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海洋潮汐浪溅区混凝土表面氯离子浓度的改进计算模型
蔡荣1, 杨绿峰2,3,4, 余波2,3,4
1.广西财经学院 建设处, 南宁 530008;2.广西大学 土木建筑工程学院;3.工程防灾与结构安全教育部重点实验室;4.广西防灾减灾与工程安全重点实验室, 南宁 530004
摘要:
收集世界不同地区304组海洋潮汐浪溅区自然暴露混凝土的试验数据,据此分析水胶比、胶凝材料种类和暴露时间对混凝土表面氯离子浓度Cs,ts的影响规律,进而结合二阶段多元非线性回归分析,分别确定了硅酸盐水泥、粉煤灰、矿渣和硅灰等胶凝材料对Cs,ts的修正系数,建立了海洋潮汐浪溅区Cs,ts的改进模型,并利用现有模型和试验数据对比,验证了该模型的适用性。分析表明:Cs,ts与水胶比之间近似呈线性关系,且胶凝材料种类对Cs,ts的影响显著;Cs,ts在前5 a内快速增长,随后逐渐趋于稳定,可以利用指数型函数来描述其时变规律。
关键词:  潮汐浪溅区  混凝土  氯离子浓度  回归分析  胶凝材料
DOI:10.11835/j.issn.2096-6717.2019.079
分类号:TU311.3
基金项目:国家自然科学基金(51678165、51668008);广西自然科学基金(2018GXNSFAA281344)
Improved model for surface chloride concentration of concrete in marine tidal and splash zones
Cai Rong1, Yang Lufeng2,3,4, Yu Bo2,3,4
1.Department of Construction, Guangxi University of Finance and Economics, Nanning 530008, P. R. China;2.School of Civil Engineering and Architecture;3.Key Laboratory of Engineering Disaster Prevention and Structural Safety of Ministry of Education;4.Guangxi Key Laboratory of Disaster Prevention and Engineering Safety, Guangxi University, Nanning 530004, P. R. China
Abstract:
The influences of water-to-binder ratio, binder type and exposure time on the surface chloride concentration Cs,ts of concrete exposed to marine tidal and splash zones were investigated systematically in this study based on 304 sets of field test data selected from different sites around the world. Then, the correction factors of four binder types can be determined using the two-phase multiple nonlinear regression technique, including the ordinary Portland cement, fly ash, slag and silica fume. Finally, an improved model for Cs,ts was developed. The applicability of the improved model for Cs,ts was validated in comparison with existing models and field test data. Analysis results show that the surface chloride concentration increases linearly with water-binder-ratio, while the influence of binder type on Cs,ts cannot be ignored. Moreover, Cs,ts increases over exposure time exponentially, which appears a fast increase in the first 5 years and then becomes constant.
Key words:  tidal and splash zones  concrete  chloride concentration  regression onalysis  binder
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