Concrete is one of the strongest building materials invented by mankind at present. Most of the buildings in the city are made of concrete. However, there is huge environmental pollution in the production process of concrete. First of all, the basic component of cement needs to heat calcium carbonate or limestone during the manufacturing process, and add glue that can make the concrete strong. This process will release a lot of carbon dioxide into the atmosphere.
According to statistics from the International Energy Agency, the greenhouse gases generated in the cement manufacturing process account for about 7% of the total global greenhouse gas emissions and have become the world ’s second largest source of carbon dioxide industrial gas emissions. Another data from the United States Geological Survey shows that global cement production in 2017 alone caused about 4 billion pounds of carbon dioxide emissions.
To solve this problem, a Canadian startup has developed a new type of concrete additive that can absorb carbon dioxide gas in the air, and this concrete will also greatly reduce the demand for cement components.
The technology company called Carbon Cure said its cement will absorb carbon dioxide in the air while it is being stirred and locked in the concrete.
Once the concrete hardens, the carbon dioxide is permanently sealed in the concrete block. Even if the building is demolished after many years, the carbon dioxide stored in the concrete block will not disappear, because they have chemically reacted with the concrete to form special minerals.
"This mineral helps to increase the compressive strength of concrete," Carbon Cure Sustainability Director Christie Gamble said in an interview with foreign media: "Actually, carbon dioxide helps make concrete stronger, so concrete producers You can manufacture different hardness products according to your needs, and reduce the use of raw material cement in the production process. "
It is reported that Thomas Concrete, headquartered in Atlanta, USA, has been using Carbon Cure technology products since 2016. Thomas Concrete said that due to the use of Carbon Cure's new products, Thomas Concrete has prevented nearly 10 million pounds of carbon dioxide emissions from entering the atmosphere.
Justin Lazenby, technical operations manager of Thomas Concrete, said that the shift to more environmentally friendly technologies is a long-term decision that the building materials industry should accept. He said: "The entire industry is always trying to use yesterday's technology to solve today's problems, but those outdated technologies do not really solve the problems we face."
Carbon Cure is not the only company dedicated to making concrete more environmentally friendly, but it is one of the first companies to bring products to market. Carbicrete and Carbon Upcycling are two other start-up companies dedicated to improving the sustainability of concrete solutions.
Gregg Lewis, executive vice president of strategy at the National Ready-Mix Concrete Association, said these types of technologies will help drive the concrete industry toward a more sustainable future.
"It will provide a huge advantage for our entire building materials industry," he said. "If the entire building materials industry can reduce carbon emissions by 5% as a whole, that would be a huge number. If this technology is deployed globally, we can reduce about 700 megatons of carbon dioxide per year. This is equivalent to a reduction of 150 million vehicles per year. The car is the same. "
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