1. Interactions between alkali-activated ground granulated blastfurnace slag and organic matter in soil stabilization/solidification
- Author
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Julien Waligora, Laurent Frouin, Thomas Wattez, Martin Cyr, Cédric Patapy, Laboratoire Matériaux et Durabilité des constructions (LMDC), Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Institut National des Sciences Appliquées (INSA)-Université de Toulouse (UT)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT), Université Toulouse III - Paul Sabatier (UT3), Université Fédérale Toulouse Midi-Pyrénées-Université Fédérale Toulouse Midi-Pyrénées-Institut National des Sciences Appliquées - Toulouse (INSA Toulouse), and Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)
- Subjects
chemistry.chemical_classification ,Thermogravimetric analysis ,Soil organic matter ,0211 other engineering and technologies ,Slag ,chemistry.chemical_element ,Transportation ,02 engineering and technology ,Geotechnical Engineering and Engineering Geology ,[SPI]Engineering Sciences [physics] ,[SPI.GCIV]Engineering Sciences [physics]/Civil Engineering ,chemistry.chemical_compound ,Chemical engineering ,chemistry ,Sodium hydroxide ,Aluminium ,visual_art ,021105 building & construction ,visual_art.visual_art_medium ,Organic matter ,Reactivity (chemistry) ,Chemical composition ,ComputingMilieux_MISCELLANEOUS ,021101 geological & geomatics engineering ,Civil and Structural Engineering - Abstract
This paper presents novel findings regarding the use of alkali-activated slag for the development of road applications and, more particularly, how the interactions that occur between the binder and the organic matter originally present in the soil can strongly affect its reactivity in the process of stabilization and solidification. The study uses mechanical performances and macroscopic characterization, such as isothermal calorimetry and thermogravimetric analysis of the pure binders as well as of the soil-binder mixes in order to characterize the hydration mechanisms. By analyzing the chemical composition of organic matter extracted with three different alkaline activators, it is shown that both humic and fulvic acids are strong complexing agents, not only of calcium and aluminum ions, as noted in the existing scientific literature, but also of highly soluble silicon. In this study, only sodium hydroxide activated slag was found to be a suitable alkali-activated binder for subbase layer development.
- Published
- 2021