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PAVEMENT PERFORMANCE TESTING
In 2021, Pennsylvania mixed plastic equal to about 150,000 shopping bags into 1.5 miles of road at Ridley Creek; later checks found it performing like normal asphaltIn Pennsylvania, innovative engineers have embarked on a groundbreaking project, integrating recycled plastic from single-use shopping bags...- Since 1978, Caltrans has used recycled tire rubber in 17 asphalt overlays; a technical review found less cracking, distress and maintenance than conventional mixtures, including thicker onesIn the United States, an astounding 273 million tires are discarded every year, resulting in a considerable amount of waste. To address thi...
- In Hong Kong, engineers turned waste glass into concrete blocks; 15 years later, field checks found no cracking from the reaction that can damage glass concreteFor over 15 years, engineers in Hong Kong have pioneered the use of recycled glass in concrete pavers, meticulously studying their performa...
- In the late 1970s, a Wyoming section of I-80 used 85% recycled pavement; an FHWA review reported that it lasted 12 years before rehabilitationAsphalt recycling has been an effective method for over half a century, playing a vital role in maintaining our roads. However, a recent in...
- In Burgundy, France, 17,000 tonnes of discarded foundry sand went beneath RN 80; two years later, tests found good road strength and no environmental impactIn Burgundy, France, engineers have made strides in sustainable construction by incorporating about 17,000 tons of foundry sand waste into ...
- In Burgos, Spain, engineers turned steelmaking waste into full-size pavement slabs; five years outdoors caused no major damage, and skid resistance stayed road-safeIn an innovative endeavor, engineers from Burgos, Spain, developed sustainable pavement utilizing waste from steel production, significantl...
- LANXESS, Hindustan Colas sign pact to advance innovative road construction technologies in IndiaLANXESS and Hindustan Colas have signed a memorandum of understanding for future collaboration. They aim to explore advanced road construct...
- In 1991, Minnesota mixed factory-made shingle scrap into Highway 25 near Mayer; by late 1995, the asphalt performed at least as well as control sectionsEngineers in Minnesota have investigated the potential of recycled asphalt shingles for road construction to mitigate landfill waste. Their...
- In 1994, Georgia mixed damaged factory roofing shingles into Chatham Parkway asphalt; later checks found the recycled road performing as well as its controlEvery year, millions of tons of asphalt shingles end up in landfills, presenting significant waste management issues. The Georgia Departmen...
- In 1979, Minnesota began mixing ground-up scrap tires into two asphalt test roads; years later, FHWA said both experimental sections were still performing wellIn Minnesota, a trial was conducted to explore the use of recycled tire rubber for enhancing roadway performance in winter. Utilizing PlusR...
- In 1987, Kentucky put 40% power-plant bottom ash into 1 mile of State Route 3; later testing found excellent performance and strong skid resistance on the roadEngineers in Kentucky embarked on a pioneering project to incorporate bottom ash from coal-fired power plants into asphalt mixtures. Their ...
- In 1986, Illinois rebuilt 4.14 miles of I-57 using recycled concrete; 20 years later, load transfer efficiency across transverse cracks still averaged over 90%In the 1980s, the Illinois Department of Transportation pioneered a project that involved recycling roadway concrete into new pavement. Aft...
- Newark airport used coal waste in runways built for jumbo jets: What FHWA found 20 years laterA 1970s pavement project at Newark International Airport in New Jersey used coal fly ash, lime, Portland cement and sand to create a stabil...
- In 1990, Switzerland crushed an old A13 road and reused 66% to 100% of it in new concrete; 20 years later, every recycled test mix was still rated good or very goodNew research highlights the impressive durability of Swiss highways built with recycled concrete over several decades. The A13 motorway too...
- Some US roadside signs are designed to break or bend when a car hits them; the unusual design keeps the signpost from becoming an even more dangerous obstacleIn America, road signs play a vital role in ensuring driver safety, incorporating advanced breakaway supports designed to minimize injuries...
- In 1932, a pilot spotted giant human and animal figures carved into California's desert; the largest stretches 171 feet from head to toeGiant desert drawings near Blythe, California, have been dated using rock varnish. These ancient figures are now estimated to be at least o...
- In 2019, South Africa put 700 kg of waste plastic into a 300-metre road; Jeffreys Bay turned discarded packaging into its asphalt surfaceIn 2019, South Africa put 700 kg of waste plastic into a 300-metre road; Jeffreys Bay turned discarded packaging into its asphalt surface. ...
- In 2018, Melbourne put 200,000 plastic bags, 63,000 glass bottles and 4,500 used printer cartridges into a road; 250 tonnes of recycled asphalt showed 60% better fatigue resistanceIn 2018, Melbourne tested a road with an unusual ingredient list: 200,000 plastic bags, 63,000 glass bottles and 4,500 used printer cartrid...
- In 2020, California repaved a highway using recycled materials, including 150,000 plastic bottles per mile; it could last 2-3 times longer than conventional asphaltCalifornia transportation officials tested recycled pavement using plastic bottle binder. This pilot project on Highway 162 consumed approx...
- In 2025, Nebraska put two million plastic bags into a 4,000-foot road; it became the state’s first recycled-plastic roadNebraska put the equivalent of two million plastic bags into a 4,000-foot road in 2025, creating the state’s first recycled-plastic road. T...
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