海洋环境中温湿度变化对混凝土氯离子传输研究

氯离子渗透到混凝土内部诱发钢筋锈蚀是海洋钢筋混凝土面临的耐久性关键问题。构建考虑骨料、浆体集料界面区的混凝土模型,建立了环境温度、湿度影响的氯离子传输模型,基于COMSOL数值模拟软件分析了材料、环境对混凝土氯离子传输的影响规律,并通过试验进行了验证。结果表明:模拟结果和试验数据具有较高的吻合度;随着温度的升高,氯离子扩散加快,而混凝土中氯离子的渗透深度随着内部湿度的增大而呈现减小趋势。混凝土中高致密骨料存在阻碍了氯离子传输,但界面区存在使得氯离子沿界面区传输并在骨料背后形成传输前锋。

Numercial simulation of chloride ions transportation considering temperature and humidity in marine environment

It is a significant issue of concrete durability in marine environment, where chloride ions penetrate into concrete, inducing corrosion of steel rebar. This paper proposes a numerical simulation of chloride ions transmission in concrete when temperature and humidity change. How material and environment influence the transmission of chloride is simulated and verified in the experiments. Comparison of the measured data with simulation results shows a good agreeement between them, which verifies that chloride ions diffusion increases as temperature increases, and chloride ions penetration depth decreases as humidity increases. High density of concrete aggregate hampers the chloride ion transportation, but the existence of interface area makes chloride ions transmit along the interface area, and transmission striker forms behind the aggregate formation.