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Aluminum Reinforced Concrete Bench

Metal News - Published on Mon, 07 Oct 2019

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One of the world's first aluminum reinforced concrete structures was revealed at a trade fair in Trondheim, Norway. It is considered a given that steel is what is used as reinforcement in concrete, not aluminum. The reason is that the pH of ordinary concrete is so basic (high pH) that aluminum corrodes. But imagine if it was not the aluminum’s “fault”, but rather the cement, a creative researcher dared to ask – and decided to invent a new concrete that is not so alkaline. A few years later, it turns out that the new concrete, in addition to being suitable for aluminum reinforcement, has many and surprisingly significant benefits related to environment and quality, which can revolutionize the concrete industry:

The new concrete requires far less energy and CO2 emissions to produce
It enables slimmer concrete structures (smaller volumes of concrete)
The concrete becomes maintenance-free
It can even absorb and store CO2 from its surroundings during the use phase

With aluminum this is different. Aluminum has a natural "membrane" of oxide that protects the metal against corrosion, so it can resist and endure air and seawater far better than steel. That is why you do not need to use such dense concrete to protect the reinforcement, nor thick covering. The concrete structures can be given less weight and a wider variety of design possibilities, a longer life and less maintenance.

Aluminum reinforcement allows the use of binders (which steel cannot withstand) that result in far less CO2 emissions compared with traditional cement clinker. A lot of the cement (about 55%) is replaced by ordinary clay and other binders that do not decompose CO2 like the cement clinker does, and is burned (produced) at lower temperatures. Yes, actually at 850 degrees instead of 1,450 degrees. This, of course, saves huge amounts of energy and emissions.

The new concrete has additional environmental benefits. If desired, the concrete can even be blended by using seawater, which is a huge advantage in places with limited access to freshwater.

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Posted By : Rabi Wangkhem on Mon, 07 Oct 2019
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