Capture carbon dioxide and store it in concrete

CO2 capture and storage in concrete

The construction sector is an increasing source ofcarbon emissions, and with the global shift towards greening this sector – and other sectors – we are in dire need of innovative solutions. In order to reduce these emissions and combat climate change, which is caused by carbon dioxide to a large extent.

From concrete to carbon reservoir

Concrete – which is considered one of the most widely used materials in the world after water – is the basis of many urban projects, from residential and commercial buildings to roads and bridges, as it is considered the cornerstone of the construction industry. There is hardly a project without its use, and despite its importance in developing societies, its environmental impacts cannot be ignored.

This is because the construction industry contributes to 37% of total carbon dioxide emissions – according to the United Nations Environment Program 2023 report – while the concrete industry contributes to about 8% of global carbon dioxide emissions. These numbers indicate the scale of the environmental problem that this industry may pose, and also highlight the importance of new technology, as concrete can be transformed from a mere material used in construction into an effective element in combating climate change.

Implementation steps

In order to implement this idea, researchers are focusing on developing innovative methods to modify the basic composition of concrete, with the aim of incorporating new materials that have a high ability to absorb carbon dioxide and trap it within the concrete structure.

It is worth noting that replacing some traditional components of concrete with materials capable of absorbing carbon could contribute to removing approximately 13.1 billion tons of carbon dioxide from the atmosphere annually, which helps – effectively – reduce global carbon emissions.

In addition, researchers have come up with another method, which is to inject carbon dioxide into concrete during its manufacture, so that the gas reacts with chemicals in the cement, leading to the formation of stable calcium carbonate.

This process is not new to nature, as carbonation occurs naturally in rocks, but in this case it occurs much faster; Therefore, it can be said that these strategies represent a step towards improving the environmental efficiency of concrete, and they enhance its strength and durability at the same time.

Benefits of carbon storage technology

Carbon storage technology helps significantly reduce harmful emissions. Between 85% and 94% of carbon dioxide injected into concrete is captured permanently and safely, and this high percentage of absorption turns concrete into stable reservoirs of carbon dioxide, which contributes significantly to reducing the concentration of Greenhouse Gases (GHGs) in the atmosphere.

This process also enhances the strength of the concrete itself. This is because the chemical reaction that occurs between carbon dioxide and chemical compounds in concrete contributes to improving the durability of concrete and increasing its lifespan, thus reducing carbon emissions and improving the quality of the material used in construction.

It should be noted that the benefits of this technology go beyond reducing concrete emissions to a greater level; By applying it on a large industrial scale, global emissions resulting from the cement industry can be significantly reduced. By injecting carbon dioxide into concrete, about 600 grams of carbon dioxide can be stored per cubic meter of concrete. Since concrete production worldwide reaches 30 billion tons annually, this technology shows tremendous potential in reducing carbon emissions.

Challenges

Despite all the benefits offered by this technology, there are several challenges facing its widespread application, and perhaps the most prominent of these challenges is securing a permanent and effective source of carbon dioxide; Because this technology depends on the presence of reliable sources of carbon dioxide.

One of the challenges is that the construction industry is known for its reluctance to adopt new materials, and this poses a major challenge when trying to introduce new materials that contain carbon dioxide, especially in applications that require high structural durability, such as high-rise buildings and bridges. Therefore, these materials may begin to be used in less hazardous applications, such as flooring, walkways and insulation, where the structural risks are lower.

The future of carbon reservoirs

The technology of storing carbon dioxide in concrete is a major step towards building a more sustainable future, and has received great support from governments and international organizations. For example, the US Department of Energy announced the allocation of $101 million to support the development of centers to test technologies for capturing carbon dioxide and converting it to the cement industry, which indicates global recognition of its importance and great optimism about its future.

In conclusion,Earth Guards realizes that achieving a balance between urban development and environmental preservation requires bold and innovative steps; Through techniques to capture carbon dioxide and store it in concrete, we open a new door towards more sustainable urban planning and communities.