Microstructure Characterization and Micromechanical Modelling of Cement Pastes Hydrated at Different Temperatures

摘要

The hydration temperature has a considerable effect on the microstructure of cement paste and its mechanical properties. The present work aims to study the influence of hydration temperature on the mechanical properties of cement paste via micromechanical modelling. We will first characterize the microstructure of a class G cement paste hydrated at different temperatures, between 7 and 90°C. Then, the influence of the microstructure variations on the elastic properties of the hardened cement paste will be explored. The analysis of the microstructure enabled determining accurately the volume fractions of different phases present in the microstructure which is an essential input for the micromechanical modelling of its elastic properties. A multiscale self-consistent homogenization model is used based on these results to simulate the variations of the mechanical properties of hardened cement paste with hydration temperature. The results are compared with macro-scale experimental results of uniaxial compression tests.