{"id":91062,"date":"2024-11-10T14:05:57","date_gmt":"2024-11-10T14:05:57","guid":{"rendered":"https:\/\/ainalalam.com\/?p=91062"},"modified":"2024-11-10T14:05:57","modified_gmt":"2024-11-10T14:05:57","slug":"understanding-green-concrete-a-path-to-more-sustainable-construction","status":"publish","type":"post","link":"https:\/\/ainalalam.com\/?p=91062","title":{"rendered":"Understanding Green Concrete: A Path to More Sustainable Construction"},"content":{"rendered":"[mhc_section admin_label=”\u0642\u0633\u0645” fullwidth=”on” specialty=”off”][mhc_fullwidth_menu admin_label=”\u0642\u0627\u0626\u0645\u0629 \u0628\u0639\u0631\u0636 \u0643\u0627\u0645\u0644” menu_id=”56″ background_color=”#ffffff” background_layout=”light” text_orientation=”center” submenu_direction=”downwards” fullwidth_menu=”off”] [\/mhc_fullwidth_menu][\/mhc_section][mhc_section admin_label=”section” transparent_background=”off” gradient_background=”off” background_color=”#ffffff” gradient_style=”horizontal” 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\u00a0<\/strong><\/p>\n

By Jose Vera Agullo, Head of the Concrete Group of ACCIONA’s Construction Business <\/em><\/p>\n

\u00a0<\/em><\/strong><\/p>\n

Concrete has been in use for more than two millennia, dating back to when the Romans employed a similar material known as opus caementicium. Its durability, versatility, and ease of transport make it difficult to replace, especially in large infrastructure projects like bridges and tunnels where it is essential. However, the production of concrete has a significant drawback\u2014its manufacturing process is carbon-intensive, particularly in the creation of clinker, a key ingredient. The question arises: is it possible to produce a greener, more sustainable version of concrete? Progress in this field is already underway, with both experimental techniques and proven methods offering various ways to reduce emissions.<\/p>\n

But what is precisely the clinker? <\/strong><\/p>\n

Clinker is a crucial element in cement production, and cement, in turn, is an essential component of concrete. It is produced by heating a precise mixture of raw materials\u2014mainly limestone (calcium carbonate) and clay\u2014at extremely high temperatures, typically between 1,400 and 1,500 degrees Celsius.<\/p>\n

During the heating process in a rotary kiln, the raw materials undergo chemical reactions, producing small gray pellets or nodules known as clinker. These nodules contain the primary compounds that give cement its binding characteristics: calcium silicates and aluminates.<\/p>\n

Once cooled, clinker is ground into a fine powder and mixed with a small amount of gypsum to create cement. Gypsum controls the cement\u2019s setting time when it is combined with water. The most commonly used cement in construction is Portland cement, derived from this process.<\/p>\n

Clinker production is responsible for significant carbon emissions. About one-third of CO\u2082 emissions stem from the extensive energy consumption during the calcination and grinding processes, while the remaining two-thirds result from the chemical decarbonation of limestone during production.<\/p>\n

Some strategies to lower concrete’s carbon footprint<\/strong><\/p>\n

Several methods are currently being implemented to create low-emission green concrete. Alongside recycling initiatives, the following approaches are considered among the most impactful:<\/p>\n