“Ready Mixed” refers to concrete that is batched for delivery from a central plant instead of being mixed on the job site. Each batch of ready-mixed concrete is tailor-made according to the specifics and is delivered to the site in a malleable condition, usually in the cylindrical trucks often known as “concrete mixers.” Concrete is not the same as cement, which is just one component of concrete along with water, aggregates such as rock, sand or gravel and various admixtures that can enhance both the sustainability and other characteristics of concrete. New aggregates are being produced that absorb enough Carbon Dioxide to create a carbon negative material. In other words, the option to create concrete that serves as a carbon sink, permanently storing anthropogenic carbon in the hardened product. It is important to note that with the implementation of these technologies at scale, coupled with the use of supplemental cementitious materials (SCMs) such as slag and fly ash cement, a more widespread use of concrete can drive down the total of carbon dioxide emitted into the atmosphere from other sources including logging, deforestation, and the manufacture and long distance transportation of other building products.
Climate Positive Concrete is achieved by integrating a variety of innovations and tools to sequestering carbon and utilizing it to improve climate conditions with building materials. Exposed concrete in buildings absorbs atmospheric carbon through a process commonly referred to as recarbonation or carbon uptake. This naturally occurring process locks the carbon into the concrete permanently. Concrete offers architects practicing today and the next generation of architects the chance to select a building material that moves beyond zero embodied carbon. Concrete offers a critical path toward climate stability because of its inherent carbon storage properties.