Modeling Of Carbonation Based On Thermo-hygro Physics With Strong Coupling Of Mass Transport And Equilibrium In Micro-pore Structure Of Concrete

摘要

A carbonation model based on thermo-hygro physics is presented in this paper.Reaction of C-S-H gel was newly added to the existing model as well as calcium hydroxide reaction,and a micro-pore structure model for carbonated concrete was improved by considering volume change and surface-area increase of hydrated products.The proposed model coupled with moisture equilibrium/transport gives reasonable predictions for carbonation progresses under low and high CO_2 concentrations in a unified manner.In addition,temperature dependent parameters were installed in the system.Although detailed mechanisms should be further investigated,the proposed methodology is able to simulate carbonation phe-nomena under various temperature conditions.