PERMEABLE CONCRETE

 We are living through complicated times, on the one hand, floods destroying lives and cities, on the other, people going through problems related to lack of water. But you might ask yourself: What does civil engineering have to do with it? Could it alleviate both problems? The answer is: Yes!



As we have already noted, civil construction is not made up of vicious circles, but of innovations. As the days go by, new materials are explored, replaced or improved, all in a way that meets the country's economic, sustainable and social needs. And it was with this in mind that the British construction materials company, Lafarge Tarmac, produced a concrete capable of absorbing up to 4,000 liters of water in less than a minute. This permeable concrete is called TOPMIX and is effective in preventing floods; avoid possible traffic accidents on wet roads; reduce the heating of the slopes and, on top of that, store the water.


How?




TOPMIX has integrated drainage channels that allow rainwater to pass through it and be stored in lower layers until it is led to the water table via the subgrade, or else taken to the city's drainage system. "During periods of increased temperatures and intense rain, the water stored within the system evaporates, creating a cooling effect that reduces the surface temperature", says the company. Thus, there is no loss of paving space and there is an area ready for the absorption of precipitation, preventing floods and feeding back into the underground aquifer.



However, as everything has its pros and cons, the company claims that in places with very low temperature, confined water can freeze, damaging the floor and, according to American standards, when the soil is adequate, in 72 hours the stored water is absorbed and released into the aquifer. If the subsoil is compact and impermeable (clay soil, for example), however, the water that remains in the base and sub-base cannot go quickly to the water table and ends up accumulating in the granular reservoir. In this case, the stone layers of the structure can fill and overflow the surface, regressing onto the porous concrete.

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