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Astec offer both long-term and short-term storage options.
Use Astec asphalt silos as a conventional surge bin during the busy time of
day, and at day’s, end avoid time-consuming start/stop operations and
begin filling silos while continuing loadout. The next work-day, begin
selling mix right away from full silos. Nobody has to wait for mix.
Uninterrupted production runs allow you to maximize equipment efficiency
and reduce material waste. Incorporate multiple silos in your plant
layout and you will be ready to meet customer needs for a number of
different mixes. That’s how Astec storage silos reduce operating costs
and improve plant operating efficiency.
Astec hot mix storage systems come complete with drag
conveyors, traverse conveyors and batchers. Bucket elevators are
available. Silo support structures are designed to meet the site
specific design criteria at your location based on the current building
codes in your area. Our structural engineering staff will design your
foundations based on soil conditions at your site.
Astec Long Term Asphalt Storage Silos
Applications
Asphalt Mixing
A thermal mixing process is required to turn aggregates and liquid AC into an asphalt pavement mix for road construction. This makes an asphalt mixing plant necessary for road construction. The complete line of Astec asphalt mixing plants, and its range of capacities and features, gives you the choices and flexibility to create your optimum solution.
After asphalt paving mix has been produced it is transported to a silo or silos to be batched into waiting trucks or stored for sale at a later time. Silo storage brings the economies of long production runs to the asphalt mixing industry. Both long-term and short-term storage options are available depending on requirements at your plant.
Steep Angle Cone
Astec silo cones are taller, because they are built with a steeper angle than other brands. To achieve optimal mass material flow, Astec, with the aide of third party research, determined that the precise angle at which the entire column of mix evenly flows through the cone is 66 degrees. This steeper angle of the cone provides true first-in/first-out inventory rotation, there is no mix buildup on silo walls, and mass flow loadout minimizes mix segregation. Mass flow occurs when mix flows out across the entire silo cross-section and that only happens with the correct cone angle.
Cone Liners
Astec designs silo cones to protect critical areas. Mix can be abrasive and can wear on the area where the cylinder and silo cone meet. Astec lines this area with abrasion-resistant steel liners. Optional ceramic liners are available.
Air-Tight Seal
The design of Astec’s discharge gate completely seals the bottom of the cone when the silo is in storage mode. The heated and insulated discharge gate closes to completely cover the cone opening. Oil is pumped into the gate to seal the bottom silo opening. The oil reservoir is located by the silo legs, and a motor-driven pump moves the oil from the reservoir into the gate. A sensor monitors the oil level in the gate and controls the pump. When the silo is taken out of storage mode, the pump is reversed and the oil is automatically withdrawn from the gate.
Thick Insulation
Two layers of stiff sheet insulation are staggered to eliminate heat-leaking seams along the silo cylinder. Astec uses thick, full R-value non-compressed insulation.
Roller Chains
The drag conveyor reaches from the mixer exit chute to the top of the silo. Strong, wear-resistant, 6-inch roller chain runs from bottom to top, with 3/4-inch thick, 7-inch deep, steel slats attached every 12 inches. This heavy slat chain assembly resists hydroplaning over the mix. Depending upon required capacity, Astec offers either single or dual chain configurations.
Segmented Sprockets
The drag chain rides on segmented sprockets located at the head and tail shafts. Case hardening gives the sprockets a uniform, hardened wear surface for a long-life while maintaining ductility for severe service. Each sprocket bolts to a split hub. You can replace the sprocket one piece at a time without removing the chain, which drastically reduces the time and effort required. The tall shaft is adjustable so the drag chain can be tightened at ground level.
Insulated Silo Top
Twelve inches of thick insulation at silo tops helps keep mix hot during storage periods.
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