Carbonation is the process which controlled by the carbon dioxide diffusion. 4.1.1. Details of model. The process of carbon dioxide diffusion in porous structural is known as a …

The conclusions on the analysis technique for carbonation behavior in concrete using neural network algorithm and carbonation modeling are as follows. 1) CO 2 diffusion coefficients are estimated through neural network algorithm with 3 components in OPC mixture design and relative humidity as neurons. For 12 data set of diffusion coefficients .

· A novel equivalent circuit model with R s (Q 1 (R ct1 W 1))(Q 2 (R ct2 W 2)) was proposed to describe the carbonation behavior in the cementitious materials, by taking into account the solid/liquid double-phase interaction. Good consistency with the experimental results was found in the model analysis. 3.

A kinetic model for the simultaneous Mg 2 + and Ca 2 + carbonation was developed.. The experimental results were used to validate and predict the kinetic parameters. • This model can predict the formation of Mg N Ca (1 − N) CO 3 and the average value for N.. A sensitivity analysis showed that presence of Mg 2 +, slowed the Ca 2 + precipitation.. Atmospheric CO 2 pressure is large enough to .

3. Probabilistic Analysis of Concrete Carbonation Depth . Carbonation is an important factor which affects rein-forced concrete structures durability. Deterministic evalu- ation of the carbonation factors does not account on the randomness of the input parameters of the model. Con-sequently, the reliable behavior of reinforcement steel

Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling Article in Cement and Concrete Research 40(1):119-127 · January 2010 with 45 Reads

· Read "Electrochemical impedance measurement and modeling analysis of the carbonation behavior for cementititous materials, Construction and Building Materials" on DeepDyve, the largest online rental service for scholarly research with thousands of …

the hyperbolic model of carbonation was formulated. Such a model describes the carbonation progress as the process unlimited in time but with the restricted range in concrete depth that is limited by the value of a model asymptote. Presented results cover research on carbonation

A reaction model was developed to predict kinetic parameters and competition of Mg 2+ and Ca 2+ ions during carbonation in mild conditions, i.e. ambient temperature and up to 3 atm for the CO 2 partial pressure. The experimental carbonation results at different temperatures, Mg 2+ /Ca 2+ ratios, and atmospheric pressure were used to validate and predict the kinetic parameters of individual .

Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling Article in Cement and Concrete Research 40(1):119-127 · January 2010 with 45 Reads

· Read "Electrochemical impedance measurement and modeling analysis of the carbonation behavior for cementititous materials, Construction and Building Materials" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Chemical Kinetic Modeling and Parameter Sensitivity Analysis for the Carbonation of Ca2+ and Mg2+ Under Ambient Conditions Article in Hydrometallurgy 167 · November 2016 with 34 Reads

retrospective analysis ranged from 10 to 60 years. The field data verified the validity of both . carbonation model used in this study is based on Fick’s first and second law of diffusion. Proposed in CEB [27] and modified further in Yoon et al [12], Equation 03 expresses carbonation depth as a .

A reaction-diffusion modeling of carbonation process in self-compacting concrete QhC T v C, S ,, , CC 1 (13) Where 1 is the influential factor of carbonation, and typically 1 0.8 ~1.0; vC is the

Electrochemical impedance measurement and modeling analysis of the carbonation behavior for cementititous materials Article in Construction and Building Materials 54:558-565 · March 2014 with 29 .

describe the carbonation, coupled with water and heat trans-fers on cracked structures. These authors showed the signifi-cant impact of the presence of cracks on carbonation penetra-tion: the carbonation depth can be locally tripled. Finally, the model of Miragliotta [26] takes into account the hydration and carbonation reactions of Ca(OH)2 and C-

· Read "Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling, Cement and Concrete Research" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.

Modeling of Carbonation based on Thermo-Hygro Physics with Strong . 2.2 Verification of the carbonation model and sensitivity analysis Verification of the existing model was carried out using

The carbonation process starts immediately when concrete is exposed to air. Carbon dioxide (CO 2) penetrates the concrete through the pores where it reacts with the calcium hydroxide and the moisture in the pores to form calcium carbonate.The carbon dioxide combines with the pore water to form a dilute carbolic acid which acts to reduce the concrete’s alkalinity.

The analysis model slightly overestimated the carbonation depths of Building 9, but a comparison with the carbonation depth calculated using and , which is the carbonation velocity coefficient estimation equation presented by the Korea Concrete Institute and the Japan Society of Civil Engineers, reveals that the accuracy of the analysis model .

Keywords: carbon dioxide, potassium carbonates, breakthrough curve, deactivation model . model and the deactivation model even though the carbonation mechanism of K2CO3 by CO2 and moisture [7] is very complicated. . Breakthrough Analysis for the Shrinking-core Model and the Homogeneous Model

Analysis of Carbonation Behavior in Concrete Using Neural Network Algorithm and Carbonation Modeling. Carbonation on concrete structures in underground sites or metropolitan cities is one of the major causes of steel corrosion in RC (Reinforced Concrete) structures.