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PCT (Power Cable Tunnel) and UT (Utility Tunnel) are important non-transport infrastructures installed underground to accommodate electricity, gas, water, telecommunications and sewerage facilities in... the basement. Most of the PCT and UT are reinforced concrete structures, and the deterioration is intensified due to the increase in duration of use. As a result, the repair and reinforcement costs have increased rapidly, which leads to difficulties in maintenance. In general, carbonation of concrete is known to be a major cause of durability deterioration for PCT and UT. The rate of carbonation should be predicted using a reliable model that considers the materials and mix proportions of concrete and the environmental conditions under which the structure is in service. However, there is insufficient of data on that, and it is difficult to accurately present carbonation prediction models for each structure.
In this study, the carbonation rate of PCT and UT was analyzed for the CDF (Cumulative Distribution Function) of 50% to 95% through probability analysis, and the approximate carbonation rate of PCT and UT operated in Korea was presented. Probability analysis on the carbonation by region of PCT and UT shows that the carbonation rate coefficients at CDF 50% are in the range of 0.249 ～ 2.195mm/√year and 1.000 ～ 3.233mm/√year, respectively. Therefore, there is a significant difference in carbonation rate by region and structure. The results of analysis can be used to predict the progress of carbonation by year of use and can be applied to plan the preventive maintenance for structures.続きを見る
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