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https://nap.nationalacademies.org/catalog/27432/critical-issues-in-transportation-for-2024-and-beyond

Evaluation of the MSCR Test for Modified Binder Specification

The Multiple Stress Creep and Recovery (MSCR) test has been introduced as a better test to evaluate modified binders and estimate their role in pavement performance. The non-recoverable creep compliance and the percent recovery are two of the parameters being calculated from the measured strain under different stress cycles. This study consists of two parts. The first compares the MSCR results of testing more than 30 binders modified with elastomeric and plastomeric polymers, crumb rubber, and acids, with conventional testing methods such as the elastic recovery and presents analysis of relationship between tests. The first part also looks at the fatigue of binders and evaluates if the Elastic Recovery or the MSCR test can provide a hint about overall binder behaviour. The second part of the study is focused on some of the challenges when using the MSCR test, including the variability of the test results, between testing devices, and between laboratories. In this part the data collected recently by the Western Cooperative Testing Group (WCTG) of the Rocky Mountain Asphalt User Producer Group from more than 50 laboratories is used. The study concludes with specific recommendation regarding the use of MSCR results and their relationship to asphalt mixture performance. // Le test fluage et de recuperation a contraintes multiples (MSCR) a ete introduit comme un meilleur test pour evaluer des liants modifies et estimer leur role dans la performance de la chaussee. La conformite du fluage non recuperable et le pourcentage de recuperation sont deux des parametres etant calcules a partir de la deformation mesuree sous differents cycles de contrainte. Cette etude se compose de deux parties. La premiere partie compare les resultats de la MSCR des tests plus de 30 liants modifies avec elastomeres et polymeres elastoplastomeres, caoutchouc granulaire et acides avec des methodes d'essai conventionnelles telles que la recuperation elastique et presente l'analyse de la relation entre les essais. Aussi, la premiere partie se penche sur la fatigue des liants et evalue si la recuperation elastique ou le test MSCR peut fournir une indication sur le comportement global de liant. La deuxieme partie de l'etude se concentre sur certains des defis lorsqu'on utilise le test MSCR, y compris la variabilite des resultats des essais, entre les dispositifs d'essais et entre les laboratoires. Dans cette partie, on utilise les donnees recueillies recemment de plus de 50 laboratoires par le Western Cooperative Testing Group (WCTG) du groupement Rocky Mountain de producteur-utilisateur de bitume. L'etude conclut avec la recommandation particuliere concernant l'utilisation des resultats du MSCR et leur relation avec la performance des enrobes bitumineux.

Language

  • English

Media Info

  • Pagination: 203-222
  • Monograph Title: Proceedings of the Fifty-Sixth Annual Conference of the Canadian Technical Asphalt Association (CTAA) - Quebec City, Quebec

Subject/Index Terms

Filing Info

  • Accession Number: 01368669
  • Record Type: Publication
  • Source Agency: Transportation Association of Canada (TAC)
  • ISBN: 9780986914102
  • Files: ITRD
  • Created Date: Apr 26 2012 1:45PM