Journal Published Online: 15 July 2019
Volume 48, Issue 1

Complex Modulus Testing and Rheological Modeling of Cold-Recycled Mixtures

CODEN: JTEVAB

Abstract

This research compares the rheological behavior of different cold-recycled mixtures (CRMs) produced in-place through full-depth reclamation. Reclaimed asphalt pavement (RAP) obtained from the milling of the old asphalt layers was blended with reclaimed unbound aggregate from the existing subgrade. Asphalt emulsion, foamed asphalt, and portland cement were employed as stabilizing agents. The complex modulus was measured on cylindrical cores, applying a sinusoidal strain with an amplitude of 30 microstrain at testing temperatures ranging from 0°C to 50°C and frequencies ranging from 0.1 to 20 Hz. The Huet-Sayegh (HS) rheological model was applied to simulate the experimental data. The results showed that the behavior of CRM is thermo- and frequency-dependent and that the time-temperature superposition principle can be applied. The HS model provides an excellent fitting of the dynamic modulus data, whereas fitting of the loss angle data was improved, introducing a temperature- and frequency-independent correction. The RAP influences the rheological behavior, but viscous dissipation is mainly due to the asphalt-stabilizing agents (emulsion residue or foamed asphalt).

Author Information

Graziani, Andrea
Department of Civil and Building Engineering and Architecture, Università Politecnica delle Marche, Ancona, Italy
Mignini, Chiara
Department of Civil and Building Engineering and Architecture, Università Politecnica delle Marche, Ancona, Italy
Bocci, Edoardo
Department of Engineering, Università degli Sudi eCampus, Novedrate, Italy
Bocci, Maurizio
Department of Civil and Building Engineering and Architecture, Università Politecnica delle Marche, Ancona, Italy
Pages: 14
Price: $25.00
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Stock #: JTE20180905
ISSN: 0090-3973
DOI: 10.1520/JTE20180905