关键词: 土壤环境;脉冲电场;硫酸盐侵蚀;水泥基材料;城市轨道交通系统

Abstract: Sulfate and electrical pulse acted together under soil environment to simulate the urban railway system and study the effect on cement-based materials.The changes were analyzed by appearance corrosion , corrosion resistant coefficient , distribution of sulfate ions , scanning electron microscope ( SEM/EDS)and X-ray diffraction(XRD).The results show that the electrical pulse accelerated the migration of sulfate ions in specimens .The amount of specimens with electrical field is 2-4 times as those without electrical field;the decrease of compressive strength with electrical field is 4-10 times as those without electrical field .It shows cement-based materials of urban railway system suffer more severe sulfate attack , so some measures should be taken to prevent and slow down the effect .

Key words: soil environment;electrical pulse;sulfate attack;cement-based material;urban railway system