Relationship between coulomb and migration coefficient of chloride ions for concrete in a steady-state chloride migration test

2001 ◽  
Vol 53 (1) ◽  
pp. 13-24 ◽  
Author(s):  
T. Sugiyama ◽  
Y. Tsuji ◽  
T. W. Bremner
Keyword(s):  
Steady State ◽  
Chloride Ions ◽  
Migration Test ◽  
Chloride Migration ◽  
And Migration

scholarly journals Autogenous Healing of Cracked Mortar Using Modified Steady-State Migration Test against Chloride Penetration

2021 ◽  
Vol 13 (17) ◽  
pp. 9519
Author(s):  
Fahad ul Rehman Abro ◽  
Abdul Salam Buller ◽  
Tariq Ali ◽  
Zain Ul-Abdin ◽  
Zaheer Ahmed ◽  
...  
Keyword(s):  
Steady State ◽  
Chloride Ions ◽  
Test Method ◽  
The Self ◽  
Chloride Ingress ◽  
Self Healing ◽  
Migration Test ◽  
Steady State Condition ◽  
Chloride Migration ◽  
Short Period

Concrete is a popular building material all over the world, but because of different physiochemical processes, it is susceptible to crack development. One of the primary deterioration processes of reinforced concrete buildings is corrosion of steel bars within the concrete through these cracks. In this regard, a self-healing technique for crack repair would be the best solution to reduce the penetration of chloride ions inside concrete mass. In this study, a rapid chloride migration (RCM) test was conducted to determine the self-healing capacity of cracked mortar. With the help of the RCM test, the steady-state migration coefficient of cracked and uncracked specimens incorporating expansive and crystalline admixtures was calculated. Based on the rate of change of the chloride ion concentrations in the steady-state condition, the migration coefficient was calculated. Furthermore, bulk electrical conductivity tests were also conducted before and after the migration test to understand the self-healing behavior. It was evident from the test results that the self-healing of cracks was helpful to reduce the penetration of chloride ions and that it enhanced the ability of cracked mortar to restrict the chloride ingress. Using this test method, the self-healing capacity of the new self-healing technologies can be evaluated. The RCM test can be an acceptable technique to assess the self-healing ability of cement-based materials in a very short period, and the self-healing capacity can be characterized in terms of the decrease of chloride migration coefficients.

scholarly journals Using the Steady-State Chloride Migration Test to Evaluate the Self-Healing Capacity of Cracked Mortars Containing Crystalline, Expansive, and Swelling Admixtures

Materials ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 1865 ◽  
Author(s):  
Fahad ul Rehman Abro ◽  
Abdul Salam Buller ◽  
Kwang-Myong Lee ◽  
Seung Yup Jang
Keyword(s):  
Steady State ◽  
Diffusion Coefficients ◽  
Chloride Ions ◽  
Test Method ◽  
The Self ◽  
Self Healing ◽  
Migration Test ◽  
Stage Of Development ◽  
Chloride Migration ◽  
Cement Based Materials

Interest in self-healing-crack technologies for cement-based materials has been growing, but research into such materials remains in the early stage of development and standardized methods for evaluating healing capacity have not yet been established. Therefore, this study proposes a test method to evaluate the self-healing capacity of cement-based materials in terms of their resistance to chloride penetration. For this purpose, the steady-state chloride migration test has been used to measure the diffusion coefficients of cracked mortar specimens containing crystalline, expansive, and swelling admixtures. The results of the present study show that the time to reach a quasi-steady-state decreased and the diffusion coefficients increased as the potential increased because of the potential drop inside the migration cell and self-healing that occurred during the test. Therefore, use of a high potential is recommended to minimize the test duration, as long as the temperature does not rise too much during the test. Using this test method, the self-healing capacity of the new self-healing technologies can be evaluated, and an index of self-healing capacity is proposed based on the rate of charged chloride ions passing through a crack.

Application of the Steady-State Chloride Migration Test for Evaluating Chloride Ingress into Fly Ash Concrete.

2002 ◽  
pp. 191-203 ◽  
Author(s):  
Takafumi SUGIYAMA ◽  
Sorn VIRA ◽  
Yukikazu TSUJI ◽  
Takeshi OSHIRO
Keyword(s):  
Steady State ◽  
Fly Ash ◽  
Chloride Ingress ◽  
Migration Test ◽  
Fly Ash Concrete ◽  
Chloride Migration

Chloride Binding of Self-Compacting Concrete with Different Crack Depths under Electric Migration Test

2011 ◽  
Vol 105-107 ◽  
pp. 957-960
Author(s):  
Song Mu ◽  
Bao Guo Ma ◽  
Geert de Schutter ◽  
Shou Wei Jian
Keyword(s):  
Crack Depth ◽  
Chloride Content ◽  
Chloride Ions ◽  
Test Method ◽  
Cement Matrix ◽  
Chloride Binding ◽  
Migration Test ◽  
Cracked Concrete ◽  
Chloride Migration ◽  
Binding Isotherms

Cracks can form a shortcut for transport of chloride ions in concrete structure, and provide more opportunities for chloride ions to contact and bind with cement matrix. Following the NT BUILD 492 chloride migration test method, chloride content were determined on cracked concrete samples which were prepared by artificial crack method. The results shows crack depth increased from 0 mm to 31.4 mm almost did not exert pronounced effects on chloride binding of concrete under the migration test.Besides, the binding parameter of linear binding isotherms almost did not change.

Non-steady state migration of chloride ions in cement pastes at early age

RSC Advances ◽  
2014 ◽  
Vol 4 (89) ◽  
pp. 48582-48589 ◽  
Author(s):  
S. W. Tang ◽  
Z. J. Li ◽  
E. Chen ◽  
H. Y. Shao
Keyword(s):  
Porous Media ◽  
Steady State ◽  
Network Simulation ◽  
Chloride Ions ◽  
Early Age ◽  
Ion Diffusion ◽  
Ion Migration ◽  
Cement Pastes ◽  
And Migration ◽  
Fractal Network

We have theoretically determined ion diffusion and migration coefficients in fractal porous media. These coefficients of fractal cement pastes have been experimentally determined by ERIM and NCIM. An innovative fractal network simulation for ion migration in fractal porous media has been established.

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