In order to effectively compensate for bulk shrinkage of cement systems, the reaction of expansive additives must be regulated taking into account the development of cement hydration. In this study, nano-MgO particles (NM) with controlled reactivity were added to a cement system. The reactivity of NM was regulated via heat-treatment and the cement systems were investigated using isothermal calorimetry. Our results showed that increase in heat-treatment temperature resulted in coarsening of the NM and retardation of the NM reaction. We demonstrated that the addition of NM, heat-treated at low temperature, to a cement system caused significant reduction in the induction period compared to the reference system without NM. Controlling the reactivity of NMs might be a promising method in designing zero-shrinkage cement systems.

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