Open AccessLothenbach’s Model of Von Mises Stress Distribution in Portland Cement in Curing and Temperature Gradient Conditions
Author(s) -
Yu. A. Abzaev,
A. I. Gnyrya,
С. В. Коробков
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1079/6/062001
Subject(s) - von mises yield criterion , portland cement , materials science , superposition principle , cement , temperature gradient , curing (chemistry) , composite material , finite element method , stress (linguistics) , mechanics , structural engineering , engineering , mathematics , physics , mathematical analysis , linguistics , philosophy , quantum mechanics
The paper presents the two-dimensional Lothenbach’s model of Portland cement curing based on the finite element method. The cement curing lasts for 7 days in the temperature gradient conditions ranging from 65 to −20 °C. A cement rod 7×70 cm in size is used for modelling the temperature and von Mises stress distributions. It is shown that in the temperature gradient and curing conditions, the stress maximum in Portland cement shifts toward the hot edge of the cement rod and exceeds the minimum stress level more than two times. The stress growth is significant at the interfaces between the concrete timber and the cement rod, especially at its cold edge. Such a distribution of von Mises stress is connected with the heat flow generation and their superposition with reverse heat flows. At the interfaces, superposition of the negative heat flows generates higher stresses, than superposition of the positive heat flows. The concrete timber and the interface stability are the additional factors that increase the stress level and contribute to the fracture of the pore walls.