Abstract
Transportation of carbonate and sulfate ions in concrete under the drying‐wetting cycle environment is similar to the ingression and elimination of medicine in human body. Given this similarity, such a process is described dynamically using the classic compartment model in pharmacokinetics. The compartment model was applied to predict the content of carbonate and sulfate ions in different regions of concrete. Factors such as water‐cement ratio, salt category, carbonate‐ion and sulfate‐ion attack depth, and drying‐wetting cycle were synthetically considered in the compartment model. In conjunction with the prediction value of the compartment model, the experiment data uniformly distributed two sides of the model curve, and the difference is within the accepted range, thus verifying the reliability of the model prediction consequence. The compartment model in this article provides references for predicting the drying‐wetting varied cycles and ions attack depth of concrete under carbonate and sulfate ions attack.
Highlights
Compartment ModelWhere N means the number of experiment data, P means number of parameters in the selected model, and Re means residual sum of squares
Introduction e western region of JilinProvince is one of the three largest carbonate salinized soil regions worldwide and the largest carbonate salinized soil region in China. e salinized soil considerably damages the local concrete structures
The calculated parameter provides enhanced accuracy as Akaike’s Information Criterion (AIC) value is the least when different methods are selected to fit the curve for similar model. e compartment model can avoid overfitting effectively and limit the use of complex function
Summary
Where N means the number of experiment data, P means number of parameters in the selected model, and Re means residual sum of squares According to this certification, the calculated parameter provides enhanced accuracy as AIC value is the least when different methods are selected to fit the curve for similar model. To determine the number of compartment and divide concrete into different regions properly, the employment of analysis and consequence comparison of carbonate and sulfate ion content-concrete attack stages was necessary, followed by the calculation of AIC value. Drying-wetting cycle condition provides dynamic foundation for carbonate and sulfate ions ingression and elimination in concrete. Equation (10) presents the proposed two-compartment model that can describe the ion content in distinct regions of concrete at different attack ages
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