Effect of carbonation of soil-slag mixtures on the resilient behaviour and structural response of an asphalt pavement

• Published in: Road materials and pavement design Vol. 25; no. 10; pp. 2101 - 2120
• Main Authors: Rodrigues, Klaus Henrique de Paula, Silva, Taciano Oliveira da, Pitanga, Heraldo Nunes, Almeida, Mario Sergio de Souza, Pedroti, Leonardo Gonçalves, Rodrigues, Mateus Henrique Ribeiro, Lopes, Emerson Cordeiro
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 02.10.2024; Lavoisier
• Subjects: accelerated carbonation; AEMC; Asphalt pavements; Calcium carbonate; Carbonation; Deflection; durability of stabilised soils; electric arc furnace slag (EAFS); Electric arc furnaces; Population growth; Slag; Soil analysis; Soil layers; Soil mixtures; Strain analysis; Structural analysis; Structural response; Tensile strain
• ISSN: 1468-0629; 2164-7402
• DOI: 10.1080/14680629.2023.2300364

In the face of rapid population growth and industrialisation, mitigating the harmful effects of CO 2 emissions becomes an important issue to be studied. The objective of this study was to perform a structural analysis evaluating the influence of carbonation of soil-electric arc furnace slag (EAFS) mixtures used in the subgrade layer of an asphalt pavement. Resilient modulus tests (RM) were performed on the soil-EAFS mixtures subjected to two curing processes. The structural analysis was performed using the AEMC software, being evaluated: (i) the deflection at the top of the asphalt layer, (ii) the horizontal tensile strain at the bottom of the same layer, and (iii) the vertical strain at the top of the subgrade layer. Carbonation increased the values of RM due to the formation of calcium carbonate, which led to a reduction in the analysed deflection and strains, resulting in a more durable asphalt pavement.