What is Asphalt?
Asphalt is a bituminous substance that consists of several ingredients. They are sand, some form of aggregate, and a petroleum-based product that binds everything together (AC 30). These elements are mixed together under extreme heat, 350-400 degrees, to create the substance known as asphalt.
There are many different types of asphalt mixes that are created for different purposes. These mixes are different because of the size of the stone that is used in creating the mix. The basic types of mixes are 404, 402, 301, and sand mix (the larger the number, the smaller the stone). 402 and 301 are used for base preparation for driveways and parking lots that get heavy traffic. 404 is used as the basic driveway mix by all area contractors.
The asphalt is laid down hot (300 degrees) and is rolled to get the maximum density of the material to create prolonged life. Compaction is a critical phase because it gives the asphalt extra strength which means extra life. As the asphalt cools, it solidifies and becomes hard. Although the asphalt looks hard, it is actually pliable for several weeks. It takes about ninety days for the asphalt to really cure.
The basic driveway that has never been paved before receives at least 2 1/2" of asphalt in depth. A toper (resurface of existing asphalt area) receives 1 1/2" with leveling course. The average driveway is 10 to 12 feet wide.
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