Quantitative moisture model of interior concrete in structures exposed to natural weather
Quantitative moisture model of interior concrete in structures exposed to natural weather
复制标题
暴露于自然天气的结构内部混凝土的定量湿度模型
DOI：
10.1016/j.conbuildmat.2015.10.073
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发表时间：
2016
影响因子：
7.4
通讯作者：
Yu Zhiwu
中科院分区：
文献类型：
--
作者：
Liu Peng;Song Li;Yu Zhiwu
混凝土内部水分是直接影响混凝土结构劣化现象的主要因素。在这项研究中，提出了一种方法来预测自然环境和内部混凝土的湿度的基础上，相对湿度（RH）和水蒸气密度（WVD）的概念，使用气象数据。对环境和混凝土内部的水分变化进行了测量和建模。在试验验证的基础上，对湿度模型进行了扩展，利用月、年气象资料研究了湿度在环境中的作用谱和湿度在混凝土内部的反应谱。结果表明，由于混凝土的固有特性，在环境和混凝土内部，相对湿度和水蒸气湿度的特性各不相同。在大气中，相对湿度随日变化周期性地波动，而湿水汽含量仅表现出轻微的波动。在混凝土内部，WVD周期性波动，而RH相对稳定，并趋于一个常数超过临界深度。因此，建议使用由RH支持的WVD来定量表征水分，并且使用RH来定性表征水分。
The moisture in interior concrete is the primary factor directly influencing the deterioration phenomena of concrete structures. In this study, a method for predicting the moisture of the natural environment and the interior concrete was proposed based on the relative humidity (RH) and water vapor density (WVD) concepts using meteorological data. The variations of the moisture in the environment and the interior concrete were measured and modeled. After experimental validation, the moisture model was extended to investigate the action spectrum of humidity in the environment and the reaction spectrum of moisture in the interior concrete based on monthly and annual meteorological data. The results show that the characteristics of the RH and WVD differ from one another in both the environment and the interior concrete as a result of the intrinsic properties of the concrete. In the atmosphere, the RH fluctuates periodically with the diurnal cycle, whereas the WVD shows only slight fluctuations. In the interior concrete, the WVD fluctuates periodically, whereas the RH is relatively steady and tends towards a constant beyond a critical depth. Thus, it is proposed that the WVD, supported by the RH, be used to quantitatively characterize the moisture and the RH be used to qualitatively characterize the moisture.