Escrito por  2016-09-21

Cimento sem água é mais barato e emite menos CO2

(0 votos)

Cimento carbonatado

Se for amplamente adotada, uma nova abordagem para a fabricação de cimento poderá reduzir significativamente as emissões de gases de efeito estufa, diminuir o consumo de água e ajudar a lidar com o aquecimento global - além de produzir um concreto mais durável e de custo mais baixo.

Os pedreiros vão estranhar bastante, porque o novo tipo de cimento ganha resistência através da carbonatação, e não da sua mistura com água.

"Em vez de cimento que reage com água, este cimento carbonatado reage com dióxido de carbono e silicato de cálcio," explica o professor Jason Weiss, da Universidade Estadual de Oregon, nos EUA.

"À primeira vista este novo produto se parece com o concreto convencional, mas ele tem propriedades que devem fazê-lo durar mais tempo em algumas aplicações. Além disso, seu uso poderia reduzir as emissões de dióxido de carbono, que é um objetivo importante da indústria do cimento," acrescentou.

Cimento de silicato de cálcio carbonatado

O novo material foi batizado de "cimento de silicato de cálcio carbonatado", ou CCSC (Carbonated Calcium Silicate-based Cement).

De acordo com Weiss, o novo cimento está pronto para ser usado em produtos de concreto pré-moldados, que podem ser criados em uma fábrica e transportados para onde serão usados. Um uso mais generalizado poderá demorar mais tempo, já que a carbonatação exige um aparato mais complicado do que uma mangueira jorrando água sobre a massa - como botijões com CO2 sob pressão.

A equipe demonstrou que o material é mais resistente à degradação do que o concreto comum, inclusive em contato direto com sais usados para o degelo das estradas em países de clima frio, tais como cloreto de sódio e cloreto de magnésio.

O concreto - uma combinação de cimento, areia e brita - é um dos materiais de construção mais eficazes da história humana. Isto na verdade é parte do problema - o concreto funciona tão bem e tem tantos usos que são produzidas anualmente de 2 a 4 toneladas de concreto para cada pessoa na Terra, o que se acredita ser responsável por algo entre 5 e 8% de todas as emissões globais de dióxido de carbono.

socialshare

share on facebook share on linkedin share on pinterest share on youtube share on twitter share on tumblr share on soceity6

102080 comentários

  • list of auto insurances in Salisbury NC

    Куплю очередь на Vоlkswagen Polo Sedan комплектация Trendline или Comfortline, за разумное предложение.УФА или ЧЕЛЯБИНСКтел. 8-917-805-35-72.

    Link do comentário Sábado, 23 Setembro 2017 10:43 postado por list of auto insurances in Salisbury NC
  • no down payment auto insurance in Mobile AL

    What does a pale academic and his ilk possibly know about hunkering down in the sand as a modern day warrior while other men are trying their dead level best to kill you?Stick to your cocktail parties and let the real men do their job so those of us at home can live in peace, unmolested by steel and blood.

    Link do comentário Sábado, 23 Setembro 2017 10:25 postado por no down payment auto insurance in Mobile AL
  • cheap full coverage auto insurance Irvington NJ

    I usually dont usually post on many another Blogs, still I just has to say thank you& keep up the amazing work. Ok unfortunately its time to get to school.

    Link do comentário Sábado, 23 Setembro 2017 10:00 postado por cheap full coverage auto insurance Irvington NJ
  • no down payment auto insurance in Pacifica CA

    Mircea si care sunt mancarurile tale preferate? Ca si eu am cateva bucatarii preferate, fiindca nu mi s-a intamplat de multe ori sa mananc ceva de la ei si sa nu imi placa, si apoi sunt preparate care imi plac din alte tari :)

    Link do comentário Sábado, 23 Setembro 2017 09:24 postado por no down payment auto insurance in Pacifica CA
  • car insurance rates Ossining NY

    certainly like your web site but you need to take a look at the spelling on several of your posts. A number of them are rife with spelling problems and I find it very bothersome to inform the truth nevertheless Iˇ¦ll certainly come again again.

    Link do comentário Sábado, 23 Setembro 2017 08:21 postado por car insurance rates Ossining NY
  • installmentloans

    fast approval loans installment loan easy loans online [url=https://installmentloansmaster.org/]installment loan[/url] best debt consolidation loans companies

    Link do comentário Sábado, 23 Setembro 2017 06:59 postado por installmentloans
  • auto owners insurance Bloomington IL

    sorge dich nicht, tomtom, die anderen kinder in deiner klasse erklären dir früher oder später, worum es sich bei dem ominösen zeichen handelt.

    Link do comentário Sábado, 23 Setembro 2017 06:16 postado por auto owners insurance Bloomington IL
  • Damon

