Abstract
There are many reports on the durability of concrete structures affected by chloride-induced reinforcement corrosion in Japan. The penetration speed for chloride damage is evaluated using the chloride diffusion coefficient, which varies depending on mix proportion, cement type and admixture type. In general, the diffusion coefficient has been given as a function of the water-cement ratio or by experiment. An immersion experiment is usually carried out by soaking a specimen in salt water, but this method requires a long immersion period. On the other hand, electrophoresis examination can be carried out in a short period of time, but as this method is performed in the steady state the results may differ from the actual phenomenon. In this research, an evaluation method is proposed for the unsteady state by inducing chloride ion movement with electricity. This method calculates the diffusion coefficient in the unsteady state by measuring the penetration depth of the chloride ions up to the time when electricity supply was stopped, and various cement types were examined such as normal (N), early strength (H), low heat (L), blast-furnace slag cement type A (BA), type B (BB), type C (BC) and fly-ash cement type B (FB). Not only could the diffusion coefficient be calculated from the chloride ion depth, but this calculation could be carried out for periods as short as 24 hours. The variation in diffusion coefficient by cement type was also verified. Overall, it is believed that this method can calculated the chloride ion coefficient in the unsteady state in a short period of time.
| Original language | English |
|---|---|
| Title of host publication | Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013 |
| Publisher | Hokkaido University collection of Scholarly Academic Papers, HUSCAP |
| Publication status | Published - 2013 |
| Event | 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013 - Sapporo Duration: 2013 Sep 11 → 2013 Sep 13 |
Other
| Other | 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013 |
|---|---|
| City | Sapporo |
| Period | 13/9/11 → 13/9/13 |
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Keywords
- Accelerated chloride penetration test
- Cement type
- Chloride diffusion coefficient
- Depth of chloride ion
- Electrophoresis examination
ASJC Scopus subject areas
- Civil and Structural Engineering
- Building and Construction
Cite this
Study on the chloride diffusion coefficient calculated from a simple accelerated chloride penetration test using electricity. / Iyoda, Takeshi; Harasawa, Y.; Hosokawa, Y.
Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013. Hokkaido University collection of Scholarly Academic Papers, HUSCAP, 2013.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
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TY - GEN
T1 - Study on the chloride diffusion coefficient calculated from a simple accelerated chloride penetration test using electricity
AU - Iyoda, Takeshi
AU - Harasawa, Y.
AU - Hosokawa, Y.
PY - 2013
Y1 - 2013
N2 - There are many reports on the durability of concrete structures affected by chloride-induced reinforcement corrosion in Japan. The penetration speed for chloride damage is evaluated using the chloride diffusion coefficient, which varies depending on mix proportion, cement type and admixture type. In general, the diffusion coefficient has been given as a function of the water-cement ratio or by experiment. An immersion experiment is usually carried out by soaking a specimen in salt water, but this method requires a long immersion period. On the other hand, electrophoresis examination can be carried out in a short period of time, but as this method is performed in the steady state the results may differ from the actual phenomenon. In this research, an evaluation method is proposed for the unsteady state by inducing chloride ion movement with electricity. This method calculates the diffusion coefficient in the unsteady state by measuring the penetration depth of the chloride ions up to the time when electricity supply was stopped, and various cement types were examined such as normal (N), early strength (H), low heat (L), blast-furnace slag cement type A (BA), type B (BB), type C (BC) and fly-ash cement type B (FB). Not only could the diffusion coefficient be calculated from the chloride ion depth, but this calculation could be carried out for periods as short as 24 hours. The variation in diffusion coefficient by cement type was also verified. Overall, it is believed that this method can calculated the chloride ion coefficient in the unsteady state in a short period of time.
AB - There are many reports on the durability of concrete structures affected by chloride-induced reinforcement corrosion in Japan. The penetration speed for chloride damage is evaluated using the chloride diffusion coefficient, which varies depending on mix proportion, cement type and admixture type. In general, the diffusion coefficient has been given as a function of the water-cement ratio or by experiment. An immersion experiment is usually carried out by soaking a specimen in salt water, but this method requires a long immersion period. On the other hand, electrophoresis examination can be carried out in a short period of time, but as this method is performed in the steady state the results may differ from the actual phenomenon. In this research, an evaluation method is proposed for the unsteady state by inducing chloride ion movement with electricity. This method calculates the diffusion coefficient in the unsteady state by measuring the penetration depth of the chloride ions up to the time when electricity supply was stopped, and various cement types were examined such as normal (N), early strength (H), low heat (L), blast-furnace slag cement type A (BA), type B (BB), type C (BC) and fly-ash cement type B (FB). Not only could the diffusion coefficient be calculated from the chloride ion depth, but this calculation could be carried out for periods as short as 24 hours. The variation in diffusion coefficient by cement type was also verified. Overall, it is believed that this method can calculated the chloride ion coefficient in the unsteady state in a short period of time.
KW - Accelerated chloride penetration test
KW - Cement type
KW - Chloride diffusion coefficient
KW - Depth of chloride ion
KW - Electrophoresis examination
UR - http://www.scopus.com/inward/record.url?scp=84905269930&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84905269930&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84905269930
BT - Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013
PB - Hokkaido University collection of Scholarly Academic Papers, HUSCAP
ER -