ISO 1920-7:2004 PDF Download

ISO 1920-7:2004 is a standard that focuses on non-destructive testing methods used on hardened concrete. The standard outlines three specific methods for conducting these tests.

The first method described in the standard is the determination of rebound number. This method involves using a rebound hammer to measure the rebound of a spring-loaded hammer when it impacts the concrete surface. The rebound number obtained provides an indication of the surface hardness and, consequently, the strength of the concrete.

The second method outlined in the standard is the determination of ultrasonic pulse velocity. This method uses ultrasonic waves to determine the velocity of the waves as they travel through the concrete. By measuring the time it takes for the waves to travel through the concrete, specific properties such as density, homogeneity, and integrity can be evaluated.

The third method described is the determination of pull-out force. This method involves attaching a device to the hardened concrete and applying a force to measure the resistance of the concrete to being pulled out. This test provides valuable data on the bond strength and cohesion of the concrete.