Study of Clayey Soils Stabilized with Ladle Furnace Slag as Alternative Binder for Use in Road Works

Abstract:

Steelmaking industry generates a large volume of by-products that not always can be reintroduced into production processes, such as the steelmaking process itself or the production of cement. This is the case of ladle furnace slag (LFS), whose potential use is limited and usually ends up in landfill. This work investigates the feasibility of using LFS as binder for clayey soils stabilization in substitution of lime. The main parameters evaluated are plasticity index, California Bearing Ratio (CBR) and Unconfined Compressive Strength (UCS). The results show that the strength behavior of the mixtures is remarkable, obtaining increases in the CBR index between 8-14 times above unmodified clays. The mechanical performance base on UCS results show improvements of 85 % relative to natural soils three days after mixing. Moreover, if the curing time is up to 90 days, the UCS doubles or triples its value. Depending on the chemical composition of the soils, the performances of the mixtures are different, but in all cases the results are positive and encourage further research for the incorporation of ladle furnace slag as stabilizing agent.

• Periodical: Key Engineering Materials (Volume 929)
• Pages: 187-192
• DOI: https://doi.org/10.4028/p-9mj872
• Online since: August 2022
• Authors: Ana B. Espinosa*, Víctor Revilla-Cuesta, Víctor López-Ausín, Roberto Serrano-López, Francisco Fiol
• Keywords: CBR, Clayey Soil, Ladle Furnace Slag, Lime, Soil Stabilization, Unconfined Compressive Strength

References

[1] Maghool, F., et al., Environmental impacts of utilizing waste steel slag aggregates as recycled road construction materials. Clean Technologies and Environmental Policy, 2017. 19(4): pp.949-958.

DOI: 10.1007/s10098-016-1289-6

[2] Serjun, V.Z., B. Mirtič, and A. Mladenovič, Evaluation of ladle slag as a potential material for building and civil engineering. Materiali in Tehnologije, 2013. 47(5): pp.543-550.

[3] Pasetto, M., et al., Performance-Based characterization of bituminous mortars prepared with ladle furnace steel slag. Sustainability (Switzerland), 2020. 12(5).

DOI: 10.3390/su12051777

[4] Seco, A., et al., Sulphate soil stabilisation with magnesium binders for road subgrade construction. International Journal of Pavement Engineering, 2020: pp.1-11.

DOI: 10.1080/10298436.2020.1825711

[5] Santamaría, A., et al., The design of self-compacting structural mortar containing steelmaking slags as aggregate. Cement and Concrete Composites, 2020. 111.

DOI: 10.1016/j.cemconcomp.2020.103627

[6] Mahoutian, M. and Y. Shao, Low temperature synthesis of cement from ladle slag and fly ash. Journal of Sustainable Cement-Based Materials, 2016. 5(4): pp.247-258.

DOI: 10.1080/21650373.2015.1047913

[7] Behnood, A., Soil and clay stabilization with calcium- and non-calcium-based additives: A state-of-the-art review of challenges, approaches and techniques. Transportation Geotechnics, 2018. 17: pp.14-32.

DOI: 10.1016/j.trgeo.2018.08.002

[8] Xu, B. and Y. Yi, Soft clay stabilization using ladle slag-ground granulated blastfurnace slag blend. Applied Clay Science, 2019. 178.

DOI: 10.1016/j.clay.2019.105136

[9] SPAIN, Artículo 512 :Suelos estabilizados in situ Ministerio de Fomento Orden FOM/2523/2014, (2014).

[10] AENOR, UNE-EN ISO 17892-12. Geotechnical Investigation and Testing-Laboratory Testing of Soil-Part 12: Determination of Liquid and Plastic Limits. ISO: Ginebra, Suiza, (2019).

DOI: 10.3403/30340673u

[11] Bell, F.G., Lime stabilization of clay minerals and soils. Engineering Geology, 1996. 42(4): pp.223-237.

DOI: 10.1016/0013-7952(96)00028-2

[12] Boardman, D.I., S. Glendinning, and C.D.F. Rogers, Development of stabilisation and solidification in lime-clay mixes. Geotechnique, 2001. 51(6): pp.533-543.

DOI: 10.1680/geot.2001.51.6.533

[13] Ortega-López, V., et al., The long-term accelerated expansion of various ladle-furnace basic slags and their soil-stabilization applications. Construction and Building Materials, 2014. 68: pp.455-464.

DOI: 10.1016/j.conbuildmat.2014.07.023

[14] Skaf, M., et al., Ladle furnace slag in asphalt mixes. Construction and Building Materials, 2016. 122: pp.488-495.

DOI: 10.1016/j.conbuildmat.2016.06.085

[15] Manso, J.M., et al., The use of ladle furnace slag in soil stabilization. Construction and Building Materials, 2013. 40: pp.126-134.

DOI: 10.1016/j.conbuildmat.2012.09.079

[16] Rahmat, M.N. and J.M. Kinuthia, Compaction of fills involving stabilisation of expansive soils. Proceedings of the Institution of Civil Engineers: Geotechnical Engineering, 2011. 164(2): pp.113-126.

DOI: 10.1680/geng.2011.164.2.113

[17] Montenegro, J.M., et al., Ladle furnace slag in the construction of embankments: Expansive behavior. Journal of Materials in Civil Engineering, 2013. 25(8): pp.972-979.

DOI: 10.1061/(asce)mt.1943-5533.0000642

[18] AENOR, UNE 103502. Test Laboratory Method for Determining in a Soil the C.B.R. Index. UNE: Madrid, España, (1995).

[19] SPAIN, Capitulo III: Explanaciones. Ministerio de Fomento FOM 1382/2002 Spain, (2002).

[20] SPAIN, Instrucción de carreteras. Norma 6.1 IC: Secciones de firme. Ministerio de Fomento. Norm. Instr. Construcción, 2003: p.41.

[21] AENOR, UNE-EN ISO 17892-7. Geotechnical Investigation and Testing-Laboratory Testing of Soil-Part 7: Unconfined Compression Test. ISO: Ginebra, Suiza, (2019).

DOI: 10.3403/30340681u

[22] AENOR, UNE 103 100. Sample preparation for soil test. UNE: Madrid, España, (1995).