Multiphasic modeling of hydration degree for blended cement pastes by using calorimetry method

The evolution of the mechanical properties of concrete depends greatly on the hydration of the component binders such as cement and mineral additives. However, the prediction of the hydration degree of these binders is extremely difficult due to the complex physic-chemical mechanisms at the molecular level. In this article, the author proposes to use a multiphasic model that considers hydration development and chemical interaction between reactions while taking into account temperature and water content effects on reaction kinetics. The main goal of this study is a semi-adiabatic calorimetry test was applied to determine the input parameters by measuring the heat release during hydration. Based on the test results shown the application of three cases of blended cement paste samples is considered to show the efficiency of the model. Overall, thermogravimetric analyses and its derivative are applied to verify the delay effect of pozzolanic reactions on the hydration degree induced by portlandite content in the paste.