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Today, as we move toward a low carbon society, an important issue is reducing CO2 emissions during the cement manufacturing process.Around the world, various admixtures that reduce the output of CO2 are now being included in cement mixes.Although this helps to solve one problem, the end-user cannot be sure of the amount and quality of admixture used, so problems arise relating to achieving stable concrete quality at the construction site.To improve this situation, the authors have designed a method of evaluation based on a conduction calorimeter.Cement generates heat of hydration as it reacts during the curing process, so continuous measurement of heat output is a simple analysis technique widely used in investigating the reactions of cement.