| Title |
A Study on Prediction Model of Carbonation Progress Rate of Mortar by Incorporation of Steel Powder |
| Authors |
Kim Jeong-Jin ; Park Dong-Cheon |
| Keywords |
Carbonation ; Steel Powder ; Pore Solution ; Corrosion of Reinforcement ; Accelerated Carbonation Test ; Diffusion Coefficient |
| Abstract |
In this study the prediction model of carbonation progress rate of concrete using steel powder as an addition is developed, in which the reduction of not only the diffusion rate of CO2 but also the amount of Ca(OH)2 by replenishment of pore by corrosion products. The model is based on the diffusions of CO2 and its reaction with Ca(OH)2, and considers the coexistence of CaCO3 with Ca(OH)2 in carbonation progression region. The model can also explain the characteristics of carbonation resistance of concrete that the matrix is densified due to carbonatoin. The prediction by the model agreed well the experimental data in which the concrete using steel powder, and it showed the higher rate at corbonation in early age and the lower rate in long-term age than the concrete without steel powder. Consequently the model can predict the rate of carbonation of concrete exposed in the atmosphere regardless of the water-to-cement raito, the amount of the content of steel powder, etc. |