However, it has a greater influence on the interfacial delamination length and maximum delamination height of the repaired beam. When the interface roughness is different, the crack width of the SHCC repair layer is similar. Interfacial bonding property is the main factor that affects the shrinkage and deformation coordination of SHCC-repaired beams. The results show that under the shrinkage stress, multiple fine cracks instead of local fractures occur in the SHCC repair layer, and the interfacial delamination is effectively controlled. To reduce cracking, Strain Hardening Cement-based Composite (SHCC), with strain hardening and multiple cracking property, is prepared to study the influence of interface roughness and repair layer thickness on the shrinkage, cracking and delamination modes of SHCC-repaired concrete beams. Thus, a second repair is required in a short period, increasing the maintenance cost. The failure of more than half of repaired concrete structure is due to the re-cracking of the repair material itself or delamination and peeling from the concrete matrix. Traditional cement-based repair materials are brittle and prone to cracking.
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