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rap recycled hot asphalt batching pavement
Sales rap recycled asphalt pavement
According to the latest industry survey, the National Asphalt pavement Association (NAPA) conducted a collection and reuse of more than 100m tons of recycled asphalt pavement (RAP) in the United States during 2018 with the Federal Expressway Administration. Save about 61.4 million cubic yards of landfill space. The survey, conducted by NAPA during each construction season since 2009, has consistently found that nearly 100 per cent of RAP has been used for useful uses, mainly new asphalt pavements.
"over the years, we have seen the steady development of rap music throughout the country. This is the result of the joint efforts of industry and road owners who study and apply best practices to ensure that we maintain or improve performance while increasing the use of recycled materials, "said Audrey Copland, president and CEO of the Napa Association. "with the growing interest in the application of other recycled materials to pavement, we must continue to understand the impact of new materials on pavement performance before they can be widely used."
Nationwide, the average RAP level of new asphalt pavements in 2018 was 21.1%, the highest level since the survey began in 2009.The survey found that in 2018, 82.2 million tons of RAP and 1.05 million tons of recycled asphalt tile (RAS) were used in 389.3 million tons of new asphalt mixtures in the United States.
Another 8.8 million tons of RAP and RAS are used as aggregates for cold mix asphalt and other road construction activities. The survey also found that by the end of 2018, the country had stockpiled about 111.7 million tons of RAP and RAS, for future use.
Although national usage was not taken into account, those surveyed reported the recovery of approximately 1.8 million tons of recovered tyre rubber, steel and blast furnace slag; cellulose fiber; In 2018, about 12.3 million tons of asphalt pavement mixtures were made of other recycled and waste materials.
In the 2018 construction season, more than 85 million tons of recycled materials-mainly RAP and ras-- were used in new asphalt pavement mixtures, an increase of 7.6 per cent over 2017. Using RAP and RAS alone saves more than $2.9 billion more than using raw materials.
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Audrey Copland (Audrey Copeland), president and chief executive of NAPA, said: "over the years, we have seen a steady increase in the use of rap music across the country." "this is the result of the concerted efforts of the industry and road owners to study and apply best practices to ensure that we maintain or improve our performance while increasing the use of recycled materials."
Copland added: "with the growing interest in the application of other recyclable materials to pavement, we must continue to understand in depth the impact of new materials on pavement performance before they can be widely used."
Nationwide, the average number of new asphalt pavements built in 2018 was 21.1 per cent. This is the highest level since the Napa survey began in 2009.
The survey also found that the United States added 389.3 million tons of asphalt mixture in 2018, using 82.2 million tons of RAP and 1.05 million tons of recycled asphalt tiles.
Another 8.8 million tons of RAP and RAS are used as aggregates for cold mix asphalt and other road construction activities. In addition, the survey also found that by the end of last year, the United States had stockpiled about 111.7 million tons of RAP and RAS, for future use.
The asphalt pavement industry also continues to use warm mix asphalt (WMA) technology.
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In 2018, WMA technology was used to produce 157.4 million tons of asphalt pavement mixture. More than half of that tonnage is produced at low temperatures, which means less energy is needed in the manufacturing process, according to NAPA.
The most commonly used WMA technology is plant-based foaming, which injects a small amount of water into the asphalt during the production process. Napa says many environmental, worker safety and building benefits have been achieved through the use of WMA technology.
"Ten years ago, WMA technology was a novel idea," said John Harper (John Harper), Construction Partners Inc.. Senior vice president and chairman of Napa in 2019. In 2018, however, more than half of the tons of asphalt mixture produced in 23 states used WMA technology, with six states accounting for more than 75 per cent.
Harper added: "while there is still room for growth in the application of WMA technology, it has become another tool that we can use to produce the best asphalt mixture to meet the needs of a particular project or organization."
