Cement and concrete are major problems of global warming resolution

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"The way cement is present does not match the Paris agreement." "If the innovative change does not occur, the world will not be able to achieve the goal of climate change," according to the Carbon Disclosure Project (CDP) of international NGO tackling the environmental field ) Announced. Concrete is necessary to make a large-scale environmentally friendly facility, but a paradox that discharges a large amount of carbon dioxide in the process of making cement is a problem.

Cement report - CDP
https://www.cdp.net/en/investor/sector-research/cement-report?gclid=EAIaIQobChMIis6d45qs2gIVHAQqCh1paAZsEAAYASAAEgKeV_D_BwE

Are we stuck with cement? | The Outline
https://theoutline.com/post/5124/are-we-stuck-with-cement-environmental-impact

Cement used for solidifying sand, gravel, water etc. in concrete plays an important role in economic growth, and Smil Watslav's " Making the Modern World: Materials and Dematerialization " includes " In China in 2013, the US used more cement than we used through the 20th century. " However, according to the report of CDP, unlike the transport sector where carbon dioxide emissions are dramatically decreasing due to the substitution of fossil fuels in addition to the steel industry, the cement industry has many emissions of carbon dioxide, and "cement process" The problem is that it is an issue. Cement goes through a process of mixing limestone as a raw material with other materials and incinerating it at high temperature. At this time, carbon dioxide is discharged in tons by decarbonation of calcium carbonate in limestone.

Concrete is necessary both for upgrading roads in preparation for running automated driving cars, for building environmentally conscious LEED certified buildings, as well as for making wastewater treatment plants and desalination plants. In other words, we need the infrastructure to move to a carbon-neutral world, but there is a paradox that it is necessary to use concrete that emits more carbon to carry it out.

by Huskyherz

In order to reduce carbon dioxide emitted during cement production, it is necessary to develop a completely new material or a mechanism to extract carbon. Researchers in materials science are already working on the development of cement with low calcium content and Professor Franz-Josef Ulm of the Massachusetts Institute of Technology has succeeded in drastically reducing the carbon dioxide emissions associated with cement production I will. This method has also succeeded in doubling the strength of cement, but since it has not been done for a long-term durability test, it has not reached the market in general.

"We developed Ferrari, but next time we need to create Ford," Ulm says. Professors Ulm and colleagues in cooperation with the Portland Cement Association (PCA) of a nonprofit organization are moving to make alternative cement mainstream in the industry for the next research.

On the other hand, according to CDP, there is no tendency for the cement industry to finance research to develop alternative materials for low cost and low carbon dioxide. Also, due to lack of scientific insight, many companies are focusing on improving subsequent mixers rather than the process in which carbon dioxide is generated. A large-scale infrastructure that reduces carbon dioxide emissions, which solves global warming as it is, can not avoid cement problems. Therefore, it is said that it is required to scale back development and promote the development of new materials and to regulate the cement industry.

However, Marco Kisic, the author of the report on CDP, said that "the cement industry is beginning to understand," he revealed that he is optimistic about the new technology being used. "There are several relatively easy options the industry can take to realize a sustainable form such as changing the raw material of cement from cleanliness to clean one." "Development of carbon extraction system, carbon pricing , The difficult things such as low-carbon cement will slowly advance afterwards, "Kisic says.

by Swapnil Sharma