Evalua on of LD slag expansion effects on the mechanical behavior of asphalt mixtures subject to aging and moisture damage

Recebido: 8 de dezembro de 2020 Aceito para publicação: 27 de janeiro de 2021 Publicado: 30 de agosto de 2021 Editor de área: Kamilla Vasconcelos ABSTRACT Steel slag aggregates, such as Linz-Donawitz slag (LD), undergo volumetric expansions when subjected to heat and humidity. However, the asphalt binder might stabilize the LD expansion in hot mixture asphalt (HMA). This work aims to evaluate LD expansion effects on the mechanical behavior of HMA subject to aging and moisture damage. Four dense HMA were evaluated, one reference and three mixtures with 25% LD with different ini>al expansion. The mixtures were subjected to shortand longterm aging. Subsequently, compacted specimens were subjected to moisture induced damage and indirect tensile strength tests. Also, the expansion of aggregates extracted from HMA were evaluated. Mixtures with LD presented sa>sfactory mechanical results and even superior than mixtures produced without LD. It was also observed no significant difference in the expansion values between the aggregates extracted from the mixtures aAer condi>oning indica>ng that LD expansion effects might have been stabilized.