Abstract
The bonding surface structure generated by the repair of concrete structures has been paid more attention as a weak point. The effects of old concrete age, interface roughness, and freeze-thawing (F-T) attack on adhesive interface are comprehensively investigated. In this study, six kinds of interface roughness and five different old concrete age are designed. The interfacial bonding property is mainly evaluated by splitting tensile strength (fts). Fractal analysis was used to characterize the interface roughness using laser scanning data. In general, the fts increased with the increasing value of interface fractal dimension. The relationship between fts and fractal dimension value was further analyzed, considering the old concrete ages and the F-T cycles. The results show that the effect of roughness on the bonding property of new-to-old concrete is more significant than the age of old concrete, and the influence of the F-T cycles on the bonding surface is mainly reflected in the initial stage of the F-T deterioration process. The relative dynamic elasticity modulus decreased obviously under F-T cycles, especially for the specimens with low interface roughness. In combination with the results of two non-destructive methods (ultrasonic non-destructive test and relative dynamic elastic modulus test), the larger roughness and the smaller age of old concrete can improve the bond performance.
Highlights
Identification, evaluation, reinforcement and repair of aging concrete structures has become a popular industry [1]
The bonding interface is the weakest part in the repaired structure, and the bonding property is critical for the performance of repaired structure [3,4,7,8,9]
Under the same age of the old concrete, the wave velocity was closely related to the age of the roughness
Summary
Identification, evaluation, reinforcement and repair of aging concrete structures has become a popular industry [1]. With the increase of the application scope and field of concrete materials and the improvement of engineering quality requirements, the durability problems of concrete-to-concrete structures are gradually exposed [2,3]. The existing concrete structure is in urgent need of effectively repair for strengthening [5,6]. A bonding interface is formed between the repair material and the concrete substrate. Efficient and durable concrete repair can extend the service life of concrete structure and ensure the long-term durability [10,11,12]
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