KPI 9 Screen

Astec Asphalt


Warm Mix Systems for Continuous Mix and Batch Plants

The benefits of warm mix asphalt such as reduced energy consumption, lowered emissions, and elimination of visible smoke are well-known in the asphalt paving industry. Warm mix technology allows mix to be prepared and placed at lower temperatures, typically 50°F to 100°F lower than conventional hot mix. To achieve this, the viscosity of the asphalt cement (AC) must remain low at the reduced temperatures. Maintaining a low viscosity at lower temperatures allows mix to flow freely through storage, transfer and placement equipment and is more easily worked by hand.

Unfortunately, many technologies for warm mix production rely on additives, special asphalt cement, special procedures and/or special AC delivery systems to achieve low viscosities at low temperatures. The additives are expensive and add significant cost per ton of mix. Astec warm mix systems eliminate the need for expensive additives and special asphalt cement by mixing a small amount of water into the AC to create microscopic bubbles. These small bubbles act to reduce the viscosity of the AC coating on the rock allowing the mix to be handled and worked at lower temperatures.

Water is delivered to the system using a positive displacement piston pump capable of accurately metering water into the system. Using feedback controls, pump speed is modulated to maintain the appropriate flow of water based upon the flow of AC. PLC controls provide for smooth and consistent water flow as production rates increase or decrease.

Water is injected into the liquid AC through a series of all stainless steel injectors located above corresponding foaming chambers. AC flows through the foaming chambers where water and AC are thoroughly mixed to produce mechanically foamed AC.

A skid-mounted corrosion-free water reservoir is provided with an automatic filling valve. If supply water is lost, a low-water alarm alerts plant personnel so the problem may be resolved quickly without wasting mix.



Share this article





Related Posts


Counterbalance Reach truck
Counterbalance Reach truck
Crown High Reach
Crown High Reach
Reach truck Controls
Reach truck Controls

Latest Posts
Cedar Rapids Crushers
Cedar Rapids…
Based on the classic ElJay design, the…
Used Meyers Snow Plow parts
Used Meyers Snow…
Users input a ZIP code and then use drop-down…
Crusher Rock
Crusher Rock
We now carry the New and Improved model…
Crane Truck Games
Crane Truck Games
Push the gas pedal and race in a city…
Rubber tyred Roller
Rubber tyred…
HAMM offers a wide range of products…
Search
Featured posts
  • Counterbalance Reach truck
  • Crown High Reach
  • Reach truck Controls
  • Reach Forklifts
  • Raymond Reach Trucks Controls
  • Reach truck license
  • How to operate a Reach Truck?
  • Reach truck Singapore
  • High Reach Trucks
Copyright © 2024 l www.mtnvalleyequip.com. All rights reserved.