At this time are exposed a lot of building concrete problems due to durability and there are necessary apply a new methods to resolve them. The concrete and/or reinforcement can be attack it by the fluids and/or ions entrance from environment: chloride attack, sulfate attack, carbonation. From these reasons many experimental researches are made. Into this paper are presented the theoretical and experimental researches regarding carbonation process diffusion into ordinary concrete and high performance concrete samples exposed at different carbon dioxide level. In function of experimental researches was the depth carbonation formula suggested by C. Bob was added up. The concrete accelerated carbonation was made by medium accomplishment with big carbon dioxide level (until 25% for ordinary concrete and at 50% for high performance concrete). The d coefficient (concentration of CO2) from C. Bob formula was rounded. The spectrum of accelerated carbonation concrete is showed.