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Thus, the physical barrier imposed to simulate service structural conditions during
firing played an efficient role on the castables¡¯ performance. For the testing under constraint conditions (Table 2), the reduction in the PLC and porosity level is noticeable and more evident when increasing the MgO grain size (which leads to higher PLC when the expansion is allowed). For all samples, the constraint forced the volumetric expansion to fill in the castables¡¯ intrinsic porosity, leading to a higher densification.

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