Application of Nuclear Magnetic Resonance Techniques in Iron-Rich Alkali-Activated Materials

Promovendus/a: Ziyou Yu

Promotor(en): Prof. dr. Dimitrios Sakellariou, Prof. dr. Yiannis Pontikes

Nuclear Magnetic Resonance (NMR) is a powerful tool for probing the inner structure of materials at the atomic level. My research applies NMR to investigate alkali-activated materials (AAMs) – sustainable alternatives to Portland cement that reduce CO₂ emissions by using industrial by-products like fly ash and slags.

A key challenge in studying iron-rich AAMs is the magnetic nature of iron, which distorts NMR signals. Rather than avoiding this, my work focuses on understanding and leveraging these paramagnetic effects to gain deeper insights into the materials' structure and behavior. By embracing these complexities, I developed NMR techniques to monitor iron oxidation states, pore structures, and material evolution over time. This allowed me to track how AAMs respond to environmental stress, such as acid attack, providing valuable information for enhancing their durability.

By utilizing paramagnetic effects in NMR, my research opens new pathways for characterizing iron-rich, eco-friendly building materials – contributing to more resilient and sustainable construction practices.