A concrete that researchers define as more resistant to both salt and water was created by a group of researchers at Brunel University in London.
It is a low-cost concrete whose main characteristic is its high resistance to salt. The latter is in fact dispersed on the roads during the winter season to prevent the formation of ice by the water. In this way, part of it comes into contact with many other city structures, such as sidewalks.
However, the structures made of concrete absorb the salt with harmful consequences, especially when inside it there is steel: the latter ends up stiffening and ending. Researchers have created a new mix that can absorb 90% less salt than classic concrete.
It can also absorb 64% less water, another very important feature for the strength of the concrete itself. And this, according to the researchers, is despite it being 42% stronger.
It would therefore seem a huge step forward in attempts to make roads and sidewalks better resist the large quantities of salt that are dispersed during the winter. The secret? Researchers added sodium in the concrete. Sodium acetate forms crystals that coat the pore walls in concrete, increasing hydrophobicity and resistance to salt.
The study was published in the Journal of The Minerals, Metals & Materials Society.
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