Studies on forecasting of carbonation depth of slag high performance concrete considering gas permeability

•Introduce the carbonation speed coefficient decided by gas permeability.•Establish prediction model of DtS considering concrete gas permeability coefficient.•The influence of gas permeability on slag HPC carbonation depth is studied.•The change rule of carbonation depth with the slag dosage was investigated.•We found that carbonization reaction resultant makes concrete compact gradually.

The carbonization resistance ability of concrete is a very important index of durability. Based on the standard specimen test, the relationship between the gas permeability of slag high performance concrete and the carbonation depth is studied, and the law of influence on carbonation depth of slag high performance concrete by the gas permeability is concluded. The carbonation speed coefficient decided by gas permeability and the influence coefficient of the actual environment condition are introduced on the basis of carbonization theoretical model, and the prediction model of carbonation depth of slag high performance concrete is proposed. It proves that the model has a good accuracy through the experiment.