Mitsubishi Corp. has partnered with Blue Planet to promote the Californian startup’s CO2-reducing concrete across its global network.
What sets Blue Planet’s recycled concrete apart from traditional concrete is its technology, reports the Nikkei Asian Review; It has proven to reduce CO2 by about 100 kilograms per ton.
The tie-up with Blue Planet could also do Mitsubishi a lot good; it has been trying to develop technology for locking CO2 in concrete as part of a separate project with Japanese construction group Kajima and Chugoku Electric Power.
Concrete is usually made from pebbly aggregate mixed with cement.
What Blue Planet does different is produce aggregate using CO2 from factory emissions as an ingredient. Its technology does not require the energy-intensive step of purifying CO2 before use.
According to Blue Planet, the process starts by extracting calcium from unused or demolished concrete.
The resulting solution is then exposed to CO2 to form a limestone coating for rock particles.
This artificial aggregate, which can be used to make new concrete, contains the captured gas, reports The Nikkei.
Moreover a byproduct from this process is aggregate left over after the old concrete is recycled. This material too can be reused.
Blue Planet’s carbon capture aggregate was first used in concrete for a project at San Francisco International Airport in 2016.
The startup is now hoping to open a prototype factory with an annual production capacity of about 20,000 tons next year.
It aims to reach roughly 400,000 tons within two years afterward.
Image and content: Pixabay/Nikkei Asian Review