Bendable concrete and other CO2-infused cement mixes could dramatically cut global emissions
One of the big contributors to climate change is right beneath your feet, and transforming it could be a powerful solution for keeping greenhouse gases out of the atmosphere.
The production of cement, the binding element in concrete, accounted for 7% of total global carbon dioxide emissions in 2018. Concrete is one of the most-used resources on Earth, with an estimated 26 billion tons produced annually worldwide. That production isn’t expected to slow down for at least two more decades.
Given the scale of the industry and its greenhouse gas emissions, technologies that can re-invent concrete could have profound impacts on climate change.
As engineers working on issues involving infrastructure and construction, we have been designing the next generation of concrete technology that can reduce infrastructure’s carbon footprint and increase durability. That includes CO2-infused concrete that locks up the greenhouse gas and can be stronger and even bendable.
The industry is ripe for dramatic change, particularly with the Biden administration promising to invest big in infrastructure projects and cut US emissions at the same time. However, to put CO2 to work in concrete on a wide scale in a way that drastically cuts emissions, all of its related emissions must be taken into account.
Concrete is made up of aggregate materials -- primarily rocks and sand -- along with cement and water.
Because about 80% of concrete’s carbon footprint comes from cement, researchers have been working to find substitute materials.
Industrial byproducts such as iron slag and coal fly ash are now frequently used to reduce the amount of cement needed. The resulting concrete can have significantly lower emissions because of that change. Alternative binders, such as limestone calcined clay, can also reduce cement use. One study found that using limestone and calcinated clay could reduce emissions by at least 20% while also cutting production costs.
Apart from developing blended cements, researchers and companies are focusing on ways to use captured CO2 as an ingredient in the concrete itself, locking it away and preventing it from entering the atmosphere. CO2 can be added in the form of aggregates -- or injected during mixing. Carbonation curing, also known as CO2 curing, can also be used after concrete has been cast.
These processes turn CO2 from a gas to a mineral, creating solid carbonates that may also improve the strength of concrete. That means structures may need less cement, reducing the amount of related emissions. Companies such as CarbonCure and Solidia have developed technologies to use these processes for concrete poured at construction sites and in precast concrete, such as cinder blocks and other construction materials.
At the University of Michigan, we are working on composites that produce a bendable concrete material that allows thinner, less brittle structures that require less steel reinforcement, further reducing related carbon emissions. The material can be engineered to maximize the amount of CO2 it can store by using smaller particles that readily react with CO2, turning it to mineral.
The CO2-based bendable concrete can be used for general buildings, water and energy infrastructure, as well as transportation infrastructure. Bendable concrete was used in Kitahama tower in Osaka, Japan, and roadway bridge slabs in Ypsilanti, Michigan.
Merging infrastructure and climate policy
In 2020, a wide range of companies announced steps to reduce their emissions. However, government investment and procurement policies are still needed to transform the construction industry.
“Low embodied carbon concrete” rules and projects to reduce the amount of cement in concrete have cropped up around the country, including in Marin County, California; Hastings-on-Hudson, New York; and a sidewalk pilot in Portland, Oregon. In New York and New Jersey, lawmakers have proposed state-level policies that would provide price discounts in the bidding process to proposals with the lowest emissions from concrete. These policies could serve as a blueprint for reducing carbon emissions from concrete production and other building materials.
Lucca Henrion is Research Fellow at the Global CO2 Initiative, University of Michigan. Duo Zhang is Assistant Research Scientist, University of Michigan. Victor C Li is James R Rice Distinguished University Professor of Engineering, University of Michigan. Volker Sick is Arthur F Thurnau is Professor; DTE Energy Professor of Advanced Energy Research; and Director, Global CO2 Initiative, University of Michigan. A version of this article previously appeared on The Conversation and has been reprinted by special arrangement.