Abstract
Research on the application of ultraductile engineered cementitious composite (ECC) as overlay in the repair of deteriorated concrete structures is performed in this paper. Also, interfacial crack kinking and trapping mechanism experimentally observed in ECC/concrete overlay repair system are described by comparison of toughness and energy release rate. The mechanism involves cycles of extension, kinking, and arrest of interfacial crack into the overlay. Experimental testing of overlay repair system reveals significant improvements in load carrying capacity and ductility over conventional concrete overlay. The commonly observed overlay system failure mode of delamination or spalling is eliminated when ECC is applied. These failure modes are suppressed when ECC is used as an ideal and durable candidate overlay repair material.
Highlights
A large number of existing concrete structures worldwide, including previously repaired ones, suffer from deterioration or distress under combined mechanical and environmental loading conditions
By utilization of analytical solutions and experiments, the present research investigates the performance of engineered cementitious composite (ECC) as a repair material to improve durability of concrete structures
The stress intensity factors KI and KII for the kinked crack and K1 and K2 for the interfacial crack are dependent on the kinking angle ω and material moduli
Summary
A large number of existing concrete structures worldwide, including previously repaired ones, suffer from deterioration or distress under combined mechanical and environmental loading conditions. The stress intensity factors KI and KII for the kinked crack and K1 and K2 for the interfacial crack are dependent on the kinking angle ω and material moduli. The stress field prior to kinking (a → 0) is the singularity field of an interface crack characterized by a complex stress intensity factor:. The stress field on the straight line (x1 > 0, x2 = 0) ahead of the kinked crack tip is characterized by combination of the standard mode I and mode II stress intensity factors KI and KII: σ22 + iσ12 = (KI + iKII) (2πr)−1/2,. The relationship between the energy release rate Gi of the interfacial crack and complex interface stress intensity factor K = K1 + iK2 is
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