The invention discloses a method for maintaining porous concrete through
carbon dioxide. The method includes the following steps: (1) concrete is mixed and formed; (2) an obtained initial concrete body is placed into a pre-maintenance device for pre-maintenance, wherein the pre-maintenance temperature ranges from 15 DEG C to 25 DEG C, and the
relative humidity ranges from 50% to 70%; air circulates through an
air blower or a fan, wherein the pre-maintenance time ranges from 1 h to 18 h; (3) when the residual water-
cement ratio of the mixed material body obtained after pre-maintenance reaches a preset residual water-
cement ratio, the mixed material body is placed into a CO2 maintenance container, vacuumizing is carried out, then CO2 gas is led into the CO2 maintenance container for CO2 maintenance, the gas is discharged after maintenance is completed, and maintenance is stopped. By means of the method, control over the
moisture content of the concrete body can be achieved, the
carbon dioxide gas
absorption capacity of the concrete can be effectively improved, and the quality of a concrete product can be effectively improved; in addition, the waste
greenhouse effect gas, namely the
carbon dioxide gas can be effectively used, the emission of the
greenhouse gas can be reduced, the environment can be protected, and the
greenhouse effect can be suppressed.