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当钢筋周围混凝土孔隙液的游离Cl-超过临界氯离子浓度(cCl-)时,混凝土结构内的钢筋就会易于腐蚀。所以cCl-是暴露于氯离子环境的混凝土结构寿命预测的一个重要指标。特别在高温地区,钢筋混凝土结构破坏更严重。通过研究高温条件对钢筋腐蚀cCl-的影响。试验在50℃模拟孔隙溶液中进行,采用恒电位方法,考虑不同pH值的影响,得到具有95%保证率的临界氯离子浓度值。试验研究发现,在50℃溶液中钢筋腐蚀临界氯离子浓度比常温(25℃)下得到的结果小得多,而且温度的影响作用随着控制电位的下降和pH值的上升越明显。最后给出了温度与临界氯离子浓度的关系曲线。
When the free Cl- in the concrete pore fluid around the rebar exceeds the critical chloride ion concentration (cCl-), the reinforcement within the concrete structure tends to corrode. Therefore cCl- is an important indicator of the life expectancy of concrete structures exposed to chloride ions. Especially in high temperature areas, reinforced concrete structures more serious damage. By studying the high temperature conditions on the corrosion of steel cCl-. The experiment was carried out in a simulated pore solution at 50 ° C, using a constant potential method, taking into account the influence of different pH values, to obtain a critical chloride ion concentration value with a 95% guaranteed rate. The experimental results show that the critical chloride concentration of steel corrosion at 50 ℃ is much lower than that at normal temperature (25 ℃), and the influence of temperature is more obvious with the decrease of control potential and pH value. Finally, the relationship between temperature and critical chloride concentration is given.