The gyratory compactor has been used for concrete materials in Finland and Scandinavia. The method is used for mix design and quality control mainly in concrete product plants, where low workable and zero slump concrete is used (for such products as hollow-core slabs, tubes and paving blocks). The method is used for: • Mix design simulating selected production processes • Specimen preparation for strength tests (fresh and cured) • Research of mix related phenomena (workability, curing time, admixtures, etc.)