NJIT professor promotes building material of millennium: Autoclave aerated concrete

November 7, 2012

Although widespread rebuilding in the hard-hit New York metro region from Super Storm Sandy has not yet begun, NJIT Assistant Professor Mohamed Mahgoub, PhD, PE, says when the hammers start swinging, it's time to look at autoclaved aerated concrete.

The material, best known as AAC, has been heralded as the of the new millennium. It's a lightweight, easily-crafted manufactured stone, strong enough to withstand earthquakes and hurricanes when reinforced with steel.

The material is used widely worldwide, says Mahgoub, who will be a featured speaker early next week at the 2012 China-US BOAO Manufactured Stone Conference in Zhengzhou Henan, China.

Mahgoub is also the coordinator of the NJIT Concrete Industry Management (CIM) program, which is only one of a select few programs of its kind across the U.S. This semester CIM students are testing and analyzing AAC. "It is an environmentally-friendly solution for future building problems and it is also an extremely efficient, specialty fabrication material," he says. "Cuts can easily be factory controlled. AAC is available throughout the U.S. and Canada. There is currently one U.S. manufacturer in Florida with plans to open another manufacturing operation in New Jersey."

AAC was discovered as a timber alternative in1920 by Dr. Axel Eriksson of the Royal Institute of Technology in Stockholm, Sweden. Currently there are more than 325 worldwide that annually manufacture more than 25 million cubic yards. China is now in the midst of building more plants. Europeans have been using the material for the past 60 years; Russia is the greatest user. In the U.S., its presence has increased over the past 15 years.

AAC is workable and lightweight like wood. It can provide outstanding , is resistant to fire, and decay. A concrete product, AAC consists of finely ground sand, cement, quick lime, , aluminum and water. "Most sand is too coarse for the manufacturing of AAC," notes Mahgoub. Mills rotated by 500 horse power electric motors grind the grains up into a finer consistency, then pump the ground material into slurry tanks. The raw slurry is agitated constantly and mixed with water to hydrate the cement and to control the mix consistency. Aluminum paste or powder, mixed with water, is then introduced. The aluminum slurry is added to the mix and a chemical reaction produces a hydrogen gas that increases the mix volume. The result is a fine cellular structure of the finished product.

AAC can be used as roof, floor, vertical or horizontal wall panels, shaped into blocks and more.

Explore further: Link between vascular disease and disc height loss examined

More information: http://www.njit.edu/news/experts/mahgoub.php

Related Stories

Link between vascular disease and disc height loss examined

June 8, 2012

(HealthDay) -- The association between vascular disease, as measured by abdominal aortic calcifications (AACs), and disc height loss is independent of cardiovascular disease and is largely explained by patient age, gender, ...

After stroke, when and how to use assistive devices?

August 17, 2012

Difficulty in remembering and using spoken or written words, known as aphasia, can be a painful side effect of stroke. For some patients, that difficulty can last long after their stroke, causing a severe decrease in their ...

Laying the foundations for a green industry

July 31, 2006

Australian university researchers have developed a strong, lightweight building material that they believe could generate a thriving new "green" industry for countries such as China and India.

Recommended for you

Microsoft aims at Apple with high-end PCs, 3D software

October 26, 2016

Microsoft launched a new consumer offensive Wednesday, unveiling a high-end computer that challenges the Apple iMac along with an updated Windows operating system that showcases three-dimensional content and "mixed reality."

Making it easier to collaborate on code

October 26, 2016

Git is an open-source system with a polarizing reputation among programmers. It's a powerful tool to help developers track changes to code, but many view it as prohibitively difficult to use.

Dutch unveil giant vacuum to clean outside air

October 25, 2016

Dutch inventors Tuesday unveiled what they called the world's first giant outside air vacuum cleaner—a large purifying system intended to filter out toxic tiny particles from the atmosphere surrounding the machine.


Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.