Performance Evaluation and Crack Repair in Building Infrastructure

The implementation of building infrastructure development to improve people's lives is important. The use of reinforced concrete structures has increased very rapidly. But many buildings are failed and are not safe because of overloading, changes in function and configuration of buildings, poor maintenance, and natural disasters. Many methods developed to reduce the damage caused by earthquakes so that the development of methods to strengthen and repair building structures is needed to anticipate damage to buildings. This study focuses on beam-column joint cracks with simple building characteristics, column size 20/20 and beam 15/20 (monolithic) with concrete quality fc'= 21 MPa, so it is necessary to evaluate and repair beam-column joint cracks in buildings because of overload. The method used was experimental and testing in a laboratory with a single static load and Ultrasonic Pulse Velocity (UPV) test to determine the density after repair. Test specimens are SK (control-specimens) and SK-repairing. The results showed that the beam-column joint performance before and after repairs had relatively the same flexural strength of 1,669 kg and 1,686 kg, while the stiffness was lower at 14.48%. The velocity after repair average is 3,327.5 m/s (medium-category). The elasticity average modulus of the test is 20.43 GPa.