改良RCM模型評估混凝土擴散係數

USING MODIFIED RCM TO DETERMINE THE DIFFUSION COEFFICIENT IN CONCRETE

黃康訓(Kang-Shiun Huang) ； 楊仲家(Chung-Chia Yang)

《中國土木水利工程學刊》 32卷4期 (2020/06) Pp. 321-327

https://doi.org/10.6652/JoCICHE.202006_32(4).0002

摘要

為有效地評估海洋鹽害環境下之混凝土擴散係數，本研究分析NT Build 492 Rapid Chloride Migration test （RCM）試驗與貯鹽試驗之關係。另一方面，由於RCM試驗在比色法與理論模型存有些問題，試驗結果有較大之變異係數，因此本研究利用兩片法，繪製實際氯離子曲線圖，比較傳統理論模型與實際氯離子分布差異，更進一步提出新非穩態傳輸模型。改良RCM模型結果顯示：非穩態傳輸係數與擴散係數呈良好線性關係。

關鍵字

貯鹽試驗 ； 快速氯離子傳輸試驗 ； 氯離子分布曲線

並列摘要

This study analyzes the relationship between NT Build 492 Rapid Chloride Migration test (RCM) and salt ponding test to assess the concrete diffusion coefficient in marine environment. In addition, NT Build 492 RCM has some problems in colorimetric method and theoretic model. The experimental results have a high coefficient of variation. Therefore, the two-sample method is used to determine the actual chloride profile. Comparing the RCM and chloride profile after RCM, it shows the difference between the traditional theoretic model and actual chloride profile. Therefore, the new migration model is developed in this study. The result of modified RCM model shows a good linear relationship existed between migration coefficient and diffusion coefficient.

並列關鍵字

salt ponding test ； RCM ； chloride profile

參考文獻

Aitcin, P. C.,Adam, N.(1993).High performance concrete demystified.ACI. Journal: Concrete International.15(1),21-26.

Liu, Y. C.(2011).Chloride transport behavior in fly ash concrete.National Taiwan Ocean University.

Lin, Y. J.(2018).Using the RCPT and RCM to determine the chloride non-steady-state migration in concrete.National Taiwan Ocean University.

Chancey, R. T.,Stutzman, P.,Juenger, M. C. G.,Fowler, D. W.(2010).Comprehensive phase characterization of crystalline and amorphous of a class F fly ash.Cement and Concrete Research.40(1),146-156.

Siddique, R.(2004).Performance characteristics of high-volume Class F fly ash concrete.Cement and Concrete Research.34(3),487-493.