Abstract
Replacing traditional construction materials with industrial by-products can reduce their disposal in landfills, offering a sustainable geo-environmental solution. This study evaluates the feasibility of using various mixtures of EAF steel slag and other industrial by-products for their use as a suitable geo-material that can replace lime in subgrade stabilization applications. Field-test results and experiences gained in the implementation of the selected mixture in the field are presented. In the present study, clayey subgrade soils obtained from a potential stabilization site were blended with EAF steel slag (EAFSS)-Class C fly ash (CFA) and EAFSS-blast furnace slag (BFS) mixtures and tested in the laboratory. Proctor compaction curves and Atterberg Limits (ALs) of the mixtures were determined in the laboratory. The strength of the stabilized soil mixtures was determined through unconfined compression (UC) tests. Based on the results of the laboratory tests, the 7%EAFSS-3%CFA mixture was selected as the most suitable for lime replacement. The selected mixture was utilized in the field for a trial section of a pavement project. The dynamic cone penetrometer tests (DCPTs) performed 96 h after the subgrade compaction indicated the strength gain associated with the cementitious reactions and the effectiveness of the mixture in the stabilization of the clayey soil. The subgrade stabilized with EAFSS has been performing satisfactorily, discontinuities or visible signs of stress failure are not observed in the pavement sections constructed using the EAFSS-CFA mixture.
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Acknowledgements
The authors are grateful for the financial support (FHWA/IN/ JTRP-2013/SPR-3477), provided by the Indiana Department of Transportation (INDOT) and Edward C. Levy Co. (Levy) for the project. We convey our thanks to John Yzenas, Nayyar Zia Siddiki and Hobi Kim for their contributions to this study. The authors also appreciate the financial support provided by Bogazici University with BAP project number 16961.
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Yildirim, I.Z., Prezzi, M. (2023). Field Implementation of EAF Steel Slag Mixtures in Clayey Subgrade Stabilization. In: Yukselen-Aksoy, Y., Reddy, K.R., Agnihotri, A.K. (eds) Sustainable Earth and Beyond. EGRWSE 2022. Lecture Notes in Civil Engineering, vol 370. Springer, Singapore. https://doi.org/10.1007/978-981-99-4041-7_32
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