Modeling of chloride diffusivity coupled with non-linear binding capacity in sound and cracked concrete
Modeling of chloride diffusivity coupled with non-linear binding capacity in sound and cracked concrete
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DOI：
10.1016/j.cemconres.2009.07.014
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发表时间：
2009-10-01
影响因子：
11.4
通讯作者：
Anh, Ho Thi Lan
中科院分区：
文献类型：
--
作者：
Ishida, Tetsuya;Iqbal, Prince O'Neill;Anh, Ho Thi Lan
本研究的目的是建立一个模型，可以预测氯离子在声音和裂纹混凝土中的输运现象。考虑到复杂的微孔结构和氯离子与孔壁的电相互作用，基于计算微孔结构，考虑孔隙网络的弯曲度和收缩度作为还原因子，建立了氯离子扩散系数。在实际环境中，混凝土结构并非总是无裂缝的，因此，通过在控制体积内的截面大空隙空间来代表裂缝，并通过提出氯离子在裂缝区域的扩散率模型来模拟裂缝混凝土中的氯离子传输。所提出的模型被实现到模拟胶凝材料早期发展过程的有限元计算程序DuCOM中。通过与实验结果的比较，验证了计算得到的总氯离子浓度分布。2009爱思唯尔有限公司版权所有。
The objective of this research is to establish a model that can predict chloride transport phenomena in sound and cracked concrete. The chloride diffusivity is formulated based on computed micro-pore structure, which considers tortuosity and constrictivity of porous network as reduction factors in terms of complex micro-pore structure and electric interaction of chloride ions and pore wall. In the real environment, concrete structures are not always crack-free, therefore chloride transport in cracked concrete is also simulated by section large void spaces in a control volume to represent the crack and by proposing a model of chloride diffusivity through the cracked region The proposed models are implemented into a finite-element computational program DuCOM, which simulates the early-age development process of cementitious materials. The calculated concentration profiles of total chloride ions are verified through a comparison with experiments results. (C) 2009 Elsevier Ltd. All rights reserved.