When the experiment according to AASHTO T trial 182 "Coating and Stripping of Bitumen-Aggregate Mixtures" under the surface of the mass of coarse there must be a full-coated surface of asphalt aggregates.
When the trial was under way AASHTO T 182 "Coating and Stripping of Bitumen - Aggregate Mixtures" rough surface of the mass must have a full tarmac surface coating of aggregates.
When the experiment according to experiment AASHTO T 182 "Coating and Stripping of Bitumen - Aggregate Mixtures." the skin of coarse asphalt coating surface must be full of aggregates