana. Furthermore, there were scarce noted performance issues (rutting) with PG 70-22m asphalt binder under the PG-Plus specifications. This research was tasked to review the current PG 70-22m binder specifications as well as several previously accepted asphalt binders that were unable to pass the newly implemented MSCR specifications. Historic data and currently supplied PG 70-22m asphalt binders were evaluated. Additionally, with the increase of non-SBS modifiers (e.g. latex, crumb rubber, plastomeric polymers) available for asphalt binder modification, an evaluation of MSCR specification limits was needed. This study concluded that PG 70-22m binder specifications were inconsistent with the observed performance of mixtures containing PG 70-22m asphalt binder and adjustments were warranted. The authors recommended an adjustment of current PG 70-22m binder specifications by lowering percent recovery to 15% minimum and creating a range for non-recoverable creep compliance of 1.0 - 2.0 kPa-1 at 3.2 kPa.

Supplemental Notes:

This paper was sponsored by TRB committee AFK20 Standing Committee on Asphalt Binders.

Report/Paper Numbers:

18-05723

Language:

English

Authors:

Mata, David
Salari, Saman
Cooper, Samuel B

Pagination:

6p

Publication Date:

2018

Conference:

Transportation Research Board 97th Annual Meeting

Location: Washington DC, United States
Date: 2018-1-7 to 2018-1-11
Sponsors: Transportation Research Board

Media Type:

Digital/other

Features:

Figures; References

Identifier Terms:

Multiple Stress Creep Recovery

Subject Areas:

Highways; Materials; Pavements

Source Data:

Transportation Research Board Annual Meeting 2018 Paper #18-05723

Files:

TRIS, TRB, ATRI

Created Date:

Jan 8 2018 11:28AM