Document Type : Original Article
Authors
1
Department of civil Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran
2
PhD Student, Department of Civil Engineering, Ayatollah Amoli Branch, Islamic Azad University, Amol, Iran,
3
postgraduate
10.22034/tri.2023.389570.3138
Abstract
Pavements are the national capital of countries that annually attract a bulk of the relevant organizations budgets for their designing, constructing, repairing and maintaining. The Rutting is one of the structural failures that is seen in the groove in the direction of the vehicle's wheel. The development of ruts causes cracks, especially alligator cracks, and ultimately leads to the general rupture of the pavement. The bitumen used in asphalt mixtures must have sufficient hardness to deal with the phenomenon of rutting, and on the other hand, the necessary flexibility to avoid thermal cracks at low temperatures. Considering that normal bitumens are not able to provide such properties, it is necessary to use modifiers to improve the functional properties of bitumens. Among the materials that can be used and tested as a filler in bitumen is coal waste ash, which can be seen in large quantities around coal mines. The main goal of the current research was to investigate the rutting resistance of bitumen containing coal waste ash using a dynamic shear rheometer. In this research, bitumen 60-70 was used in pure form and also contained 3% and 6% coal waste ash, and the resistance of the mixture against rutting failure was measured using a dynamic shear rheometer at temperatures of (52°C, 58°C, 64°C and 70°C), and at frequencies of 2.23 to 100 Hz were examined and tested. The results showed that the use of coal waste ash at the rate of 3 and 6% significantly increased the resistance of bitumen against rutting damage at high temperatures compared to pure bitumen. In this way, with the optimal use of this material in the asphalt mixture, in addition to reducing the depth of rutting, the accumulation of these waste materials in the environment was prevented.
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