The International Conference on Refractories (ICR 2025), held annually in Aachen, brings together leading academic and industrial players in the field to share the latest scientific and technological advances in refractory materials.
Within this context, the presentation given by Sandra Abdelouhab (BCRC-INISMa) focused on the early structuring mechanisms of refractory concretes bonded with silica gel, whether colloidal or micro-silica-based, as well as the effect of a hybrid bond induced by small additions of calcium aluminate cement.
The study, combining ultrasonic measurements and cold flexural strength tests, highlights the fundamental differences in setting mechanisms between hydraulically setting binders and sol-gel systems. It shows that small additions of CAC can accelerate gelation and hardening without compromising the "no-cement" nature of the material.
These results pave the way for the design of more durable printable refractory inks suitable for additive manufacturing processes using extrusion.
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