Moisture characteristics of warm mix asphalt containing reclaimed asphalt pavement (RAP) or steel slag

• Published in: Materials and structures Vol. 55; no. 2
• Main Authors: Goli, Hadi, Latifi, Manouchehr, Sadeghian, Mohammad
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer Netherlands 01.03.2022; Springer Nature B.V
• Subjects: Aggregates; Asphalt mixes; Asphalt pavements; Bend strength; Bending fatigue; Building construction; Building Materials; Civil Engineering; Creep tests; Damage; Engineering; Fatigue failure; Fatigue tests; Machines; Manufacturing; Materials Science; Moisture; Natural resources; Original Article; Processes; Slag; Solid Mechanics; Steel; Tensile strength; Theoretical and Applied Mechanics; Asphalt mixture; Moisture damage; Warm mix asphalt; Reclaimed asphalt pavement; Steel slag
• ISSN: 1359-5997; 1871-6873
• DOI: 10.1617/s11527-022-01893-0

Issues like limitation of natural resources of aggregates, global warming, need for eco-friendly, cost-effective, and high performance and durable asphalt mixture, have made the Reclaimed Asphalt Pavements Warm Mix Asphalt (RAP-WMA) and Steel Slag Warm Mix Asphalt (SS-WMA) interesting substitutions for conventional Hot Mix Asphalt mixtures. Furthermore, presence of moisture initiates and accelerates the deterioration of both of these mixtures. In this way, the response of the RAP-WMA to the moisture damage was compared with the SS-WMA using experimental tests including Indirect Tensile fatigue failure, Resilient Modulus, Indirect Tensile Strength, Semi-circular Bending, and Dynamic Creep tests. The obtained results show that although the RAP-WMA and SS-WMA mixtures contain hydrophilic and moisture sensitive aggregates and aged binder, they had an appropriate performance against the effect of moisture. Also, the SS-WMA mixtures showed better performance against moisture than the RAP-WMA mixtures, and therefore, they can be recommended as a substitution for RAP-WMA in regions where moisture damage is prevailing.