Prediction of total chloride content profile and concentration/time-dependent diffusion coefficients for concrete
Prediction of total chloride content profile and concentration/time-dependent diffusion coefficients for concrete
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DOI：
10.1680/macr.1998.50.1.37
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发表时间：
1998-03
影响因子：
2.7
通讯作者：
R. Dhir;Martyn Jones;S. Ng
中科院分区：
文献类型：
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作者：
R. Dhir;Martyn Jones;S. Ng
本文提出了一种新的方法来确定的总氯离子含量剖面和浓度/时间依赖的扩散系数的水饱和混凝土（即混凝土的扩散是占主导地位的渗透过程）由于氯离子的侵入。开发的数学模型主要是基于这样的假设，即在一个半无限的介质中的总氯化物含量分布可以表示为玻尔兹曼变量的指数衰减函数。这一假设和模拟结果已被发现与发表的实验数据吻合良好。对于典型的结构混凝土，几个月以内的试验期被认为是足够的。可以容易地预测非稳态和稳态条件的曲线。实验工作只涉及几个测量的总氯化物含量的混凝土样品在不同的时间加上传统的渗透试验。这种方法的优点在C…
This paper presents a new approach to the determination of the total chloride content profile and the concentration/time-dependent diffusion coefficients for water-saturated concrete (i.e. concrete where diffusion is the dominant permeation process) due to the ingress of chloride ions. The mathematical models developed are primarily based on the assumption that the total chloride content profile within a semi-infinite medium can be expressed as an exponential decay function of the Boltzmann variable. This assumption and the simulation results have been found in good agreement with published experimental data. A test period of less than several months for typical structural concrete is believed to be sufficient. The profiles of both the non-steady state and the steady state conditions can easily be predicted. Experimental works involve only a few measurements of the total chloride content of concrete samples at different times plus a conventional penetration test. The advantages of this approach over the c...