烷氧基化咪唑啉阻锈剂对钢筋混凝土性能的影响

Effects of Alkoxylated Imidazoline Rust Inhibitors on the Properties of Reinforced Concrete

在海洋环境下钢筋混凝土结构因氯离子的腐蚀会过早破坏,添加阻锈剂可以提高钢筋混凝土的性能。通过电化学极化曲线及阻抗测试评价了不同添加量的烷氧基化咪唑啉阻锈剂对Q235碳钢在不同温度含3.5%(质量分数)NaCl的饱和Ca(OH)_2溶液中的阻锈性能,通过对混凝土的性能测试,研究了该阻锈剂对钢筋混凝土性能的影响。结果表明,烷氧基化咪唑啉阻锈剂的阻锈性能随着腐蚀体系温度的升高而增强,当阻锈剂添加量为40 g/L、测试温度在35℃时,阻锈效果最佳;并且该阻锈剂具有一定的引气性,能够增加混凝土的坍落度,降低水泥净浆的凝结时间,减小对水泥净浆流动度的影响,提高混凝土的力学性能及抗氯离子渗透性能。烷氧基化咪唑啉阻锈剂的加入改善了混凝土的内部结构,提高了混凝土的耐久性。

In the marine environment,reinforced concrete structures will be damaged prematurely due to chloride corrosion,and the addition of rust inhibitors can improve the performance of reinforced concrete.The rust inhibition performance of Q235 carbon steel in saturated Ca(OH)2 solution with a 3.5%NaCl mass fraction at different temperatures and additive amounts was evaluated using electrochemical polarization curves and impedance tests with alkoxylated imidazoline rust inhibitors.The effect of the rust inhibitor on the properties of reinforced concrete was also investigated through performance tests on concrete.The experimental results indicated that the rust inhibition capacity of alkoxylated imidazoline rust inhibitors increased with the temperature of the corrosion system,with the best rust inhibition effect achieved when the additive amount was 40 g/L at a test temperature of 35℃.Moreover,the rust inhibitor was shown to possess certain air-entraining properties,which increased the slump of concrete,reduced the setting time of cement mortar,minimized the impact on the fluidity of cement mortar,and improved the me-chanical properties of concrete and its resistance to chloride ion penetration.The addition of the alkoxylated imidazoline corrosion inhibitor im-proved the structure and durability of the concrete.