Numerical study on the full age strength of concrete based on its microstructure
In order to establish a quantitative relationship between microstructure and macroscopic strength of concrete and further calculate its macroscopic strength,a multiscale geometric model of concrete was recon-structed according to the scale characteristics of constituent materials,and a multiscale stress response equation of concrete was presented based on equivalent inclusion theory.A multiscale mechanical model of uniaxial strength of concrete was established using the Drucker-Prager yield criterion,which was verified via its calcu-lated data and experimental results in the literature.By performing a numerical simulation,the evolution of concrete strength during the curing and the influence of microstructural parameters on the concrete strength were analyzed.Results show that the more the geometry of hydration products deviates from spheroid,the higher the strength of concrete is,and there can occur the highest strength of concrete if hydration products with the shapes of prolate and oblate spheroid are perpendicular and parallel to loading direction,respectively.The established model can calculate the uniaxial strength of concrete during the curing based on its microstruc-ture considering the geometric shape,particle gradation,spatial distribution,random orientation and interac-tion of constituent materials.
万方数据
维普
