Lignin-Based Admixtures: A Scientometric Analysis and Qualitative Discussion Applied to Cement-Based Composites

Area of Science:

• Materials Science
• Chemical Engineering
• Sustainable Construction

Background:

• Lignin-based admixtures (LBAs) are emerging materials for cement-based composites, utilizing residual lignins from biorefineries and pulp/paper mills.
• LBA research has significantly grown in the last decade, presenting an opportunity for waste valorization and sustainable material development.

Purpose of the Study:

• To conduct a scientometric analysis and qualitative review of lignin-based admixtures (LBAs) in cement-based composites.
• To identify key research trends, influential sources, and knowledge gaps in LBA development and application.

Main Methods:

• Scientometric analysis of 161 selected articles to map the research landscape of LBAs.
• In-depth qualitative review of 37 selected papers focusing on LBA development.

Main Results:

• Identified key publication sources, frequent keywords, influential researchers, and leading countries in LBA research.
• Classified developed LBAs into plasticizers, superplasticizers, set retarders, grinding aids, and air-entraining admixtures.
• Highlighted a focus on Kraft lignins and fresh-state properties, with a need for more research on biorefinery lignins and hardened-state properties.

Conclusions:

• LBA research is a growing field with significant potential for sustainable construction.
• Future research should prioritize biorefinery lignins and evaluate hardened-state properties for comprehensive LBA assessment.
• This review serves as a reference for researchers, industry professionals, and funding bodies in the LBA domain.