Effect of Natural Bitumen on the Performance of Hot Asphalt Mixture‏

Year 2024, , 1154 - 1170, 01.09.2024

Fatima Ahmed , Roaa Latief , Amjad Albayati

https://doi.org/10.35378/gujs.1282239

Cited By: 1

Abstract

For over a century, the global consumption of asphalt binder in asphalt mixture production has been substantial. In the Heet region (west of Iraq), two distinct forms of natural asphalt (NA) deposits exist: rock asphalt and sulfur spring asphalt. This study focused on using NA sourced from sulfur springs. The aim was to investigate the potential of incorporating NA into local asphalt mixtures. To achieve this, NA was heated to 163°C for varying durations. After heat treatment, laboratory tests were conducted on NA. The findings suggest that by heating NA for 20 hours, it conforms to Iraqi specifications in terms of physical properties. Furthermore, compared to conventional petroleum asphalt, treated NA showed greater resistance to temperature fluctuations, making it ideal for hotter climates. The study also found that NA enhances mechanical properties significantly. Specifically, the NA mixture recorded the highest indirect tensile strength, with a tensile strength ratio of 81.2%, a slight increase of 0.37% over traditional mixes. In summary, NA mixtures exhibit commendable performance. Given its abundance and affordability in Iraq, after considering heat treatment costs and environmental impact, NA holds promise for the future of asphalt concrete production for the construction of flexible pavement.

Keywords

Natural asphalt, Heating treatment, Mechanical properties, Susceptibility, Sulfur spring

Supporting Institution

Baghdad University

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