Mechanisms of Phase Transformation and Stabilization in Calcium Aluminate Cement Systems via Multi-Scale Additive Integration (M VILNIUS TECH

Overview

Subject “Mechanisms of Phase Transformation and Stabilization in Calcium Aluminate Cement Systems via Multi-Scale Additive Integration”

Calcium aluminate cements (CAC) represent a vital class of specialty binders tailored for extreme environments, including refractory linings, rapid-repair infrastructure, and chemically aggressive settings (e.g., sulfate and biogenic acid exposure). While CAC offers superior early-age strength and thermal shock resistance, its long-term structural integrity is compromised by the conversion of metastable hydrates CAH10 and C2AH8) into stable, high-density phases (C3AH6 and AH3). This chemical transition increases porosity and triggers significant loss in mechanical strength. This research aims to investigate the synergistic effects of nano- and micro-additives on the hydration kinetics of CAC. By targeting the stabilization of metastable phases or the redirection of hydration pathways, this study seeks to mitigate the conversion effect, ensuring long-term durability for critical applications such as cryogenic facilities, high-temperature foundries, and wastewater infrastructure. The proposed research seeks to investigate the mechanisms by which specific polymers and chemical additives function as "crystal growth inhibitors" within the cementitious matrix. The primary objective is to determine if the hydration process can be strategically manipulated to "trick" the cement into bypassing the formation of metastable phases entirely. By leveraging these additives to facilitate the immediate development of a stable, dense microstructure, the research aims to eliminate the traditional conversion cycle, thereby ensuring long-term structural integrity and superior mechanical performance.