Physico-Chemical Mechanisms of Shrinkage in Alkali-Activated Materials and Design of Mitigation Strategies

Alkali-activated materials (AAMs) represent a promising alternative to traditional cementitious binders, with significant potential to reduce the environmental impact of the construction industry. However, their broader application is limited by pronounced shrinkage, which negatively affects durability, crack formation, and the long-term stability of the material. The proposed research topic is focused on the systematic investigation of the physico-chemical mechanisms of shrinkage in AAMs, including autogenous and chemical shrinkage, with an emphasis on the relationships between microstructure, precursor type, activator composition, and the development of the pore system. The research will combine experimental approaches (e.g., calorimetry, sorption analysis, SEM/EDS) with advanced data interpretation. Based on the acquired knowledge, strategies for shrinkage mitigation will be proposed and validated, including mix design optimization, modification of the pore structure, the use of admixtures or fibers, and control of curing conditions. The aim of the work is to contribute to a deeper understanding of AAM behavior and to provide a basis for their more reliable application in engineering practice.