Permeability of some cement-based materials and usein the supercritical carbonization

The porosity and intrinsic permeability of the cement-based materials are significant parameters for the multiphysics coupling model for predicting the ions migration in the material. Based on the mass control equation, the super subcritical carbonation model of cement-based material, the liquid permeability, gas permeability and intrinsic permeability were detected by the steady-state method, and the porosity and water saturation were detected by the volumetric method using materials of mortar, concrete, cement tile and two kind cement slabs. The results showed that the orders of magnitude of intrinsic permeability of mortar and concrete were 0.001mD and 0.0001mD respectively, and the others were 0.01mD. Especially, the concrete intrinsic permeability was 9e-4mD and the porosity and the permeability would increase, when the material hadwood fiber component. Finally, some super subcritical carbonation tests were simulated using the values of the parameters obtained, and it was consistent with the test results of the carbonization depth.