Nucleation in Clinker-Free Cementitious Systems Using Nano-Seeding: Mechanisms, Kinetics, and Performance Optimization

This dissertation will focus on clinker-free cementitious binders as a promising approach for reducing CO₂ emissions associated with construction materials. Despite their potential, their wider application is currently limited by an insufficient understanding and control of early hydration processes. The research will therefore aim to improve the fundamental knowledge of hydration kinetics and microstructural development in aluminosilicate calcium systems, with particular emphasis on the role of heterogeneous nucleation during the early stages of reaction.

The work will investigate the control of nucleation processes through the application of nano-seeding strategies. Model nano-seeds with well-defined particle size and surface chemistry will be employed, together with nano-particles derived from secondary raw materials, in order to quantify their influence on hydration kinetics, nucleation site density, and the formation of hydration products.

A multiscale experimental approach will be adopted, combining calorimetric measurements, phase analysis, and detailed characterization of microstructure and mechanical properties. This will enable the establishment of relationships between the properties of nano-seeds and the time-dependent evolution of the material.

The outcome of the dissertation will be the development of a mechanistic framework enabling the predictive design of sustainable, low-carbon cementitious binders. The results will contribute to the advancement of environmentally friendly construction materials and support the transition toward more sustainable construction practices.