Investigation Mode I and Mode II of Fracture Toughness of Asphalt Concrete Containing Steel Slag Powder at Low Temperature

Articles in Press

Document Type : Research Paper

Authors

1 Payame-Noor university

2 department of civil engineering, Payam-e-noor university, Tehran, Iran

Abstract

Various waste and recycled materials are used in concrete mixtures to produce green building materials, and among them, steel slag is a favorite material that can be used as a partial replacement for natural stone aggregates. In this study, the effect of adding steel slag powder as a filler on the Mode I and Mode II fracture toughness of hot mix asphalt (HMA) was investigated. A semicircular bending specimen with a vertical edge crack was used for the tests. Different HMA mixtures containing 0, 3, and 5 wt.% steel slag filler were prepared using the gyratory compaction method with a void ratio of 3%. Mode I and Mode II fracture toughness tests were performed using symmetric and asymmetric half-disk loading at two low temperatures of -12 and -24 °C. According to the results, by adding steel slag powder and increasing its percentage for both temperatures, the values of KIc and KIIc increase, but the values of KIc and KIIc increase more and more significantly with decreasing temperature. For each mixture and temperature, the fracture toughness of Mode II was lower than KIc so that KIIc / KIc fluctuates in a small range from 0.8 to 0.87. These results show good agreement with the predictions of each of the conventional fracture criteria of basic stress and basic energy.

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Main Subjects

Journal of Transportation Infrastructure Engineering

Articles in Press, Accepted Manuscript
Available Online from 06 April 2025

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History

  • Receive Date: 08 February 2025
  • Revise Date: 31 March 2025
  • Accept Date: 06 April 2025

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