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为澄清多种海洋环境要素对混凝土氯离子侵蚀的综合影响,在对混凝土氯离子侵蚀机理分析的基础上,建立了日照、潮汐、气温等海洋环境综合影响下的混凝土氯离子传输计算模型.该模型在传统对流-扩散模型中增加了ASHRAE晴空日照模型,并考虑了潮汐水位的周期变化导致的干湿两个过程中水分扩散以及水-土界面扩散等边界条件的差异,采取氯离子相对孔隙液的浓度作为控制指标,运用有限差分法,对海上混凝土结构全生命周期内的温度场、湿度场、氯离子浓度场进行动态耦合计算.通过试验实测数据对各模块计算结果进行验证,吻合良好.该模型对于海工混凝土的耐久性设计具有参考价值.
In order to clarify the comprehensive influence of various marine environmental factors on chloride ion erosion of concrete, chloride ion transport calculation model under the combined influence of sunshine, tide, temperature and other marine environments was established based on the analysis of chloride ion erosion mechanism of concrete. The model adds the ASHRAE clear sky sunshine model to the traditional convection-diffusion model, and takes into account the differences of the boundary conditions such as water diffusion and water-soil interface diffusion caused by the periodical change of tide water level. Taking the chloride ion relative pore Liquid concentration as a control index, the finite difference method is used to calculate the dynamic coupling of the temperature field, the humidity field and the chloride ion concentration field during the whole life cycle of the marine concrete structure.According to the measured data, the calculation results of each module are verified and agree well The model has reference value for the durability design of marine concrete.