摘要
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 various marine environment factors that affect the chloride ion erosion, by means of analyzing chloride ion erosion mechanism in reinforced concrete, chloride ion transport calculation model under the marine environment including sunshine, tide and temperature was established. Based on the convection-diffusion transmission model, this model was applied to dynamically coupling calculation of temperature field, humidity field and chlorine ion concentration field in the whole life cycle of concrete structures using finite difference method. In the model, the ASHRAE model was plugged in, and the differences of moisture diffusion and physical field boundary conditions in dry-wet process caused by tidal water level cycles were considered. The ratio of chloride ion to pore fluid was taken as concentration index. The calculated results of every module were validated by test data, and showed good agreement. The model may provide valuable references for marine concrete durability design.
出处
《天津大学学报（自然科学与工程技术版）》
EI
CSCD
北大核心
2016年第4期333-340,共8页
Journal of Tianjin University：Science and Technology
基金
国家创新研究群体科学基金资助项目(51021004)
国家国际科技合作专项资助项目(2012DFA70490)
关键词
氯离子
耐久性
海洋环境
对流
扩散
chloride ion
durability
marine environment
convection
diffusion
