MILES AXLE Translation. Region: Russian Federation –
Source: Novosibirsk State University – Novosibirsk State University –
New building materials with a low carbon footprint have been developed by scientists from the Climate Center of Novosibirsk State University. Large-tonnage man-made waste from the mining, construction and energy industries is used in the production of these materials. Here, mineral raw materials obtained as a result of the demolition of buildings and structures, waste from quarries and mines for the extraction of minerals, metallurgical slag, as well as ash and slag waste from coal combustion at power plants are used. Thanks to the use of technology developed in the laboratory of the Climate Center, new cement-free building materials not only have a much smaller carbon footprint than traditional concrete, but are also capable of absorbing carbon dioxide from the atmosphere.
— Cement production is associated with high energy costs. The specifics of the technological process involve the firing of mineral raw materials, which results in the emission of carbon dioxide into the atmosphere, which ensures a high level of greenhouse gas emissions. About 800-900 kilograms of CO2 are emitted into the atmosphere per ton of cement produced. This puts the cement industry in third place in terms of anthropogenic carbon dioxide emissions. Therefore, the problem of decarbonization of the construction industry is relevant and quite acute. At our Carbon Polygon, we create technologies aimed at reducing the carbon footprint in the cement industry, developing and implementing alternative mineral binders and “green” building materials based on them, — explained Georgy Lazorenko, Director of the NSU Climate Center.
In the production of materials, the technogenic mineral raw materials used are subjected to high-intensity mechanical grinding and are divided into different fractions. In some cases, methods of preliminary heat treatment in a high-temperature furnace or in microwave heating chambers are used – depending on the purpose of the finished mixture that scientists intend to obtain. Next, the mineral raw material mixture is mixed with an activator on an alkaline or acidic basis. As a rule, it is an aqueous solution that is mixed with a solid mineral finely dispersed phase. As a result, a solution mixture is formed, the hardening of which ensures the formation of a ceramic or concrete-like material.
The use of man-made mineral raw materials with a high content of calcium and magnesium cations, capable of reacting with carbon dioxide to form stable carbonate minerals, in the production of binders ensures the binding of CO2 with the developed materials.
— We conduct research on the ability of materials to absorb carbon dioxide using a specially designed carbonization chamber, into which CO2 is pumped under pressure. Under controlled operating parameters — temperature, humidity and pressure — we forcibly carbonize the material and study the kinetics of the mineral carbonization process, — said Georgy Lazorenko.
Currently, the technology for producing cement-free low-carbon building materials is being developed in laboratory conditions. In the laboratory of the NSU Climate Center, scientists are optimizing the recipes and technological modes of producing materials, and are also developing approaches aimed at increasing the effect of absorbing carbon dioxide from the atmospheric air by materials. Also, in laboratory conditions, pilot samples of materials have been created using various types of man-made materials from various industrial facilities in the country.
Various products can be formed from the developed compositions. Currently, samples of tiles have been manufactured that can be used in urban infrastructure, as well as heat and sound insulation materials that can easily compete with products based on ordinary cements in terms of technical qualities and have a significant advantage in terms of carbon footprint.
Please note: This information is raw content directly from the source of the information. It is exactly what the source states and does not reflect the position of MIL-OSI or its clients.
Please note; This information is raw content directly from the information source. It is accurate to what the source is stating and does not reflect the position of MIL-OSI or its clients.