>One potential drawback, though, is that since the CO2 absorption is a critical part of the process and must be done in a special chamber, CarbiCrete can only be used in pre-cast form; it can’t be put in a mixer truck and poured on-site at a construction location.<p>So, it is not a replacement for concrete, it is a replacement for concrete blocks (or other - presumably small sized - pre-cast elements), and anyway the needed 24 h curing in a "special chamber" is - unless they really have some other methods - a show-stopper from both cost and production volume viewpoints.