This paper investigates some of the challenges linked to raw materials and how control of the interdependent reactions within a castable during the processing phases can be harnessed via the use of newly developed calcium aluminates and additive systems. These new calcium aluminates and additives deliver castables with both improved placing properties and more predictable behaviour. Experiments are conducted using parallel measurement techniques to evaluate wet mixed model systems through the phases of initial flow, flow decay and stiffening. Classical flow measurements are used to evaluate placing properties and these are coupled with ultrasonic measurements and exothermic profiles to assess castable hardening.
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