Showing posts with label Sustainable building materials. Show all posts
Showing posts with label Sustainable building materials. Show all posts

Thursday, May 28, 2009

Bio Degradable Insulation



A cutting edge Bio degradable Insulation for Construction and other purposes has appeared in the market.Their website says "...Greensulate™ is an affordable, environmentally-friendly drop-in replacement for the expanded polystyrene used in cavity walls and structural insulating panels.

Greensulate™ is produced from natural byproducts, such as buckwheat hulls and cotton burrs, without heat or light input. With superior strength and comparable insulating properties, Greensulate™ insulation helps you reduce the amount of energy used to build your home, and increases your efficiency over the long haul..."

Saturday, September 06, 2008

Palmyra House



Inhabitat says "...Pitched as having over 800 uses, the Palmyra Palm (or Borassus) is recognized as one of the most important trees in Cambodia and India. Earlier this year, Indian born architect Bijoy Jain of Studio Mumbai illustrated the ecological potential of the palm when he designed and built the beautiful Palmyra House. Constructed entirely from locally sourced and sustainably harvested palmyra, the home is sited on a working coconut plantation in the East Indian coastal town of Alibaug..."

Photos courtesy of inhabitat

Wednesday, April 16, 2008

Bamboo Revolution


In an article in Newsweek magazine titled "Stronger than Steel" , Lily Hunag writes about how "bamboo may be the most useful raw material ever to be overlooked.The talks about the bicycle built by Nick Frey a junior at Princeton out of Bamboo.


"...Although a common building material in many tropical countries, it's considered "the poor man's timber," and in the West it's mainly decorative. As the world goes green, however, bamboo's essential qualities are beginning to win converts. Environmental organizations are promoting its use as a building material, architects are putting it into green homes, and makers of flooring, furniture and now bikes are quietly setting up their industries for a bamboo revolution.

Despite its lowly reputation, bamboo may be the strongest stuff on the planet. It has greater tensile strength (or resistance to being pulled apart) than steel, and it withstands compression better than concrete. Both qualities are essential to keeping the plant, which grows to nearly 60 meters but is only as wide at the base as the very top, from falling over. It needs the compression strength to hold up its own weight and tensile strength to bend in the wind without breaking..."


Other interesting attributes associated to bamboo include:

1.It has the ability to be formed be formed into Plywood."..."Our concept of strength is, it doesn't move, it doesn't break," says Dan Smith, who owns Smith & Fong, the largest manufacturer of bamboo plywood in the United States. "The Chinese concept is, you've got to bend with things. If you don't bend, you break. Bamboo's strength is in its ability to bend, and that's the miracle."

2. Some species grow very fast which makes it a very sustainable material."...The Western mind is also opening to bamboo's environmental qualities. In both temperate and tropical climates, it grows as quickly and abundantly as a weed. Though most often used as an alternative to timber, bamboo, with its underground rhizome root system that continually regenerates the plant when the stalks are cut, is technically a type of grass. In fact, it grows faster than any other grass—in some conditions well over a meter a day..."

3. Its structural strength,affordability,versatility has made it attractive to Eco-Architects and builders."...Designers are getting more creative as they embrace bamboo as an alternative to lumber. Environmentalist architect Michael McDonough has incorporated bamboo in his two working prototypes for sustainable housing, e-House and ArcHouse. E-House has all-bamboo floors and cabinetry. A stalk of bamboo becomes a finer version of plywood once it's split from the top and milled into smooth strips. ArcHouse, a modular home, has an exterior made from double panels of bamboo oriented strandboard—bamboo strips compressed and cross-positioned for strength— and insulated with foam made from the oil of orange peels. The panels seal tighter than conventional insulation, and McDonough is the first to replace wood strandboard with bamboo. "It's dinosaur grass," he says, yet it's pushing the engineering curve..."

Bamboo is still a niche material in the United States, but it's catching on. Smith & Fong first cracked the markets in 1989 with flooring and, later, a laminated bamboo sheet called "plyboo." Sales grew at an average of 26 percent a year until 2003, then accelerated to nearly 40 percent three years ago. The company now has 30 types of flooring and 60 options in plyboo, and has begun engineering gymnasium floors and bamboo structural beams. Bambu, a U.S. maker of housewares that are distributed by Whole Foods, has begun to draw attention at its plant and showroom in Shanghai.

Some excerpts and photo's in this article are taken form Newsweek and the Smith & Fong website.

Thursday, November 15, 2007

Henry Liu's Green Fly-Ash Bricks



The National Science Foundation website says "...Researchers have found that bricks made from fly ash--fine ash particles captured as waste by coal-fired power plants--may be even safer than predicted. Instead of leaching minute amounts of mercury as some researchers had predicted,the bricks apparently do the reverse, pulling minute amounts of the toxic metal out of ambient air.

Each year, roughly 25 million tons of fly ash from coal-fired power plants are recycled, generally as additives in building materials such as concrete, but 45 million tons go to waste. Fly ash bricks both find a use for some of that waste and counter the environmental impact from the manufacture of standard bricks.

"Manufacturing clay brick requires kilns fired to high temperatures," said Henry Liu, a longtime National Science Foundation(NSF) awardee and the president of Freight Pipeline Company (FPC), which developed the bricks. "That wastes energy, pollutes air and generates greenhouse gases that contribute to global warming. In contrast, fly ash bricks are manufactured at room temperature. They conserve energy, cost less to manufacture,and don't contribute to air pollution or global warming."

Once colored and shaped, the FPC bricks are similar to their clay counterparts, both in appearance and in meeting or exceeding construction-material standards.

Supported by NSF's Small Business Innovation Research (SBIR) program, Liu has been working since 2004 to develop the bricks. The first phase of support enabled him to make fly ash bricks more durable by engineering them to resist freezing and thawing
due to weather. Liu is now working from a second-phase SBIR award to test the brick material's safety and prepare it for market.

"Green manufacturing is a focus for the nation," said Tom Allnutt of NSF's SBIR program, who oversaw Liu's award. "Liu's innovative use of fly ash to manufacture high quality building materials will potentially decrease some of the negative environmental impact of coal-fired power generation while meeting increasing demands for greener building materials."

While researchers need to study the bricks further to determine how the mercury adsorption occurs and how tightly the metal is trapped, the new findings suggest the bricks will not have a negative impact on indoor air quality.

On average, air contains low amounts of mercury that can range from less than 1 nanogram per cubic meter (ng/m3) to tens of ng/m3--a small fraction of the Environmental Protection Agency limit for continuous exposure.

Inside a confined experimental chamber, the bricks did not raise the mercury levels in the surrounding air (originally more than one nanogram), and instead appeared to lower the concentration down to roughly half a nanogram.

Engineers from FPC of Columbia, Mo., developed the bricks with NSF support and reported their findings on mercury leaching at the May 7-10, 2007, World of Coal Ash Conference in Cincinnati, Ohio.

Henry Liu has received a number of NSF awards since 1980 and founded FPC after retiring as professor of civil engineering and director of Capsule Pipeline Research Center, a state/industry university cooperative research center established by NSF at
University of Missouri-Columbia in 1991 to research and develop capsule pipeline technology..."

Photos courtesy of National Science Foundation