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Sustainable Use of Leonardite Biopolymers as a Green Alternative in Soil Improvement Methods

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Published in:Archives of Mining Sciences vol. 70, no. 3 (2025), p. 493-505
Main Author: Keskin, Inan
Other Authors: Kahraman, Selman, Vakili, Amir Hossein, Kocaman, Ayhan, Tatar, Nurullah, Turan, Metin
Published:
Polish Academy of Sciences
Subjects:
Curing
Triaxial tests
Sustainable use
Calcite
Microstructural analysis
Compressive strength
Voids
Biopolymers
Mechanical tests
Carbonyls
Functional groups
Soil improvement
Internal friction
Mechanical properties
Carbonyl compounds
Curing (processing)
Clay
Civil engineering
Sustainable materials
Spectrum analysis
Particle size
Environmental
Online Access:Citation/Abstract
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Abstract:Leonardite’s ability to stabilise marl, a challenging construction material, was confirmed through mechanical tests, including unconfined compressive strength, unconsolidated undrained triaxial tests, and chemical and microstructural analyses. Results confirmed that the strength improvement factor, cohesion improvement factor, and internal friction improvement factor significantly increased due to both the addition of Leonardite and the curing times. The addition of 15% Leonardite, along with curing periods of 7 to 14 days, resulted in considerable improvement factors ranging between 2 and 5, depending on the parameters investigated. Microstructural analysis confirmed that Leonardite could act as a filler, filling soil voids and reducing peaks associated with calcite content, which is responsible for the unfavorable behavior of marls. The formation of various functional groups and strong bands, such as carboxyl, hydroxyl, and carbonyl, as evidenced by FTIR analysis, was found to be responsible for improving the mechanical strength of samples containing Leonardite.
ISSN:0860-7001
1689-0469
DOI:10.24425/ams.2025.156295
Source:Materials Science Database