Crack Repair Technology and Durability of Concrete Bridge Based on Composite Toughening
Concrete bridges are affected by corrosive elements such as chloride and salt during service,and cracks of different widths and sizes will appear,which will seriously affect the durability of structures.In order to improve the service performance of concrete bridges,a composite toughening method was proposed to repair the active cracks of concrete bridges with a width greater than 0.5 mm.Based on the proposed repair technology,the classical RCM method was used to study the durability of concrete specimens repaired with different materials,and the chloride ion permeability resistance of structures repaired with different materials was measured.The results show that,compared with the concrete specimens repaired by ordinary mortar and high-strength mortar,the chloride ion perme-ability coefficient of the repaired structure repaired by epoxy resin is only0.11×10-12 m2/s,and the durability is better.
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