In the construction site, various crack repair methods were used on concrete structures. Especially, the epoxy injection method was used on the economics, however various problems such as difficulty of material injection under the high pressure conditions, lacks of material injection under the low pressure conditions, and materials separation under the high pressure conditions were occurred. Therefore, there were conducted Mock-up Test and actual application using T-Port at on-site, and investigated the effect of injection on the concrete structure. Moreover, the ultrasonic test was also conducted in order to evaluate before and after repair effects. From there results, it was founded that T-port had a good performance for the crack injection compared to traditional method.

Keywords: T-Port, Injection method, Crack, Repair, Ultrasonic, concrete