Concrete Compressive Strength Testing
The Testing Process
Concrete is used across the majority of building elements and is required to support loading. There are various test methods to confirm it’s capable of withstanding its specified load. The most common and accurate form of testing would be concrete compressive strength testing.
How Concrete Compressive Strength Testing Works
One method is taking cube samples during the pouring process. The cubes are generally tested at 7 and 28 days unless specific, for example to remove a concrete shutter safely prior to 7 days. Usually 1 cube will be tested at 7 days and 2 cubes at 28 days, however this can vary depending on the requirements, check the design first. The cubes are removed from the curing tank, dried and grit removed. The cubes are tested using a calibrated compression machine. This can be carried out internally by competent personnel or by a certified test house with UKAS accreditation.
To confirm an existing structure is still capable of its required loading, concrete core samples can be removed via hydrostatic diamond drilling techniques. The cores taken need to be of a 1:1 size ratio. For example, 100mm diameter and 100mm long. Any reinforcement present in the concrete is to be avoided so as not to affect the test result. A cover meter survey could be required to ensure this.
