Speaker
Description
Lignin, the second most abundant biopolymer in plant structures after cellulose, is produced at a rate of approximately 50 million tons per year during industrial paper manufacturing. Lignosulfonates, derived from the sulfonation of lignin, are water-soluble anionic polyelectrolyte polymers that find widespread applications in various industries. In concrete technology, lignosulfonates are frequently used due to their water-reducing effects and ability to delay the setting time. Moreover, using lignosulfonates as environmentally friendly alternatives to fossil fuel-based chemical admixtures plays a crucial role in reducing CO₂ emissions and promoting sustainability. Their production from waste lignin also offers significant cost advantages for construction materials. Ternary-based cementitious systems that combine calcium aluminate cement (CAC), Portland cement (PC), and a calcium sulfate source (CŠ) have rapid reaction and achieve high early-age strength. However, the extremely short setting times associated with these systems often negatively affect workability, limiting their practical use in ready-mix concrete applications. This study investigated the effects of sodium lignosulfonate (Na-LS) dosages on the fresh and hardened properties of ternary-based cementitious composites. Na-LS were blended at various ratios with a polycarboxylate ether-based high- range water- reducing admixture (HRWRA), while maintaining a constant total admixture content of 2% by binder weight. Na-LS contents were varied at 0%, 0.5%, 1.0%, 1.5%, and 2.0%. Setting time, flow diameter, early-age compressive strength, water absorption, and transport properties of mixtures were evaluated. The results demonstrated that increasing the Na-LS content significantly enhanced the flowability and extended the setting time of the mixtures without substantially compromising early-age mechanical performance. The combined use of Na-LS and HRWRA offers a promising approach for improving the balance between early strength development and workability in ternary cementitious systems, making them more suitable for practical construction applications.
Affiliations
Gazi University, Department of Civil Engineering, Ankara, Türkiye, 06500
damlanur.celik@gazi.edu.tr
| Title | Influence of Sodium Lignosulfonate on the Performance of Ternary Based Cementitious Composites |
|---|---|
| Keywords | ternary-based systems, fresh-state performance, chemical admixtures, early-age strength, waste valorization. |