abundance

Although transport or energy are the sectors that first come to mind when we talk about emissions, there is a third industry with a comparable share of responsibility: construction, responsible for 34% of global CO₂ emissions, according to the International Energy Agency. The problem is in the materials: manufacturing a ton of Portland cement emits between 0.6 and 0.8 tons of CO₂ both due to the energy consumed in the process and the chemical reaction that produces it. So any idea to replace classic construction materials such as concrete and brick is good to decarbonize the industry. We have already seen alternatives such as the shells on the beachbut to a company in Dubai Another idea has occurred to him: instead of importing materials, manufacture them with abundant resources in the area. More specifically, with sand and date seeds. The invention. The star product of ARDH Collective, which is the name of the Dubai company formed by Alhaan Ahmed, Alyina Ahmed and Máximo Tettamanzi, is DuneCrete: An alternative to concrete made from locally sourced desert sand, which reduces cement content by 50%. From there they manufacture the DuneBlockthe building blocks. In their product catalog they also have the Dateforma material that reuses 1,000 date seeds per square meter. Why is it important. Because after water, sand is the second resource we consume the most. The United Nations Environment Program esteem that up to 50,000 million tons of sand and gravel are consumed annually worldwide. Removing sand from rivers and coastal ecosystems causes erosion, damages water supplies, harms biodiversity and reduces storm protection, so replacing it with underused desert sand would be a turning point. DuneCrete reduces cement content by 50%, which according to its founders represents approximately half the carbon dioxide emissions compared to conventional concrete. It makes sense: Portland cement alone is responsible for 8% of global emissions and its footprint does not disappear using renewable energy, since much of it comes from a chemical reaction, not from burning fuel. Context. Paradoxically, the UAE has to import sand even though it is basically a desert. The underlying problem is that desert sand particles are rounded due to wind erosion, which makes their adhesion in conventional concrete mixtures difficult, while river sand has more angular particles that favor compaction and resistance. In detail. This project arose during a master’s degree at the Architectural Association School of Architecture in London. After obtaining a couple of grants totaling $8,000, they began research in a laboratory that they set up in the garage of one of their homes in Dubai during the pandemic. That was where they found the formula that stabilized the mixture with desert sand. Laboratory tests confirmed that the material met the resistance standards necessary for commercial development. The company start production in 2021. Yes, but. Once the problem of the geometry of desert sand has been solved, there is another obstacle to solve to scale the project: its morphology varies enormously by region and is not homogeneous. ARDHCollective affirms DuneCrete is “just as strong” as conventional concrete, but there are no academic publications or third-party test reports to support its mechanical properties. Simply put, the transformative potential of this DuneCrete remains to be seen. In Xataka | A young woman from Kenya has developed brick 2.0: the main ingredient is the plastic of the shampoo bottle In Xataka | We have just reinvented the brick. It is just as it was millennia ago Cover | ARDHCollective and Fredrik Öhlander