BS EN 12697-39-2020 Bituminous mixtures – Test methods Part 39: Binder content by ignition.
5.1.1 Furnace, capable of burning all the binder with the features detailed in 5.1.2 to 5.1.6 for
Method A and 5.1.2 to 5.1.4 for Method B.
NOTE The temperature required to burn all the binder will depend on the technology used and is determined as part of the calibration procedure (see Annex A).
The furnace should not operate at its maximum capacity in order to allow flexibility and to ensure long service.
5.1.2 Sample chamber, having an internal capacity capable of taking the sample without touching the sides and with the maximum dimensions not greater than twice the minimum dimensions.
NOTE Larger chamber sizes can expedite testing by allowing larger sample basket(s) (and thus the material to be tested can he placed in thinner layers).
5.1.3 Automatic lock, that shall not allow the door to be opened until the completion of the test procedure, and a warning system to indicate the end of the pre-programmed temperature cycle.
5.1.4 System for reducing furnace emissions, by which the furnace shall be vented into a hood or to the outside and which, when properly set up. shall permit no noticeable odours escaping into the laboratory.
The furnace shall have a fan with the capability to pull sufficient air through the furnace to expedite the test and to reduce the escape of smoke into the laboratory.
NOTE The method for reducing furnace emissions can comprise a filter and a post combustion chamber that is designed to eliminate the toxic residues produced by burning the binder.
If mechanical ventilation is used, the air flow should be adjusted so as not to affect the operation of the equipment (e.g. a forced air extraction system may result in a loss of fines and the generation of fumes from the furnace).
5.1.5 Internal balance, capable of detecting mass variations of ± 0.1 g in the sample within the baskets.
The balance shall be thermally isolated from the furnace chamber.
5.1.6 Data collection system and a warning system, which shall be capable of being set to a value such that the loss in mass between individual readings taken at 1 mm intervals for three consecutive minutes at end of the pre-programmed temperature cycle is not higher than the values stated in Table 1.
5.2 Metal baskets, manufactured from perforated sheet of tempered stainless steel or other suitable material that permits adequate air flow through the sample and retains the majority of the sample throughout the test.
The dimensions shall be specified by the furnace manufacturer to provide the maximum surface area for the sample while still providing sufficient room to safely load and unload the sample. The baskets shall be capable of being nested.
5.3 Catch pan, made of stainless steel with dimensions sized to accommodate the metal baskets specified in 5.2.BS EN 12697-39 pdf download.