OPTIMISATION OF THE HARDENING PROPERTIES OF REFRACTORY CASTABLES USING NON-DESTRUCTIVE TECHNIQUES TO MEASURE EARLY AGE PROPERTIES

There is a need for better information about the early age hardening profile and volume change characteristics that can help the formulator optimise the castable binder systems. An approach by which the early age properties of refractory castables can be followed using two complementary techniques is presented. The techniques measure hardening kinetics through ultrasonics and early age linear shrinkage through a unique piece of equipment. Both can be done in an automated and continuous fashion. Different model castable formulations are presented and comparisons are made with existing tests such as flow, set, and compressive strength measurements to demonstrate the additional information that can be gained. Conclusions are drawn about the impact of changes in binder composition and their effects on the castable hardening. 25 refs.