| Summary: | Curing early age concrete (hereinafter referred to as EAC) with CO<sub>2</sub> as a new method for capturing and storing CO<sub>2</sub> can not only result in energy savings and emission reductions, but can also improve the performance of early age concrete and shorten the curing time, which leads to various application prospects. In this paper, we collect the existing research results at home and abroad to explain the reaction mechanisms of early age CO<sub>2</sub>-cured concrete (hereinafter referred to as EACC); summarize the effects of external factors such as carbonation time, CO<sub>2</sub> pressure and concentration, and intrinsic factors (such as the active admixture, the water/cement ratio, and the water content) on the carbonation effect of early age CO<sub>2</sub>; detail the existing theoretical and numerical models of EACC; investigate the technology of EACC in four fields, i.e., precast concrete, cast-in-place concrete, recycled concrete, and fibre-reinforced concrete; and summarize the problems faced by existing research in application.
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