Use of fine aggregate matrix to analyze the rheological behavior of cold recycled materials
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ORIGINAL ARTICLE
Use of fine aggregate matrix to analyze the rheological behavior of cold recycled materials Andrea Graziani Daniel Perraton
. Simone Raschia . Chiara Mignini
. Alan Carter
.
Received: 27 March 2020 / Accepted: 16 June 2020 RILEM 2020
Abstract Nowadays, one of the main challenges to a wider application of cold recycling techniques is the lack of reliable information on the mechanical behavior of cold recycled materials (CRM). In this context, measurement and modelling of the complex modulus of CRM mixtures may give an important contribution to the design and analysis of pavements including cold recycled layers. In this study, we analyzed the rheological behavior of CRM mixtures produced using bitumen emulsion and cement through the study of their fine aggregate matrix (FAM). Starting from a fixed CRM mixture composition, we compared different FAM mortars, focusing on the effect of water and air content. Then, we selected a composition as representative of the FAM in the mixture and investigated the evolution of both materials during a fixed curing period. Next, we measured the complex modulus of the CRM mixture and FAM at two curing stages and applied a rheological model to simulate and compare their behavior. Results showed that the properties of CRM mixtures are comparable to those
A. Graziani (&) C. Mignini Department ICEA of Civil and Building Engineering, and Architecture, Polytechnic University of Marche, Via Brecce Bianche, 60131 Ancona, Italy e-mail: [email protected] S. Raschia A. Carter D. Perraton Construction Engineering Department, E´cole de Technologie Supe´rieure (E´TS), 1100, Notre-Dame Street West, Montre´al, Canada
of FAM mortars produced using all the binding agents (bitumen emulsion and cement) and a fraction of the voids contained in the mixture. Despite the huge difference in volumetric compositions, the FAM mortar controlled the curing and the thermo-rheological behavior of the CRM mixture, while the coarse reclaimed asphalt aggregate fraction and the voids mainly affected the asymptotic properties (equilibrium and glassy moduli) and the non-viscous dissipation component. Keywords Cold recycled materials Fine aggregate matrix Mortar Curing Complex modulus Thermorheological modeling
1 Introduction Cold recycling of bituminous pavements has gained the interest of an increasing number of road agencies and contractors worldwide. On the one hand, this is due to the increasing emphasis that is placed on sustainability and reuse of end-of-life products like reclaimed asphalt (RA) [1–3]. On the other hand, field applications are showing that cold recycled materials (CRM) are an economically and structurally viable solution even for high traffic roadways [4–7]. In order to promote a wider application of CRM mixtures, a deeper knowledge of their mechanical behavior is critical. First, it must be recognized that
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CRM were developed and are applied following different composition concepts, lead
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