1. An experimental length scale investigation on viscoelastic behavior of bituminous composites: Focusing on mortar scale
- Author
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Mojtaba Khodadadi, Joseph Absi, Ali Khodaii, Pouria Hajikarimi, Fateh Fakhari Tehrani, Amirkabir University of Technology (AUT), IRCER - Axe 2 : procédés plasmas et lasers (IRCER-AXE2), Institut de Recherche sur les CERamiques (IRCER), Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS)-Institut des Procédés Appliqués aux Matériaux (IPAM), Université de Limoges (UNILIM)-Université de Limoges (UNILIM)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), and Conservatoire National des Arts et Métiers [CNAM] (CNAM)
- Subjects
Length scale ,0303 health sciences ,Materials science ,Aggregate (composite) ,Grading on a curve ,Building and Construction ,[CHIM.MATE]Chemical Sciences/Material chemistry ,Viscoelasticity ,[SPI.MAT]Engineering Sciences [physics]/Materials ,03 medical and health sciences ,0302 clinical medicine ,Asphalt ,030220 oncology & carcinogenesis ,Dynamic modulus ,General Materials Science ,Mortar ,Composite material ,Scaling ,ComputingMilieux_MISCELLANEOUS ,030304 developmental biology ,Civil and Structural Engineering - Abstract
The mortar component plays an essential role in forming different asphalt mixture distresses. The fine aggregate size affects the viscoelastic behavior of mortar. In this study, three cutting sizes of 3.35, 2.36, and 1.7 mm, on the aggregate grading curve were considered to construct the mortar scales, namely mortar (I), (II), and (III), respectively. With a unique loading mode, a frequency sweep test was performed on four different length scales, including bitumen, asphalt mastic, mortar, and asphalt mixture, to make a direct comparison through a multi-scale approach. Also, a stress sweep test was conducted to find the mortar scale's linear viscoelastic domain. The results indicate that different mortar types have variable linear viscoelastic domains. The master curves of dynamic modulus (E*) and phase angle (δ) show that adding filler to bitumen has more effect on the E* than the δ. Although scaling up from the mastic to mortar (II) causes a significant difference between the viscoelastic parameters, the results remained approximately the same. The main gap between the mixture and mentioned sub-scales is filled with mortar (I). While the Cole-Cole diagrams demonstrate that the bitumen to mortar (II) scales have the same behavior, the closest scale to the mixture is the mortar (I). Therefore, using a cutting size of 3.35 mm is recommended to fabricate mortar (for asphalt mixture with a nominal maximum aggregate size of 19 mm) instead of 2.36 mm, which was suggested in previous studies.
- Published
- 2021
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