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Article

Modeling and Laboratory Investigation of Tack Coats as Bituminous Pavement Interlayer

by
Alessandro Steffanoni
1,
Michel Di Tommaso
2,
Vito Giovanni Gallo
2,
Giuseppe Macaluso
2,
Carmine Rizzato
2,
Misagh Ketabdari
1 and
Emanuele Toraldo
1,*
1
Department of Civil and Environmental Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milan, Italy
2
IMM SA—Istituto Meccanica dei Materiali SA, Via al Molino 55, CH 6926 Montagnola, Switzerland
*
Author to whom correspondence should be addressed.
Buildings 2024, 14(8), 2358; https://doi.org/10.3390/buildings14082358
Submission received: 24 June 2024 / Revised: 24 July 2024 / Accepted: 29 July 2024 / Published: 31 July 2024
(This article belongs to the Special Issue Advances in Road Pavements)
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Abstract

The adhesive properties of tack coats between asphalt pavement layers are crucial for the pavement’s structural behavior. This study first involved numerical analyses to compare stress patterns, deformations, and displacements in the pavement structure under various geometric and mechanical conditions. A rational calculation method based on the theory of elastic multilayer systems was used to quantify the impact of layer properties such as thickness, stiffness modulus, and Poisson’s ratio on interlayer bonding. Three bonding conditions—Full Friction, Partial Bonding, and Full Debonding—were analyzed to understand the tack coat’s effect between the top two layers. The second phase involved characterizing the mechanical behavior of the interface through shear strength tests (Leutner shear test) on both laboratory-prepared specimens and samples from a 10-year-old highway. Specimens were prepared using a Roller Compactor and tested under different interface conditions: hot-on-hot (H/H), residual bitumen 200 g/m2 (RB 200), and residual bitumen 400 g/m2 (RB 400). The tests examined the bonding effects in terms of tangential force and shear displacement at failure, as well as the impact of vehicular traffic on rutting and fatigue failure. Finally, this study investigated the long-term aging effects of the binder on interlayer bonding and sought to correlate the results of numerical calculations with those of the laboratory tests.
Keywords: tack coat; bonding effect; bituminous interlayers; Leutner shear test; pavement layers tack coat; bonding effect; bituminous interlayers; Leutner shear test; pavement layers

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MDPI and ACS Style

Steffanoni, A.; Di Tommaso, M.; Gallo, V.G.; Macaluso, G.; Rizzato, C.; Ketabdari, M.; Toraldo, E. Modeling and Laboratory Investigation of Tack Coats as Bituminous Pavement Interlayer. Buildings 2024, 14, 2358. https://doi.org/10.3390/buildings14082358

AMA Style

Steffanoni A, Di Tommaso M, Gallo VG, Macaluso G, Rizzato C, Ketabdari M, Toraldo E. Modeling and Laboratory Investigation of Tack Coats as Bituminous Pavement Interlayer. Buildings. 2024; 14(8):2358. https://doi.org/10.3390/buildings14082358

Chicago/Turabian Style

Steffanoni, Alessandro, Michel Di Tommaso, Vito Giovanni Gallo, Giuseppe Macaluso, Carmine Rizzato, Misagh Ketabdari, and Emanuele Toraldo. 2024. "Modeling and Laboratory Investigation of Tack Coats as Bituminous Pavement Interlayer" Buildings 14, no. 8: 2358. https://doi.org/10.3390/buildings14082358

APA Style

Steffanoni, A., Di Tommaso, M., Gallo, V. G., Macaluso, G., Rizzato, C., Ketabdari, M., & Toraldo, E. (2024). Modeling and Laboratory Investigation of Tack Coats as Bituminous Pavement Interlayer. Buildings, 14(8), 2358. https://doi.org/10.3390/buildings14082358

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