基于干湿循环法的锂渣混凝土对氯离子吸附性能研究

Study on Chloride Ion Adsorption Performance of Lithium Slag Concrete Based on Dry-Wet Cycle Method

混凝土结构所处的工作环境中,干湿循环往往是导致结构出现严重锈蚀问题的环境之一。在干湿循环作用下,混凝土结构耐久性一般弱于处在干燥或完全浸泡环境下的混凝土结构,因此,在设计和使用时需要进行重点考虑。本文通过干湿循环法研究了高浓度氯盐环境下锂渣混凝土的氯离子吸附性能。针对干湿交替环境,探讨了锂渣掺量、抗压强度、扩散深度、氯盐浓度及侵蚀时间等因素对锂渣混凝土的氯离子吸附性能的影响。结果显示,随着混凝土所处环境中相对湿度发生变化,其对氯离子的吸附能力也随之变化,并呈现出一定的规律性。基于上述实验结果,本研究对处于干湿循环下锂渣混凝土在工程应用过程中提供了一定的参考意义。

In the working environment of the concrete structure, the dry-wet cycle was often one of the environments that lead to the serious corrosion of the structure. Under the action of dry-wet cycle, the durability of concrete structure was generally weaker than that of concrete structure in dry or completely soaked environment, so it needed to be considered in design and use. In this paper, chloride ion adsorption performance of lithium slag concrete in high concentration chloride salt environment was studied by dry-wetting cycle method and the effects of lithium slag content, compressive strength, diffusion depth, chloride salt concentration and erosion time on the adsorption performance of chloride ions in lithium slag concrete were discussed. The results showed that the adsorption capacity of chloride ion was changed along with the change of relative humidity in the environment of concrete and presented certain regularity. Based on the above experimental results, this study provided certain reference significance for the engineering application of lithium slag concrete under the dry-wet cycle.