Why is it a problem to add rap at the hot end of a drum mixer where the aggregates are drying?

The important factors contributing to the problem of emission are high moisture content of the aggregates, higher amount of fines in the RAP material and a relatively long time of exposure of the asphalt binder to the steam in the gas stream.

What materials make up asphalt?

The two main ingredients mixed together to make asphalt pavement are asphalt cement and aggregate. Asphalt cement is a highly viscous liquid form of petroleum. It acts as the glue that binds the aggregate (small rocks) together to create a tough and flexible material.

What are the components of hot mix asphalt?

Hot Mix Asphalt (HMA) is a combination of approximately 95% stone, sand, or gravel bound together by asphalt cement, a product of crude oil. Asphalt cement is heated aggregate, combined, and mixed with the aggregate at an HMA facility.

What fuel is used for asphalt plant?

Many asphalt plants automatically turn to diesel or oil, without realizing that propane, with its comparable heat intensity and overall performance, could be a better choice.

What is blue smoke asphalt?

Blue smoke is the haze commonly associated with the production of asphalt products. Blue Smoke Control Division applies it’s patented technology to remove over 95% of the blue smoke emissions at this plant.

What is emulsion in asphalt?

Asphalt emulsions are usually the oil-in-water-type emulsion that breaks on application to a stone or earth surface, so that the oil clings to the stone and the water disappears.

What is sheet asphalt?

Sheet Asphalt: A hot mixture of asphalt binder with clean, angular, graded sand and mineral filler. Its use is ordinarily confined to reservoir liners and landfill caps; usually laid on an intermediate or leveling course.

What is the difference between hot mix asphalt and cold mix asphalt?

Strength – Hot mix asphalt is the most durable grade of paving asphalt, which is why it’s used for high traffic roads and highways. Cold mix asphalt isn’t strong enough for regular vehicle traffic. Bend but Not Break – Asphalt is more flexible than it’s paving counterpart concrete.

What is hot mix made of?

Asphalt is a mixture of aggregate (gravel and sand) and bitumen binder, and when mixed together at a high temperature it forms hot mix asphalt. This is the type of asphalt that we choose to use on all our asphalt projects including car parks, hardstands and large driveways.

What are the four main types of asphalt?

There are five different types of asphalt pavement that you might be driving over.

• Porous Asphalt. Porous asphalt has been around since the mid 1970s.
• Perpetual Pavement. Perpetual pavement is a combination of asphalt and the multi-layer paving design process.
• Quiet Pavement.
• Warm-Mix Asphalt.
• Thin Overlays.

What are the ingredients of asphalt emulsions?

Asphalt emulsion is a combination of three basic ingredients, asphalt, water, and small amount of an emulsifying agent. In the same process, these components are introduced into a mechanism known as a colloid mill, which shears the asphalt into tiny droplets.

What is an asphalt dryer drum?

Asphalt Dryer Drum Asphalt dryer drum is one of the most important component of asphalt plant drying and heating system. The main purpose is to remove the moisture from the cold aggregate and heat them, which can ensure bonding with the asphalt. As we all know, the moisture of cold aggregate should be controlled accurately.

What is the structure of the asphalt drum mixer?

The structure of the asphalt drum mixer for drum mix plant is composed of a cylinder body, a feeding blade, a rolling ring, a supporting roller assembly, a thrust roller assembly, a driving device, an inlet and outlet cigarette box and a frame.

What is the best material to build a drinking water reservoir?

Asphalt is a natural non-toxic material, so it is ideal for drinking water reservoirs and is non-harmful to the environment. Construction times are shorter compared with those with clay or moraine cores, reducing cost and enabling the reservoir to be flooded at the earliest opportunity.