The best asphalt paving materials depend on the type of construction for you to use the materials and their ability to reach the level necessary to produce the high-quality asphalt pavement density. According asphalt paving Iowa Association (ApaI), “asphalt concrete paving material is most widely used in the United States. For versatility, durability and ease of construction, there is no match.”
Hot mix asphalt (HMA)
Hot mix asphalt (HMA) is a mixture of traditional asphalt concrete used for construction of roads and highways in the United States. Cement (folder) of asphalt and mineral aggregates is the main materials in HMA. HMA may contain additives, claims parchment asphalt (RAP) and recycled asphalt shingles. HMA is called “hot mix” because it requires temperatures of 149 degrees Celsius or more effectively link the asphalt cement to mineral aggregates.
Basic Materials HMA
Asphalt cement derived from petroleum processing and also in the form of natural deposits (rock asphalt). The design guidelines APAI describe asphalt cement as glue is waterproof, durable and resistant to most acids, alkalis and salts. Mineral aggregates include sand, gravel, crushed rock, boulders, rock dust and slag. They are clean, screened, crushed and processed to meet the specifications of graduation before being mixed with asphalt cement.
Best asphalt pavement materials
In a report published in March 2010, researchers at the Utah Department of Transportation tested two anti-stripping additives: lime powder and Gilsonite. The additives are mixed in two separate applications of HMA and for a period of four years showed a similar reduction in the amount of damage to the flooring. Chemical additives allow asphalt concrete to be processed at temperatures below 149 degrees Celsius. This combination is called hot mix asphalt (WMA).
Hot mix asphalt (WMA)
Technologies like MEZ-Min and WMA-foam developed in Europe, and Evotherm and Advera WMA in the United States use a variety of techniques and materials of the mixture to produce WMA mixtures. The Department of Transportation, Federal Highway Administration, indicates research report and further research is needed to confirm the environmental benefits and costs associated with the production and placement of WMA mixtures.
Reclaimed asphalt pavement (RAP) is extracted from recycled concrete and asphalt roads. The pavement is taken to a processing plant where it is crushed and screened for reuse in HMA and WMA. RAP can be used as an aggregate substitute material or asphalt cement supplement. Asphalt shingles are also recycled for use in asphalt mixes. The tiles are sent to a processing plant, where they are crushed and screened for reuse.