Abstract
In order to predict the neutralization of concrete which is the reaction of carbonation dioxide from the outside and cement hydration product, such as calcium hydroxide and C–S–H, it was studied the numerical analysis method considering change of the pore structure and relative humidity during the neutralization reaction. Diffusion–reaction neutralization model was developed to predict the neutralization depth of concrete with coating finishing material. In order to build numerical analysis models considering outdoor environment and finishing materials, the adaption of proposed model was shown the results of existing outdoor exposure test results and accelerated carbonation test.
Highlights
In reinforced concrete structures, usually paint, finishing material, tile, mortar and other finishing material are used for the building’s appearance and style as well as for the protection of the building’s body
Depth of carbonation is in proportion to the square-root of age and it is used for prediction in the squareroot law (Durability of reinforced concrete, Kajima Technical Research Institute Version Section 1963; Toshio 1991) Even though the method with prediction of carbonation process in finishing material based on the square-root law is recommended (Baba and Senbu 1988), but application of the prediction based on the square-root law in two dimensional analysis into three dimensional objects is limited
Based on the review of the model as well as accelerated carbonation experiment results with finishing material, the sensitivity analysis was performed, the increase factor of carbon dioxide of each finishing material was measured and other necessary information were gathered. Based on these factors along with the accelerated carbonation experiment results and a ten-year outdoor exposure test result on the same material, this research draws the result of performed verification of applicability of the analytical model in relation to the outdoor exposure condition
Summary
Usually paint, finishing material, tile, mortar and other finishing material are used for the building’s appearance and style as well as for the protection of the building’s body. Depth of carbonation is in proportion to the square-root of age and it is used for prediction in the squareroot law (Durability of reinforced concrete, Kajima Technical Research Institute Version Section 1963; Toshio 1991) Even though the method with prediction of carbonation process in finishing material based on the square-root law is recommended (Baba and Senbu 1988), but application of the prediction based on the square-root law in two dimensional analysis into three dimensional objects is limited For this reason, a numerical analysis model based on a theory is required. Based on these factors along with the accelerated carbonation experiment results and a ten-year outdoor exposure test result on the same material, this research draws the result of performed verification of applicability of the analytical model in relation to the outdoor exposure condition
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