2024, Volume 70(74), Issue 2 (June), pp. 53 - 63

Partial Replacement of Natural Aggregates by Incorporating Steel Slag for The Manufacture of Asphalt Mixture

BOGDAN VALENTIN PĂUNESCU, Consitrans SA Bucharest, Romania
ENIKÖ VOLCEANOV, National University of Science and Technology POLITEHNICA Bucharest, Faculty of Engineering in Foreign Language, Bucharest, Romania, Metallurgical Research Institute SA Bucharest, Romania
LUCIAN PĂUNESCU, Daily Sourcing & Research SRL Bucharest, Romania, lucianpaunescu16@gmail.com

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DOI: 10.5281/zenodo.13308225

Abstract
Creating high-durable asphalt mixtures by implementing steel slag in the mix aggregate as a partial substitute constituted the main objective of the work. The addition of slag is beneficial for increasing the asphalt strength, but simultaneously, high content of this by-product tends to reduce the Marshall stability. The experiment tested asphalt mixture making up to 76% slag content, but the best results were obtained for the specimen with 57% slag, i.e. compression strength after 24 hours of 4.8 MPa and after 28 days of 3.6 MPa. In addition, less expensive materials (4-8 mm-slag granulometric class and electro filter dust) were adopted, without negatively influencing the usual product characteristics.
Keywords: asphalt mixture, bitumen, natural aggregate, steel slag, filler