Abstract: Usingthe Nanjing Weisan Road river-crossing tunnel as an example, a durability test of reinforced concrete segments was carried out considering the effects of different mineral additive parameters, with the results showing that:1) the carbonation depth increases with an increase of carbonization age under the same water/cement ratio, for which the increment speed at each age is slow and the total carbonation depth is small; 2) the carbonation depth increases with an increase of the water/cement ratio under the same additive amount; 3) the carbonation depth increases with an increased additive amount under the same water/cement ratio when both fly ash and mineral powder are added; and 4) the carbonation depth increases with an increase of fly ash and a decrease of mineral powder under the same additive amount and water/cement ratio when both fly ash and mineral powder are added.