Print Email Facebook Twitter The effect of ageing on chemical and mechanical properties of asphalt mortar Title The effect of ageing on chemical and mechanical properties of asphalt mortar Author Jing, R. (TU Delft Pavement Engineering) Liu, X. (TU Delft Pavement Engineering) Varveri, Aikaterini (TU Delft Pavement Engineering) Scarpas, Athanasios (TU Delft Pavement Engineering; Khalifa University of Science and Technology) Erkens, S. (TU Delft Pavement Engineering) Date 2018 Abstract Asphalt mortar is a mixture of bitumen, filler, and sand. Mortar plays an important role in asphalt mixtures as it serves as the adhesive between the coarser aggregates. Due to the effect of bitumen ageing, the chemical and mechanical properties of asphalt mortar evolve with time. The mortar becomes more brittle and prone to cracking, thus leading to inferior pavement performance. In this study, Fourier transform infrared (FTIR) spectrometry was used to quantify changes in the chemical functional groups related to ageing and to calculate the carbonyl and sulfoxide indices. In addition, frequency sweep tests and uniaxial tension tests were performed by means of dynamic shear rheometer (DSR) tests to determine evolution of the stiffness and strength due to ageing. Two different oven ageing protocols were used to evaluate the effect of fine mineral particles on bitumen ageing. The protocols differed with respect to the order of ageing and mixing of the constituents. The results showed that both the chemical and mechanical properties of mortars significantly changed with ageing. Specifically, the carbonyl index, stiffness, and strength of the mortar increased. Under the same ageing conditions, a higher ageing level was observed for mortars produced by first mixing and then ageing compared to the mortars produced by mixing aged bitumen with filler and sand. This could be due to the presence of sand and filler particles, which resulted in an increased length of diffusion paths and consequently a slower ageing process. Subject AgeingAsphalt mortarFTIRStiffnessStrength To reference this document use: http://resolver.tudelft.nl/uuid:545c05a9-8e95-43af-b2eb-9d1b08c35755 DOI https://doi.org/10.3390/app8112231 Source Applied Sciences, 8 (11) Part of collection Institutional Repository Document type journal article Rights © 2018 R. Jing, X. Liu, Aikaterini Varveri, Athanasios Scarpas, S. Erkens Files PDF applsci_08_02231.pdf 1.16 MB Close viewer /islandora/object/uuid:545c05a9-8e95-43af-b2eb-9d1b08c35755/datastream/OBJ/view