The IC-tester compacts the mass sample (ca. 0.8 dm3) using a continuous, kneading action. Pressure and cyclic shearing is applied to the mass. At the end of the test an ICT-index is obtained which describes the amount of work needed to compact the sample to a specified density. The compaction takes place in a test cylinder with oscillating end plates in such a way that the concrete mass is subjected to cyclic shearing. The concrete cylinder which is obtained after the compaction may be subjected to compressive or splitting strength tests at different ages.
This method can be employed in quality control of concrete as well as in research and product development.