干湿交替氯盐环境下氧化石墨烯水泥砂浆抗侵蚀研究

Erosion Resistance of Graphene Oxide Cement Mortar under Dry-Wet Alternating Chloride Environment

抗氯离子侵蚀能力的强弱对水泥基材料服役寿命长短有着关键性的影响。本文研究了不同氧化石墨烯(GO)掺量(0%、0.02%、0.04%、0.06%、0.08%、0.10%,质量分数)在干湿交替氯盐环境下对水泥砂浆抗氯离子侵蚀性能的影响,分析了不同GO掺量下自由氯离子浓度与水泥砂浆抗氯离子侵蚀性能之间的关系,并利用扫描电子显微镜从微观角度分析水泥砂浆的抗侵蚀性能。结果表明:GO能显著提高水泥砂浆的抗氯离子侵蚀能力,最佳掺量范围为0.04%~0.06%;在同一钻孔深度处,水泥砂浆内的自由氯离子浓度随着GO掺量的增加先降低后升高;GO能有效调节水泥砂浆的微观形貌,减少内部孔隙产生,密实结构,提高水泥砂浆抗氯离子侵蚀能力。

The strength of resistance to chloride ion erosion has a key impact on the service life of cement-based materials. In this paper, the effect of different graphene oxide(GO) content(0%, 0.02%, 0.04%, 0.06%, 0.08%, 0.10%, mass fraction) on chloride ion erosion resistance of cement mortar under dry-wet alternating chloride environment was studied. The relationship between free chloride ion concentration and chloride ion erosion resistance of cement mortar under different GO content was analyzed, and the chloride ion erosion resistance of cement mortar was analyzed from micro perspective by scanning electron microscope. The results show that GO can significantly improve the chloride ion erosion resistance of cement mortar and the optimal content range is 0.04%~0.06%. At the same drilling depth, the free chloride ion concentration in cement mortar decreases first and then increases with the increase of GO content. GO can effectively regulate the microscopic morphology of cement mortar, reduce the generation of internal pores, make the structure more dense, and improve the ability of cement mortar to resist chloride ion erosion.