预应力混凝土中氯离子扩散模型分析

Diffusion model of chloride ion in prestressed concrete

基于Fick第二定律,考虑预应力、温度、混凝土氯离子结合能力、氯离子扩散系数的时间依赖性和结构缺陷等多方面因素的影响,建立了预应力混凝土结构中氯离子扩散模型。通过试验数据,对建立的氯离子扩散模型进行了验证。研究结果表明:在盐雾环境下,混凝土氯离子浓度的实测值与本研究氯离子扩散模型预测的氯离子浓度相符合。为氯盐环境下的预应力混凝土结构耐久性研究提供了理论依据。

An chloride ion diffusion model of prestressed concrete was established based on the second Fick＇s Law ,many influence factors were considered ,which included prestressed force, temperature, combining capacity between concrete and chloride ions, time dependency of chloride ion penetration and structure defect. And the model was verified through experiment dates eventually.The research results show that the actual values of chloride ion concentration under the salt-spray environment is in accordance with the corresponding results obtained by the model, which provides theoretical foundation for prestressed concrete structures under the salt-spray environment.