Technical Papers
Dec 19, 2022

The Impact of Nano-TiO2 Particles on the Moisture Susceptibility and Fracture Toughness of HMA under Mixed-Mode I/II Loading and Various Crack Geometry and Temperatures

Publication: Journal of Materials in Civil Engineering
Volume 35, Issue 3

Abstract

In recent decades, some of the main goals of pavement engineers have been to increase bearing capacity, enhance tensile strength, and improve the moisture susceptibility of asphalt mixtures. Because moisture and frost intensify the damage caused by traffic loads on pavements in cold climates, the life and safety of asphalt pavements in this climate are reduced. Finally, cracking at low temperatures and moisture damage leads to a decrease in the serviceability of asphalt pavement in cold climates relative to temperate climates. Hence, a comprehensive and accurate program is necessary to estimate the fracture toughness and moisture susceptibility of asphalt mixtures in cold climates. In recent years, nanotechnology has become very popular due to its unique features in enhancing the operation of bitumen and asphalt mixtures. For this purpose, in this study, the impact of nano-TiO2 on pavement performance against cracking and moisture susceptibility is investigated. To achieve this objective, SCB specimens were fabricated with different ratios of nano-TiO2 (0.0% and 0.9%) and studied at the three temperatures of 5°C, 15°C, and 25°C under pure mode I, pure mode II, and four distinct mixed-mode (I/II) loading (Me=0.2, Me=0.4, Me=0.6, Me=0.8) for various crack geometry, including vertical and angular cracks for which the crack angle is 45° in samples with angular cracks. In addition, the indirect tensile strength (ITS) test was employed to estimate the moisture susceptibility. The results indicated that modifying the asphalt mixture properties with 0.9% nano-TiO2 had a significant impact on the fracture behavior of the samples in both vertical and angular cracks under all temperatures. Additionally, with the application of nano-TiO2 and decreasing temperature, the fracture toughness of the samples increased. Furthermore, the findings displayed that the employment of 0.9% nano-TiO2 reduced the moisture susceptibility of asphalt mixtures by approximately 6%.

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Data Availability Statement

All data, models, and code generated or used during the study appear in the published paper.

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Published In

Go to Journal of Materials in Civil Engineering
Journal of Materials in Civil Engineering
Volume 35Issue 3March 2023

History

Received: Dec 19, 2021
Accepted: Jun 2, 2022
Published online: Dec 19, 2022
Published in print: Mar 1, 2023
Discussion open until: May 19, 2023

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Authors

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Amir Mohammad Hamedipour [email protected]
Graduate Student, School of Civil Engineering, Semnan Univ., P.O. Box 3519693117, Semnan, IR Iran. Email: [email protected]
Gholamali Shafabakhsh [email protected]
Professor, School of Civil Engineering, Semnan Univ., P.O. Box 3513119111, Semnan, IR Iran (corresponding author). Email: [email protected]
Mostafa Sadeghnejad [email protected]
Assistant Professor, Department of Civil Engineering, Faculty of Technology and Engineering (Eastern Guilan), Univ. of Guilan, P.O. Box 4199613776, Rasht, Iran. Email: [email protected]

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  • Experimental and Statistical Investigation of the Effect of Nano on Asphalt Mixture Resistance against Low Temperature Cracking and Moisture Susceptibility, Journal of Materials in Civil Engineering, 10.1061/JMCEE7.MTENG-18054, 36, 9, (2024).

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