    I've just graduated http://www.btgrubu.com/prilosec-price.pdf prilosec price The World Health Organisation recommends daily levels of particulate matter with a diameter of 2.5 micrometers to be no more than twenty. Anything above 300 is considered dangerous. Levels around 1,000 were recorded in some parts of Harbin. All schools were shut and the airport was closed.
    http://www.turismistoric.ro/can-i-buy-clomid-privately.pdf can i buy clomid off the counter It was the first time they saw one another since Edward Snowden, an ex-National Security Agency contractor, was given temporary asylum in Russia earlier this year after leaking sensitive data on U.S. security agencies' operations.
    http://www.tyofysioterapeutit.fi/viagra-online-kaufen-deutschland-paypal.pdf#carrot acquistare viagra generico in contrassegno “Guys are just tired of it,” the player said. “The media circus that’s revolving around Alex is insane — and we haven’t even seen him. It just keeps going. It’s like a carousel that just keeps going around and around and around. At some point, it has to stop.
    http://datapeoplebd.com/prednisone-tablets-usp-20-mg.pdf#tools order prednisone online
    There are already seven proven vitamin A strategies in use today, including supplements and fortification of basic foodstuffs as well as community-based small holdings in poor regions to grow fruit and vegetables. “Golden” rice is not among them, because, as the International Rice Research Institute, which is developing the technology, admitted this year: “It has not yet been determined whether daily consumption of ‘golden’ rice does improve the vitamin A status of people who are vitamin A deficient and could therefore reduce related conditions such as night blindness. This process may take another two years or more.”
    http://www.pcperformance-store.com/where-to-buy-rogaine-shampoo.pdf#clever prescription strength rogaine Deputy Commissioner Peshawar, Zaheer Islam confirmed that four people were killed in the city. Cooked food was being provided to the affected people and dewatering machines were installed to pump out water from houses on Charsadda Road and other flood hit areas.

    Link do comentário Sábado, 23 Setembro 2017 05:43 postado por Damon
  • Arianna

    What do you do for a living? http://www.tyofysioterapeutit.fi/que-precio-tiene-el-viagra-en-espaa.pdf whats an average age men use viagra The statement says that Peter Passam, who was chairman of governors of two of the schools that now make up the federation when the first contract was signed with C2 Technology in 2009, "made clear to the investigating team during his interview with them in June 2013 that he knew about this connection and that the contract was awarded on quality and value for money".
    https://www.agath.com/how-long-does-it-take-for-neurontin-to-work-for-nerve-pain.pdf neurontin rx assistance About 50 million people lost power Aug. 14, 2003, when a tree branch in Ohio started an outage that cascaded across a broad swath from Michigan to New England and Canada. Commuters in New York City and elsewhere had to sleep on steps, hitchhike or walk home as trains were rendered powerless and gas pumps stopped working; food spoiled as refrigerators and freezers thawed; jugs of water sold out as supply plants lost their ability to supply consumers; minds were set to wandering about terrorism fears less than two years after 9/11. Ten years later, The Associated Press asked several people: Where were you during the blackout of 2003?
    http://www.drogeriewarenzeitung.de/does-100mg-of-clomid-increase-chances-of-twins.pdf where can i buy clomid for pct uk Last week, the new president's tone was endorsed by Iran's most powerful figure, Ayatollah Ali Khamenei, who spoke of "heroic flexibility," suggesting a new willingness to engage in diplomacy with Iran's adversaries.
    https://iifdc.org/index.php/viagra-pil-online-bestellen.pdf#ate best viagra in delhi European Central Bank (ECB) governing council member Christian Noyer listens to a speech by Bank of Japan Governor Masaaki Shirakawa (not seen) at the Paris Europlace Financial Forum in Tokyo December 3, 2012.
    http://www.samiselio.com/vente-cialis-sans-ordonnance.pdf#sheet vente cialis sans ordonnance The Giants need to get rid of the Super Bowl countdown clock in their locker room and immediately replace it with one on their season, because they are perilously close to having it all fall apart before they even get to October.

    Link do comentário Sábado, 23 Setembro 2017 05:43 postado por Arianna
  • Robin

    Why did you come to ? http://remor.pl/cheap-generic-viagra-reviews.pdf#sly womens viagra in canada Hunnam also talked about becoming a motorcycle-rider in real life. When he first lived in Los Angeles, the England-born Hunnam recalled, the choking traffic was a burden. "It really inhibited my desire to go out in the world," he said. Once he started riding a motorcycle, he felt a sense of liberation.
    http://prime-mfg.com.au/diamox-sequels-500-mg-dosage.pdf#vegetables diamox tablets altitude sickness Miss Townley said that after landing at Heathrow on a flight from Thailand Islam checked into a Travelodge hotel and at 11am the following morning, May 23, went to Hounslow police station and asked to speak to an officer.
    https://www.photorealism.com/methocarbamol-high-erowid.pdf can you buy robaxin over the counter in canada Before or after the 24th week of pregnancy the doctors usually want the new to-be-mom drink beverages which are highly sweetened, similar to the Tang. Some drinks suggested are fruity flavored too. Around thirty minutes later to this a blood sample is taken to test the sugar level.
    http://www.swimfantastic.com/seroquel-25mg-cost.pdf thuoc seroquel xr tab 50mg I didn’t like the looks of the other door (foam tiles stained red; the toe of a man’s shoe protruding from a pile of gravel) but at least most of the material blocking the door wasn’t very solid. Blundering back through, ducking some wires that sparked from the ceiling, I hoisted the bag over my shoulder and took a deep breath and plunged into the wreckage headlong.
    https://www.agath.com/is-225-mg-of-effexor-a-lot.pdf effexor discounts
    Localytics has also been tracking the sales of Cupertino's fondleslabs and notes that the iPad mini is a small but respectable share of the iOS tablet market at 17 per cent. By comparison Google's similarly sized nexus 7 has 16 per cent of the Android market, with Samsung stealing the lion's share of sales.

    Link do comentário Sábado, 23 Setembro 2017 05:43 postado por Robin

Deixe um comentário

Certifique-se de preencher os campos indicados com (*). Não é permitido código HTML.

Itens relacionados (por tag)

Entre em contato conosco

Vamos falar sobre seu projeto! Clique em Contato e preencha o formulário que entraremos em contato o mais breve possível.

Contato