VANCOUVER Mark Andrews Shirt , June 15 (Xinhua) -- Researchers here announced this week they have developed a new polymer-infused concrete that is stronger than typical concrete, and could reduce tire waste while making concrete construction more environmentally-friendly.
The engineers at the University of British Columbia (UBC) said their new concrete was made of polymer extracted from recycled tires and could be used to make buildings, roads, dams and bridges.
The researchers created their concrete mix using 0.35 percent tire fibers to produce a stronger and more environmentally-friendly concrete,Obinna Onuaguluchi, a post-doctoral fellow in civil engineering at UBC, said in an interview.
The polymer fibers from tires makes the concrete stronger, more resilient and longer-lasting Hayden Hurst Shirt , he said.
Asphalt roads with rubber crumbs from shredded tires already exist in the United States, Germany, Spain, Brazil and China, "but the problem with crumb rubber is that when you add it to concrete, it tends to reduce the strength," he said.
"This time we are using this (new mixture) to prevent cracking," he said Justin Tucker Shirt , noting that crumb rubber has traditionally been used as a filler in concrete mix, but not as a strengthener.
"Our lab tests showed that fibre-reinforced concrete reduces crack formation by more than 90 percent compared to regular concrete," Onuaguluchi said. "Concrete structures tend to develop cracks over time, but the polymer fibers are bridging the cracks as they form, helping protect the structure and making it last longer."
UBC civil engineering professor Nemkumar Banthia, who supervised the work, said the environmental and industrial impact of the research is significant.
Up to 3 billion tires were produced around the world every year, generating some 3 billion kg of fibre when recycled.
The new concrete "can be used almost anywhere Terrell Suggs Shirt ," Banthia said, adding China and India, both producers of large amounts of tires annually, are leading the world in new concrete infrastructure construction.
"China ... produces almost 400 million tires every year," Banthia said, adding only 15 percent of those tires get recycled. "There's great deal of tires in China that are actually going into landfills."
He said those tires could be repurposed into the UBC concrete recipe and brought back into the construction industry for buildings, bridges and roads.
"By bringing in a (tire) by-product, you're not only fixing that problem of tire disposal Marshal Yanda Shirt , but also reducing the carbon footprint of the concrete industry in China or wherever else," Banthia said.
The applications for the new concrete are vast, he said, listing "all kinds of infrastructure, but in particular, structures that are subjected to extreme climate conditions and extreme loading."
The researchers used the new concrete to resurface the steps in front of a building at UBC last month.
Banthia's team was tracking its performance using sensors embedded in the concrete to look at the development of strain, cracking and other factors.
So far, the results support laboratory testing that showed it can significantly reduce cracking. Banthia said they are now planning further test projects in Canada C.J. Mosley Shirt , the United States and India.
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HAVANA, March 16 (Xinhua) -- The Cuban boxing team, known as "Domadores" (Tamers), is stepping up its training for the match against the United States "Knockouts", in the semifinal of the fourth World Series of Boxing (WSB).
The Cuban Boxing Federation announced that two boxers per division will participate in the match against the United States to be held in Miami on March 28.
Heavyweight Erislandy Savon Joe Flacco Shirt , WSB No. 1 ranked boxer, leads the Cuban team.
Savon has obtained five victories and leads the 91-kg division with 747 points, the highest ranking among the WSB participants.
The Cuban team also includes Yosbani Veitia (49kg), Marcos Forestal (56kg), Yasniel Toledo (64kg) and Ramon Luis (75kg).
Light flyweight Veitia leads the 49kg category with 737 points, as well as Luis, leader of the 75kg category also with 737 points.
With 28 points, the highest score in WSB Lamar Jackson Shirt , Domadores was defeated for the first time last Wednesday, by the Russian team in Moscow, during Group B's last match of the qualification round.
Two weeks ago, Cuban local news site Cubasi (www.cubasi.cu) said Cuban Pedro Roque is the coach of the American team, who had led the island's team in Beijing 2008 and for several years he led the Cuban youth team.
Roque called 10 men in the U.S. team, including two foreign boxers such as Chinese Lu Bin (49kg) and Dominican light welterweight Carlos Adames, who won bronze medal in the Pan-American championships last year.
The U.S. official playroll also include Stephen Fulton (56kg), Caleb Plant (75kg) and Joshua Temple (91kg).
Substitute boxers of the U.S. team include Puerto Rican Anthony Chacon (49kg) Jaleel Scott Jersey , Guatemalan Juan Reyes (56kg), light welterweight U.S. Nicholas Jefferson, Ecuadorian Marlo Delgado (75kg) and U.S. cruiserweight Earl Newman.
This will be the first time that Cuba and U.S. will face in a team-fight competition in round-trip matches, in semi-professional five-round fights.
The last time Cuba met the U.S. boxing team was in 2006 Azerbaijan World Cup, where the island won 11-0.