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Five years ago, recycled asphalt tile (RAS) found a place in the market.
In 2014, the paving industry used nearly 2 million tons of RAS to replenish mixtures and pave new roads, marking a strong and growing customer base of materials that are often sent to landfills.
However, with the decline of the price of asphalt cement, the use of RAS is spiraling. The road-laying industry has switched to cheaper raw materials, and the use of RAS on roads has more than halved by 2017.
Despite the dismal numbers, (ASR), an asphalt tile recycling system in Barrington, Rhode Island, was not affected. Since its inception in 2009, the company's main goal has been to work with the North American roof industry to improve the sustainability of its business by finding an end market for RAS. In the midst of a sudden economic downturn, the company has been vigilant in its efforts to achieve its goals.
Alan Clark (Alan Clarke), partner at ASR Systems, said:
Asphalt tiles are the main source of waste in the roof industry, with nearly 90 per cent of asphalt tiles in landfills across the country, according to ASR Systems.
Dan Horton (Dan Horton) left his executive position at roof maker IKO Industries in 2009 to build the ASR system, when he aimed to minimize that proportion.
Since then, the company's three plants-two in Tennessee and one in Connecticut-have processed more than 150000 tons of RAS. There, roofers throw away their recycled tiles, and like most people who recycle them, ASR cuts them into smaller pieces than 3 / 8 inches by reducing the number of devices.
However, the asr, process takes on other forms-which is just the beginning of the company's involvement in the recycling of asphalted tiles.
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Horton has been busy developing new technologies for machining, separating and extracting asphalt tiles over the past decade.He says he has developed a
Two of the six patents relate to a new container design that collects tiles from roof workers in a more convenient and cheaper way than the traditional method. Three of these patents establish an effective method of mechanical extraction of raw asphalt from tiles to produce alternative roof particles, asphalt coated limestone, recycled asphalt and recycled glass fiber bundle powder.
In this application, Kraton high performance polymer emphasizes its styrene-butadiene-styrene (SBS) modified adhesive, which has been proved to have better properties than non-polymer modified adhesive.
Currently, Florida Department of Transportation (FDOT) allows up to 20% RAP, to be used in any mixture using PG 76-22 to take advantage of the cost-effectiveness of RAP and the performance benefits of polymers.
One of the problems with high RAP content is the replacement of recycled binders, which is equivalent to less original asphalt, thus diluting the content of the polymer.
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To solve this problem, Kraton recommends using its rejuvenating agent technology to activate RAP adhesives and
Kraton explained that using the concept of balanced hybrid design to optimize the cracking and rutting performance of asphalt mixtures is a way to allow asphalt manufacturers to find innovative ways to utilize RAP while maintaining performance.
In the design process, it is pointed out that if the crack resistance test results are low, the typical solution is to reduce the RAP content or increase the asphalt binder content; the latter is more expensive.
A survey of recycled asphalt pavement (RAP): NAPA found that the use of RAP is estimated to have increased by more than 36 per cent since 2009. In 2017 alone, RAP reduced demand for 3.8 million tons of asphalt binders and more than 72 million tons of aggregate, with a total valuation of more than $2.1 billion.RAP is popular mainly because of its ready supply and is expected to have 102.1 million tonnes in stock by the end of the construction season in 2017. It also produces high quality mixtures. The Federal Highway Administration (FHWA) report shows up to 30% of road performance.
