The GOST R 58406 series of standards moves asphalt mix design from the Marshall methodology to a volumetric approach. For the laboratory this is more than replacing a single instrument: the specimen compaction method, the set of controlled parameters and the mix design logic all change.
The key investment is a gyratory compactor. Unlike the Marshall impact compactor, it forms the specimen by shearing action under constant pressure, which is closer to real roller compaction. When selecting a gyratory compactor, verify that the angle of gyration and pressure comply with GOST R 58406.10, and that specimen density is recorded during compaction.
The second group of expenses concerns volumetric properties. You will need a unit for determining the maximum density of the mixture (a vacuum pycnometer), a balance with a hydrostatic weighing attachment and a temperature-controlled water bath. The decision on mix suitability is now made based on the air void content at a specified number of gyrations.
Part of the existing fleet is retained: drying ovens, mixers, binder extraction equipment and sieve shakers continue to operate under the previous methods. Wheel tracking machines become mandatory for surface course mixtures — if the laboratory does not have one, it should be included in the first-priority procurement plan.
Practical advice: plan the transition for the off-season and allow one to two months for parallel testing under both the old and new methods — this lets staff master the equipment and accumulate statistics before the construction season begins. In-Test supplies the complete set of equipment for GOST R 58406 and provides training at the customer's site.