首页|A multiscale model for predicting the Young's modulus and the thermal-expansion coefficient of concrete at high temperatures
A multiscale model for predicting the Young's modulus and the thermal-expansion coefficient of concrete at high temperatures
扫码查看
点击上方二维码区域，可以放大扫码查看
原文链接
NETL
NSTL
Elsevier
A semi-analytical micromechanical model is proposed to predict the evolution of the Young's modulus and thermal-expansion coefficient of concrete at elevated temperatures, considering three scales of observation, namely cement paste, mortar and concrete. After validation with various experimental data sets, the model quantifies different sources of damage to concrete at elevated temperatures, indicating that the chemical decomposition of cement paste has a minor influence on the evolution of the Young's modulus, while the thermal degradation of the aggregate plays a major role. At higher temperatures, cracking is the main mechanism driving the reduction of the Young's modulus of the investigated concretes. With regard to the thermal-expansion coefficient evaluated at multiple scales, load-induced thermal strains highly effect the homogenized total strains at the mortar level. Moreover, it is demonstrated that the dehydration degree of C-S-H increases proportionally with the measured load-induced thermal strains.
Concrete at high temperaturesMicromechanicsThermal-expansion coefficientModulus of elasticityLoad-induced thermal strains
Simon Peters、Giao Vu、Guenther Meschke
展开 >
Institute for Structural Mechanics, Ruhr University Bochum, Universitaetsstrasse 150, 44801 Bochum, Germany
NETL
NSTL
Elsevier
