Hygro-thermo-chemical modeling of high performance concrete. I: Theory
Hygro-thermo-chemical modeling of high performance concrete. I: Theory
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DOI：
10.1016/j.cemconcomp.2009.02.015
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发表时间：
2009-05-01
影响因子：
10.5
通讯作者：
Cusatis, Gianluca
中科院分区：
文献类型：
--
作者：
Di Luzio, Giovanni;Cusatis, Gianluca
本文研究了一种新的高性能混凝土(HPC)湿热化学模型的建立、标定和验证，该模型适用于分析早期及以后的水分迁移和热传递。在本研究的第一部分，提出并详细讨论了这一理论表述。经典的宏观质量守恒定律和能量守恒定律是以湿度和温度为主要变量，通过明确考虑水泥水化、硅灰反应和硅酸盐聚合等各种化学反应而写成的。用经典的水化度概念来模拟水泥的水化效应。通过引入硅粉反应度和硅酸盐聚合物浓度及其演化规律，对硅粉反应和硅酸盐聚合进行了模拟。该模型能较好地模拟自加热、自干燥等早期老化现象。模型的数值实现、校准和与实验测试数据的比较验证推迟到本研究的第二部分[Di Luzio G，Cusatis G.高性能混凝土的水热化学模拟。II：数值实现、校准和验证。CEM Concr Compos，正在印刷中]。(C)2009爱思唯尔有限公司。保留所有权利。
This study deals with the formulation, calibration, and validation of a new hygro-thermo-chemical model for high-performance concrete (HPC) suitable for the analysis of moisture transport and heat transfer at the early age and beyond. In Part I of this study the theoretical formulation is presented and discussed in detail. Classical macroscopic mass and energy conservation laws are written by using humidity and temperature as primary variables and by taking into account explicitly various chemical reactions, such as cement hydration, silica fume reaction, and silicate polymerization. The effect of cement hydration is modeled through the classical concept of hydration degree. Silica fume reaction and silicate polymerization are modeled by introducing the degree of silica fume reaction and the concentration of silicate polymers, along with their evolution laws. The present model can simulate early age phenomena, such as self-heating and self-desiccation, with great accuracy. Numerical implementation, calibration and validation of the model by comparison with experimental test data are postponed to Part II of this study [Di Luzio G, Cusatis G. Hygro-thermo-chemical modeling of high performance concrete. II: Numerical implementation, calibration, and validation. Cem Concr Compos, in press]. (C) 2009 Elsevier Ltd. All rights reserved.