Year: 2025
Type: conference-paper
Abstract: . The effectiveness of repair work relies on whether the interface substrate can achieve sufficient bond strength when subjected to numerous stresses. This study investigated the bond properties of repaired normal concrete (NC-to-NC) elements, including cube, beam, and U-shaped specimens, after undergoing natural fracture due to flexural and tensile stresses. The specimens were repaired using a polyurethane (PU) matrix by gluing the two parts and tested for compression, splitting, and impact tests to evaluate the bond strength properties. The result revealed that the PU matrix effectively repairs NC substrate with adequate bond strength, which exceeds the minimum allowable bond strength specified by the ASTM ACI 546-06 for rehabilitation of impaired concrete structure. The reference beams exhibit the highest ultimate load capacity of 15.6kN with lower deflection than the repaired specimens. The mean number of blows at the cracking stages appeared nearly equal for both reference and repaired NC-to-NC specimens. The reference specimens exhibit an average number of 24 blows and 31 blows at the first and failure stages, respectively, which are higher than that of NC-to-NC repaired specimens by 9.1% and 5.2%. Indicating the effectiveness of the PU matrix in bonding the two pieces together with high strength under repeated impact loads.
Source: Materials research proceedings
Author: Sadi Ibrahim HARUNA
Institution: Prince Sultan University
Language: English
Subfield: Building and Construction
Field: Engineering
Domain: Physical Sciences
Open Access status: hybrid
Award: G4502049233
OpenAlex ID: W4407423693