海洋大气区氯离子在混凝土中的沉积与传输行为研究综述

海洋大气区氯离子对钢筋混凝土的侵蚀行为可分为两个阶段,首先,氯离子在风力作用下附着在混凝土表面,其次,从混凝土表面向混凝土内部侵蚀。基于海洋大气区氯离子对混凝土侵蚀的全过程,对已有研究进行归纳总结,阐述了各影响因素对沉积过程的影响规律。其中,海水含盐量、风速、暴露时间与混凝土氯离子沉积量呈正相关关系,距海岸距离与混凝土氯离子沉积量呈负相关关系;论述了各影响因素对传输过程的影响规律,水灰比越大、暴露时间越长、温度越高、内外湿度梯度越大、碳化越严重越容易形成对流区。目前,针对海洋大气区氯离子在混凝土中沉积和传输行为开展研究多基于单因素,多因素耦合作用下的沉积和传输行为尚需进一步研究。

A review on the deposition and transport behavior of chloride ions in concrete in marine atmosphere

The erosion behavior of reinforced concrete by chloride ions in ocean atmosphere can be divided into two phases.At first, chloride ions attach to the surface of concrete under the action of wind, and then erode from the surface into the concrete.Based on the whole process of chloride ions erode on concrete in marine atmosphere, this article has summarized existing research both at domestic and abroad.On the one hand, this essay expounds the various influencing factors on the influence of deposition process, The salinity of seawater, wind speed and exposure time were positively correlated with the amount of chloride ion deposition in concrete, while the distance from the coast was negatively correlated with the amount of chloride ion deposition in concrete.On the other hand, discussing the influence of transfer process from the various influencing factors.The influence law of various influencing factors on the transmission process is discussed.The higher the water-cement ratio is, the longer the exposure time is, the higher the temperature is, the larger the internal and external humidity gradient is, and the more serious the carbonization is, the easier to form the convection zone.At present, the researches which aim at the deposition and transport behavior of chloride ions in marine atmosphere are based on single factor.The deposition and transport behaviors under the coupling of multiple factors need to be further studied.