Gilson Asphalt Content Furnace is a simple, manually operated furnace that fully meets ASTM and AASHTO standards for asphalt content determinations of hot-mix asphalt (HMA). Standard 1,200–1,800g samples are processed in just 30–45 minutes. Larger samples up to 3,000g require longer times. Process times are comparable to automatic-weighing units, and results equal or exceed the accuracy of automated systems.
An asphalt sample is heated until the binder portion ignites. The temperature in the main chamber rises substantially above the setpoint, peaks, then gradually returns to the setpoint as coke-type residual products are burned off. When determining the decoking period to program for a new mix, the sample is merely returned to the furnace for an additional 5–10 minute period until completion is confirmed by stable total weight.
As the asphalt ignites and burns, volatilized components of the binder are carried by the exhaust stream into the high-temperature afterburner chamber, where they are completely oxidized. Large amounts of room air are drawn in, quickly cooling the exhaust for safe discharge to the outside. Any remaining particulate matter is captured in the disposable in-line filter. The furnace remains locked during operation until a safe temperature is reached during the cooldown process.
The easy-to-operate controller features a large, bright display showing operating temperatures, times, setpoints, and menu functions. Up to ten timed programs with chamber and afterburner time and temperature setpoints can be stored. A preset function allows starting of the furnace at a specific time of day to eliminate warm-up wait time. The controller can also be used for custom programs with multiple ramps and dwells for glassware cleaning or other applications. The stainless steel case has a drop door to serve as a shelf for ease of sample tray handling. Heating elements are quality Kanthal A-1 and easily accessible for inexpensive replacement as needed.
The furnace is easily converted during installation to operate on a number of different single or three-phase electrical supplies, from 208 to 380V at 50 or 60Hz, with current draw ranging from 16 to 45 amps, and a NEMA 6-50 Cord Set is supplied.
- Simple, manually operated unit optimal for asphalt content determinations up to 3,000g
- Comparable to or more accurate than automated systems
- The locking feature keeps the unit closed until test completion
- Gilson Asphalt Content Furnace
- Two Sample Baskets
- Basket Cover
- Sample Tray
- Tray Handling Fork
- Two Ceramic Hearth Plates
- Exhaust Filter
- Filter Holder