DOUBLE BARREL GREEN SYSTEM AN EQUIPMENT MEANS TO PRODUCE WARM MIX By Malcolm Swanson, P.E. Vice President – Engineering Astec, Inc. SUSTAINABILITY. Conserving our resources Reducing energy consumption Reducing Greenhouse Emissions Being more environmentally friendly
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DOUBLE BARREL GREEN SYSTEM
AN EQUIPMENT MEANS
TO PRODUCE WARM MIX
Malcolm Swanson, P.E.
Vice President – Engineering
Double Barrel Green
The ASTEC Double Barrel Green System
Is An Equipment Package That Enables
The Making Of Warm Mix By Adding
Only Water to the Liquid Asphalt.
Improved Comfort and Safety of Workers
No Smoke At Paver
No Extreme Temperatures
Extends Resources by Recycling More
Uses Less fuel
Increases Plant Production Capacity
ASTEC Double Barrel Green System
DOUBLE BARREL GREEN
WATER IS INJECTED INTO THE AC INSIDE THE FOAM NOZZLE.
Steam Bubbles Produce Foamed AC.
FOAM EXPANDS THE LIQUID ASPHALT
AND INCREASES FILM THICKNESS
THE SYSTEM CONSISTS
WATER TANK AND
FOAM UNIT MOUNTED
ON DOUBLE BARREL ….
Water Solenoid Valve
Hot Oil Out
Hot Oil In
AC Valve (one of nine)
How Much Water?
2% of liquid AC by weight
2 LBS. of Water for 1 Ton of Mix
National Center for Asphalt Technology
Contact : [email protected]
1.Coating and mixing of the warm mixes were equivalent to that expected for conventional hot mixes.
2.Workability of the warm mix at 250 F (121 C) to 270 F (132 C) was similar to that of hot mix at temperatures above 300 F (150 C).
3. There was no smoke.
4. There was evidence that the warm mix was susceptible to stripping. This has been a characteristic of warm mix in general. One reason could be that the binder is not aged during mixing. Potential solutions include using a harder AC or an anti-strip agent.