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In order to achieve durable concrete structures, concrete code provisions typically require a minimum cement content, a maximum water cement ratio, and a minimum strength class.These deemed-to-satisfy rules are mainly based on long-term practical experience.However, as there is a clear trend to use new binder types,considering alternative cement-replacing and environment-friendly powders, this prescriptive approach can be criticized.Classical definitions like cement content and water cement ratio are open to heavy debate in case of the alternative binder systems.