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Blends of Ordinary Portland Cements (OPC) are widely used for the encapsulation of low-and intermediate-level radioactive waste, with the purpose to immobilize waste streams in a solid and durable monolithic matrix.The service life of OPC blends for nuclear waste immobilisation is influenced by its leaching behaviour, which directly affects mechanical properties.Hence, it is important to understand whether there exists a link between the hydration processes of OPC, associated microstructure developments, and sample leaching behaviour.The aim of this study is to optimize the leachability and mechanical property of OPC samples for nuclear waste immobilization application.