Chemical, mineralogical, microstructural and engineering properties of tropical soils stabilised with the combined and individual use of different types of steel slag

The combined use of electric arc furnace slag fines (EAFSF) and ladle furnace slag fines (LFSF) for soil stabilisation was not evaluated in previous works. Previous studies reported limited information on the microscale behaviour of steel slag materials used in soil stabilisation. This work evaluate...

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Published inRoad materials and pavement design Vol. 25; no. 7; pp. 1507 - 1527
Main Authors Lopes, Emerson Cordeiro, da Silva, Taciano Oliveira, Pitanga, Heraldo Nunes, Pedroti, Leonardo Gonçalves, de Carvalho, José Maria Franco, Nalon, Gustavo Henrique, de Araújo, Eduardo Nery Duarte, de Paula Rodrigues, Klaus Henrique
Format Journal Article
LanguageEnglish
Published Abingdon Taylor & Francis 02.07.2024
Lavoisier
Subjects
Compressive strength
electric arc furnace slag
Electric arc furnaces
Fines
Ion exchange
ladle furnace slag
microstructural investigation
Raman spectroscopy
Raw materials
Road construction
Sandy soils
Slag
Soil properties
soil stabilisation
Soil stabilization
Steel
Synergistic effect
Thermogravimetric analysis
Thermogravimetry
Tropical soils
X-ray fluorescence
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Summary:The combined use of electric arc furnace slag fines (EAFSF) and ladle furnace slag fines (LFSF) for soil stabilisation was not evaluated in previous works. Previous studies reported limited information on the microscale behaviour of steel slag materials used in soil stabilisation. This work evaluated synergistic effects provided by the combination of EAFSF and LFSF on the stabilisation of clayey and sandy soils. It provided a detailed microscale analysis of raw materials and slag-soil mixes with scanning electron microscopy, X-ray diffraction, X-ray fluorescence, Raman spectroscopy, thermogravimetric analysis, and derivative thermogravimetry. Their compaction behaviour, unconfined compressive strength (UCS), CBR index, swelling, and resilient modulus were also determined. Filler effects, cementitious, pozzolanic, and ion-exchange reactions were discussed. A positive synergistic behaviour was observed when combining 10% LFSF and 5% EAFSF (by soil weight), which provided a structural arrangement that provided increases in UCS and CBR up to 651% and 1500%, respectively
ISSN:1468-0629
2164-7402
DOI:10.1080/14680629.2023.2268723