| Summary: | The concrete structure is the main component to support the structure of the building, but when concrete has been used for an extended period hence, it needs to be evaluated to determine the current performance of the concrete structure. The poor quality of concrete structures will cause discomfort to the user and the safety will be affected due to lack of concrete strength. If these issues are not monitored or not precisely known performance, and no further action done then, the concrete structure will fail and eventually it will collapse. Five units of terrace houses that are built less than 10 years old with extension or renovations and have cracks appear have been selected for this study. The instrument used in this research is Ultrasonic Pulse Velocity (UPV), with the objective to determine the current strength, investigate the pulse velocity of the concrete and to determine the depth of crack line. The data showed that the average velocity of the pulse is less than 3.0 km/s and has shown that the quality of the concrete in the houses are too weak scale / doubt in the strength of concrete. It also indicates that these houses need to have an immediate repair to remain secure other concrete structures. © School of Engineering, Taylor’s University.
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