Improving asphalt concrete durability through soda lignin powder

•Soda lignin powder was derived from Pinus wood sawdust using an alkaline treatment.•The suitability of soda lignin powder as a modifier for asphalt was investigated through a series of experimental tests.•Asphalt binders with 2–6 % soda lignin powder demonstrated enhanced stiffness and reduced temp...

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Veröffentlicht in:Transportation engineering (Oxford) Jg. 19; S. 100300
Hauptverfasser: Albayati, Aya K., Albayati, Amjad H.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 01.03.2025
Elsevier
Schlagworte:
Biomass
Durability
Modified asphalt
Soda lignin
Sustainability
Durability
Biomass
Soda lignin
Sustainability
Modified asphalt
ISSN:2666-691X, 2666-691X
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Zusammenfassung:•Soda lignin powder was derived from Pinus wood sawdust using an alkaline treatment.•The suitability of soda lignin powder as a modifier for asphalt was investigated through a series of experimental tests.•Asphalt binders with 2–6 % soda lignin powder demonstrated enhanced stiffness and reduced temperature sensitivity.•An optimum soda lignin powder content of 6 % provided the best resistance to fatigue distress, permanent deformation, and moisture damage.•Soda lignin powder has the potential to produce durable asphalt concrete with improved resistance to various distresses. Lignin has emerged as a promising asphalt binder modifier due to its sustainable and renewable nature, with the potential to improve flexible pavement performance. This study investigates the use of Soda Lignin Powder (SLP), derived from Pinus wood sawdust via alkaline treatment, as an asphalt modifier to enhance mixture durability. SLP was characterized using Fourier Transformation Infrared Spectroscopy (FTIR), X-ray Diffraction (XRD), and Scanning Electron Microscopy with Energy Dispersive X-ray Analysis (SEM/EDX), revealing significant changes in its chemical structure post-extraction. These analyses showed the presence of phenolic units, including hydroxyphenyl propane, syringyl, and guaiacyl units. The morphology of SLP was identified as irregular and spherical particles consisting of carbon, oxygen, nitrogen, and sulfur. Experimental evaluations involved three SLP dosages (2 %, 4 %, and 6 % by weight of asphalt binder), with tests for penetration, softening point, ductility and rotational viscosity. Additionally, the asphalt mixtures were tested for their performance in terms of moisture susceptibility, resilient modulus, permanent deformation, and fatigue resistance. Results indicated that SLP effectively reduces the temperature susceptibility of asphalt by increasing its stiffness and rotational viscosity. Furthermore, mixtures with 6 % SLP showed enhanced moisture resistance, with a Tensile Strength Ratio (TSR) of 86.98 %, a 74.1 % reduction in accumulated permanent deformation at 10,000 cycles, and a 38.1 % increase in the Cracking Tolerance Index (CT index) compared to the control mix (0 % SLP content). These findings confirm that SLP has the potential to be an effective additive in the design of asphalt mixture. Moreover, it allows producing endurable mixtures with higher resistance to distress.
ISSN:2666-691X
2666-691X
DOI:10.1016/j.treng.2024.100300