Some concrete manufacturers are tinkering with their mixes to reduce their need for cement, which is a main component of concrete. U.S. Concrete, for example, has low-CO2 mixes, one of which uses fly ash to replace up to 50% of the required cement.
Cement is often called “the glue” that holds concrete together. However, according to the Portland Cement Association, concrete can absorb CO2, making cement and concrete a “carbon sink” that could eventually negate the effects of pumping so much of the gas into the air during the production phase.
