We often hear about how environment-friendly asphalt is as a material for Lakeland parking lot paving and roads and driveways, but we can never understand it thoroughly until we discuss the reclaimed asphalt pavement or RAP.
Asphalt is the primary choice of pavement projects because of one main reason: it is recyclable. Unlike concrete, asphalt can be recycled and used again for constructing pavement.
The term RAP is given to removed or reprocessed pavement materials containing asphalt and aggregates. These materials come from asphalt pavements that have been removed, reconstructed, resurfaced, etc. When it is properly crushed and screened, RAP can be used for high-quality road construction since it contains well-graded aggregates coated by asphalt cement.
How is asphalt removed?
Asphalt can be removed by the use of a milling machine, which can break up to 2 inches of the thickness of an asphalt pavement in one pass. This is probably the easiest way to remove an asphalt pavement, though the base should still be removed either by a heavy equipment or manually, in some cases.
A full trimming, on the other hand, requires the use of a rhino horn on a bulldozer or a pneumatic pavement breaker.
After such time that the asphalt pavement has been broken up into pieces, they will be loaded on a truck and brought to a facility for assessment and screening. After the assessment, the broken asphalt will be go through a series of operations, including crushing, screening, conveying and stacking.
The majority of broken down asphalt are processed in a central facility, but there are instances where it can be pulverized right on the site using a self-propelled pulverizing machine. This makes it easy for both camps to finish the project, especially if the broken down asphalt will be reused to strengthen the base soil.
Different methods of recycling have brought various processes, too. Continuous train operations is now a trend, which consists of partial depth removal of the pavement surface, mixing the reclaimed materials with other additives such as virgin aggregate, binding, and rejuvenating agents, and placing and compacting this mix in a single pass.
There is no readily available figures for the production of RAP in the United States, though it is believed that around 41 million metric tons are manufactured in the US annually.
The RAP is one of the main reasons why asphalt is the choice of most paving companies and businesses when there is a need for an asphalt road, parking lot, or driveway.