【摘要】 基于模拟盾构管片裂缝,采用不同材料对裂缝修补,通过测试氯离子扩散系数和经硫酸盐侵蚀后的抗压和抗折强度,得到不同材料修补管片裂缝后的抗盐蚀性能.结果表明:丙烯酸酯共聚乳液(BR)和环氧树脂(HY)修补后,管片抗Cl~-渗透能力有所下降,Cl~-扩散系数较原基体增大了20%和8.7%;而聚氨亚酯修补材料(JZ)以及新型修补材料(XC)修补后的抗Cl~-渗透性均有所增强,较原基体分别下降了11.9%和10.1%.不同材料修补后抗硫酸盐侵蚀能力均有所降低,其中HY修补后经硫酸盐侵蚀后的抗压强度是未侵蚀试件的95.7%,降幅最小,JZ修补后经硫酸盐侵蚀后的抗折强度是未侵蚀试件的75.6%,降幅最小.更多还原

【Abstract】 Research on salt corrosion resistance after segment’s crack repairing is little.Based on simulating the shield crack of the segment,different materials are used to repair and the salt erosion resistance is obtained by testing the chloride ion diffusion coefficient and the compressive and flexural strength after eroded by sulfuric acid.The results show that resistance to chloride ion permeability of segment is reduced by using the acrylic copolymer emulsion(BR)and epoxy resin(HY),the Cl~-diffusion coefficient of segment repaired by BR and HY is increased by 20%and 8.7%compared with that of the original matrix,but resistance to chloride ion permeability of segment is increased by using the polyurethane(JZ)or new repair material(XC),the Cl~-diffusion coefficient of segment repaired by JZ and XC is reduced by 11.9% and 10.1% compared with that of the original matrix.The ability of anti-sulfuric acid etchin is decreased after repaired by different materials.The compressive strength of segment repaired by HY by sulfate attack is 95.7% of the non-erosive specimen,which has the lowest decrease rate.The flexural strength of segment repaired by JZ by sulfate attack is 75.6% of the non-erosive specimen,and the decrease is the smallest.更多还原