【摘要】 通过2组室内快速渗透试验,验证了混凝土表面黏贴碳纤维复合材料(CFRP)能够有效地阻止Cl-向混凝土中渗透:第1组试验验证了CFRP材料对Cl-阻隔的有效性;第2组试验则进一步验证了在混凝土表面黏贴CFRP对Cl-阻隔的作用。试验结果表明,对于海工混凝土结构,表面黏贴CFRP除了具有加固的作用以外,还具有阻隔Cl-的作用,进而可以延长加固结构的腐蚀诱导期。因此,当进行沿海混凝土结构CFRP加固设计时,建议考虑将CFRP和其他表面防护措施共同使用,并组成完整的表面防护体系。考虑到表面黏贴CFRP对Cl-的隔离作用是在一定时间内有效的,基于Fick第二定律,给出了海工混凝土结构外包CFRP加固后的寿命预测方程,为沿海混凝土结构CFRP加固设计及加固后耐久性评估提供了依据。更多还原

【Abstract】 The function that carbon fiber reinforced polymer(CFRP)bonded externally prevents effectively chloride ions from entering concrete was confirmed by two groups of laboratory accelerated penetration tests.The effectiveness of CFRP material to prevent chloride ions was confirmed by tests of type 1;and similar conclusion was also drawn in the test of type 2 when CFRP externally bonded on concrete specimens.Test results show that,for coastal concrete structures,there is not only function of strengthening of CFRP,but also that of preventing chloride ions from penetrating into concrete,and consequently to prolong the initiation period of rebars corrosion.It is also confirmed by test that there is similar function of CFRP and coating on the surface of concrete to shield concrete against chloride ions.Therefore,it is suggested that CFRP bonded externally and coating or other surface prevention measures are applied jointly to form an integrated surface prevention system when CFRP is applied in strengthening coastal concrete structures.Considering the limitation involving with time of the effective shielding function of CFRP,an equation used for residual lifetime prediction of concrete structures bonded externally with CFRP is derived from Fick’s dispersion law.Overall,the conclusion may be used for reference when CFRP is applied to strengthen coastal concrete structures.更多还原