Modelagem da reação de hidratação do cimento Portland utilizando métodos de calorimetria

Abstract

This dissertation presents a homogenization model for predicting adiabatic temperature rise from theoretical microconcrete (made from class G cement or CPII-E cement, limestone filler and natural fine aggregate) using the thermal properties of its components. The proposed model uses primary output data from isothermal calorimetry tests and homogenized specific heat values, in order to simulate a concrete mass under adiabatic conditions, avoiding tests in long and costly circumstances. In addition, this work presents an extrapolation model for isothermal calorimetry, in order to reduce the amount of data used in the adiabatic simulation model. Finally, the adiabatic simulation model is validated with an experimental database of conventional concretes and later applied to the theoretical microconcretes. The simulation model proved to be efficient, but prone to greater errors when sensitive variables are changed (activation energy). Besides the extrapolation model limitations, it shows efficiency on specific situations of temperature and paste composition.