This dissertation will focus on the development and optimization of magnesium silicate hydrate (M-S-H) binders incorporating alternative sources of silicon dioxide, including industrial by-products, waste materials, and naturally occurring reactive precursors. The aim will be to contribute to the advancement of sustainable construction materials by partially or fully replacing conventional cementitious systems with low-carbon alternatives, thereby reducing the environmental impact associated with Portland cement production.
The physicochemical properties of selected silica-rich materials will be systematically investigated, along with their reactivity within the MgO–SiO₂ system and their influence on the formation of M-S-H phases. Attention will be paid to hydration kinetics, phase development, and the mechanisms governing binder formation. Rheological properties will be adjusted to ensure adequate workability, especially with respect to applications in 3D printing technologies.
Comprehensive characterization of both fresh and hardened composites will be carried out, with emphasis on the relationships between material composition, microstructure, and resulting macroscopic properties. Mechanical performance, including strength and fracture resistance, as well as hygrothermal behaviour, will be evaluated to assess the suitability of the developed materials for construction applications.
The long-term durability of M-S-H-based materials will be examined, including their resistance to freeze–thaw cycles, salt crystallization, and chemical degradation. Environmental performance will be assessed through leaching tests and life cycle assessment (LCA), providing a holistic evaluation of sustainability.
By integrating principles of circular economy, waste valorisation, and sustainable material design, innovative, eco-friendly, and 3D-printable construction materials will be developed. The expected outcomes will contribute to the advancement of next-generation cementitious materials and support the transition toward more sustainable construction practices.
