Asphalt Machines

Asphalt machines or asphalt pavers are heavy machines meant to do works such as laying out asphalt on driveways, motorways, parking areas and other such region out of doors.  The asphalt mixture that is spread out on these surfaces has a crude oil as its base with gravel and other such substrates as the aggregate. There are two major varieties of asphalt machines for paving works – the tractor or dump truck and the compact asphalt pavers. The compact units are generally used to work in small spaces like parking lots for they are easy to maneuver in case of space shortage. However, its power being very low (only about two to three horsepower), it cannot work in large areas. This is where the tractor variety of asphalt machines steps in. With capacities ranging from 100 to 250 horse powers, they are the best option for large projects.

Components

An asphalt machine meant for paving works is made completely of steel. The body of the machine is fashioned out of heavy gauge plates of steel. In case of the dump truck variety of asphalt machines, the dump truck is made out of hard cast steel that is fused with nickel.

 

Designs of asphalt machines

Manufacturers generally offer a wide variety of options when it comes to size and designs of these machines so as to suit the needs of every possible customer. The large tractor varieties in general are 19 to 23 feet in length, 10 to 12 feet in width and have a height of approximately 11 feet. Depending on the size of the engine and the amount of materials that can be carried by the dump truck in tow, their weights range from 20,000 to more than 40,000 pounds. Also depending on the surface area of the wheels, they can normally pave 8 to 12 feet at one go and the range reaches a maximum of 40 feet in the best models. A single pass over a particular area results in laying out of asphalt that is at least 6 inches to a foot in thickness.

The working mechanism

Before the job actually gets done, a dump truck fills up the towed container with asphalt. The tractor pushes the container forward while feeder channels inside the container push the asphalt in it backwards so as to cause the asphalt to spread out as the machine itself moves forward. There are distribution channels that spread the asphalt out in all directions up to a specified distance. Each such channel spreads the asphalt on the side nearest to it. The wheels get heated due to the friction with the surface of the road and this heat in turn helps to spread out the asphalt uniformly in all directions. The last section of asphalt machines, the roller, follows the wheels and adds a finishing touch to the entire process of layering the surface with asphalt. It is to be noted that without the accurate required temperature, the asphalt can never be laid out perfectly.