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通过对混凝土热传导的细观特性分析,探讨混凝土的非均质特性对热传导过程的影响规律.假定混凝土由砂浆、粗骨料以及二者界面过渡区(ITZ)组成,利用Voronoi单元剖分技术建立细观格构网络模型,是开展热传导过程研究的新途径.基于非线性分析的热传导方程,利用伽略金加权余数法和有限差分法,确定其方程的数值形式,以水泥砂浆与花岗岩为例,开展了基于细观格构网络模型的混凝土热传导过程数值仿真分析.数值计算表明,混凝土的细观格构网络模型可有效地呈现其热传导过程,并可确定其内部温度场分布规律.
The influence of the heterogeneity of concrete on the heat conduction process is discussed through the analysis of the mesoscopic characteristics of concrete heat conduction.It is assumed that the concrete consists of mortar, coarse aggregate and the transition zone (ITZ) of the two, which is established by the Voronoi cell division technique Meso-grid network model is a new way to study the heat conduction process.Based on the nonlinear heat conduction equation, the numerical form of the equation is determined by using the Galerkin weighted residual method and the finite difference method, taking cement mortar and granite as examples , Numerical simulation analysis of concrete heat conduction process based on meso-grid network model is carried out.The numerical calculation shows that the meso-grid network model of concrete can effectively present the heat conduction process and determine the internal temperature distribution law.