Resumo

BASTIDAS MARTINEZ, Juan Gabriel; SANCHEZ LOSADA, Javier Mauricio  e  RONDON QUINTANA, Hugo Alexander. Evaluation of an asphalt mixture with the incorporation of recycled concrete aggregates superficially treated with a chemical solution of magnesium sulfate. Cienc. Ing. Neogranad. [online]. 2022, vol.32, n.1, pp.9-23.  Epub 03-Jun-2022. ISSN 0124-8170.  https://doi.org/10.18359/rcin.4733.

This article analyzed in the laboratory the use of Recycled Concrete Aggregates (RCA) when they are incorporated as coarse aggregates in a hot dense asphalt mixture MDC-19. The main problem of the use of RCA in MDCs is its high absorption caused by the mortar that covers the particles, which causes an increase in the optimum asphalt content and, consequently, high production costs. In order to solve this problem, chemical treatments were carried out on the surface of the RCA aggregate using 1, 3 and 5 cycles of immersion in a magnesium sulfate solution, according to the aggregate durability test specified by AASHTO T 104-99. On the mixtures that incorporated RCA (with and without chemical treatment), resistance tests were carried out under monotonic load (Marshall and indirect tensile strength) and wear resistance to Cantabrian abrasion. The results show that the use of chemically treated RCA in the manufacture of asphalt mixtures increases the resistance under monotonic load (Marshall test and indirect tensile strength in dry conditions), providing greater cohesion and a slight increase in adherence with reference to the control mix. Additionally, it was evidenced that the RCA aggregate subjected to 5 cycles provides similar resistance in the asphalt mixture to indirect traction under wet conditions and Cantabrian wear than the control sample.

Palavras-chave : Recycled Concrete Aggregates (RCA); hot dense asphalt mix; chemical treatment.

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