PARIS: It was used to build the Great Wall of China and Spain's mediaeval Alhambra Palace - and now earth is back in vogue as a building material. Climate change has spurred renewed interest in the ancient technique which sees polluting concrete swapped where possible for earth. For centuries, mu
PARIS: It was used to build the Great Wall of China and Spain's mediaeval Alhambra Palace - and now earth is back in vogue as a building material.
"If we could reduce by 25 per cent the volume of cement consumed globally it would be equivalent to negating the impact on the climate of all air transport," he estimated.It involves compacting certain soils into a mold, of sorts, to make building blocks or build up whole walls, layer by layer. But it has downsides too, not least the cost, given the need to find builders qualified in ancient techniques."EARTH CONCRETE" HYBRID
French building material firm Saint-Gobain is experimenting with a hybrid system of"earth concrete", combining excavated earth from construction sites, steel industry waste and hemp. But, said Chateau:"In Africa, in Burkina Faso or Malawi, it's become a kind of artisanal savoir-faire to stabilise raw earth with cement at the foot of the building to solve the problem of water encroachment.""HUGE DEMAND"The site, in the western village of Schlins on the Liechtenstein border, creates foundations, floors and walls using chalk, clay, chopped straw, lime or gravel.Once dried and cut to size, the blocks are sent off to be assembled.
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