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Controlling chloride ions diffusion in concrete.

Zeng L, Song R - Sci Rep (2013)

Bottom Line: Indeed, this is a serious threaten for reinforced concrete structure, especially for the reinforced concrete structure in the sea.We formulated five kinds of concrete A, B, C, D and E, which are made of different proportion of cement, sand and glue, and fabricated six-layer (ABACAD) cylinder diffusion cloak and background media E.The simulation results show that the six-layer mass diffusion cloak can protect concrete against chloride ions penetration, while the experiment results show that the concentration gradients are parallel and equal outside the outer circle in the diffusion flux lines, the iso-concentration lines are parallel outside the outer circle, and the concentration gradients in the inner circle are smaller than those outside the outer circle.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory for Intelligent Agricultural Equipment, College of Engineering, Nanjing Agricultural University, Nanjing 210031, China.

ABSTRACT
The corrosion of steel in concrete is mainly due to the chemical reaction between the chloride ions and iron ions. Indeed, this is a serious threaten for reinforced concrete structure, especially for the reinforced concrete structure in the sea. So it is urgent and important to protect concrete against chloride ions corrosion. In this work, we report multilayer concrete can cloak chloride ions. We formulated five kinds of concrete A, B, C, D and E, which are made of different proportion of cement, sand and glue, and fabricated six-layer (ABACAD) cylinder diffusion cloak and background media E. The simulation results show that the six-layer mass diffusion cloak can protect concrete against chloride ions penetration, while the experiment results show that the concentration gradients are parallel and equal outside the outer circle in the diffusion flux lines, the iso-concentration lines are parallel outside the outer circle, and the concentration gradients in the inner circle are smaller than those outside the outer circle.

No MeSH data available.


Simulate steady state ten-layer diffusion cloak.(a) The surface and the iso-concentration lines. The left is large concentration, the right is small concentration. The vertical lines are the iso-concentration lines. (b) The horizontal lines are diffusion flux lines; the performance of ten-layer diffusion cloak is better than that of six-layer diffusion cloak.
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f3: Simulate steady state ten-layer diffusion cloak.(a) The surface and the iso-concentration lines. The left is large concentration, the right is small concentration. The vertical lines are the iso-concentration lines. (b) The horizontal lines are diffusion flux lines; the performance of ten-layer diffusion cloak is better than that of six-layer diffusion cloak.

Mentions: Fig. 3 shows the ten-layer (ABACADAEAF) diffusion cloak, Fig. 3a shows the surface and iso-concentration lines, Fig. 3b shows diffusion flux lines, the inner and outer radii of the ten-layer (ABACADAEAF) are (1, 1.317), (1.317, 2), (2, 2.271), (2.271, 3), (3, 3.236), (3.236, 4), (4, 4.208), (4.208, 5), (5, 5.186), (5.186, 6), respectively, and the diffusion coefficients of the six kinds of materials are DA = 4.000 × 10−8 cm2/s, DB = 0.253 × 10−8 cm2/s, DC = 0.478 × 10−8 cm2/s, DD = 0.650 × 10−8 cm2/s, DE = 0.766 × 10−8 cm2/s, DF = 0.855 × 10−8 cm2/s, respectively, the diffusion coefficients of the background media are DG = 1.000 × 10−8 cm2/s. The diffusion coefficient of the background media are DE = 1.000 × 10−8 cm2/s. Simulation results show that the more the layers, the better performance the mass diffusion cloak, and the small diffusion coefficient materials exclude diffusion flux lines and the large diffusion coefficient materials attract diffusion flux lines, just like small permittivity (permeability) material excludes electric (magnetic) field line and large permittivity (permeability) material attracts electric (magnetic) field line. It should be pointed out that the mass diffusion cloak mainly acts as a flux-guiding shell to suppress the influence of diffusion reflection.


Controlling chloride ions diffusion in concrete.

Zeng L, Song R - Sci Rep (2013)

Simulate steady state ten-layer diffusion cloak.(a) The surface and the iso-concentration lines. The left is large concentration, the right is small concentration. The vertical lines are the iso-concentration lines. (b) The horizontal lines are diffusion flux lines; the performance of ten-layer diffusion cloak is better than that of six-layer diffusion cloak.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3842543&req=5

f3: Simulate steady state ten-layer diffusion cloak.(a) The surface and the iso-concentration lines. The left is large concentration, the right is small concentration. The vertical lines are the iso-concentration lines. (b) The horizontal lines are diffusion flux lines; the performance of ten-layer diffusion cloak is better than that of six-layer diffusion cloak.
Mentions: Fig. 3 shows the ten-layer (ABACADAEAF) diffusion cloak, Fig. 3a shows the surface and iso-concentration lines, Fig. 3b shows diffusion flux lines, the inner and outer radii of the ten-layer (ABACADAEAF) are (1, 1.317), (1.317, 2), (2, 2.271), (2.271, 3), (3, 3.236), (3.236, 4), (4, 4.208), (4.208, 5), (5, 5.186), (5.186, 6), respectively, and the diffusion coefficients of the six kinds of materials are DA = 4.000 × 10−8 cm2/s, DB = 0.253 × 10−8 cm2/s, DC = 0.478 × 10−8 cm2/s, DD = 0.650 × 10−8 cm2/s, DE = 0.766 × 10−8 cm2/s, DF = 0.855 × 10−8 cm2/s, respectively, the diffusion coefficients of the background media are DG = 1.000 × 10−8 cm2/s. The diffusion coefficient of the background media are DE = 1.000 × 10−8 cm2/s. Simulation results show that the more the layers, the better performance the mass diffusion cloak, and the small diffusion coefficient materials exclude diffusion flux lines and the large diffusion coefficient materials attract diffusion flux lines, just like small permittivity (permeability) material excludes electric (magnetic) field line and large permittivity (permeability) material attracts electric (magnetic) field line. It should be pointed out that the mass diffusion cloak mainly acts as a flux-guiding shell to suppress the influence of diffusion reflection.

Bottom Line: Indeed, this is a serious threaten for reinforced concrete structure, especially for the reinforced concrete structure in the sea.We formulated five kinds of concrete A, B, C, D and E, which are made of different proportion of cement, sand and glue, and fabricated six-layer (ABACAD) cylinder diffusion cloak and background media E.The simulation results show that the six-layer mass diffusion cloak can protect concrete against chloride ions penetration, while the experiment results show that the concentration gradients are parallel and equal outside the outer circle in the diffusion flux lines, the iso-concentration lines are parallel outside the outer circle, and the concentration gradients in the inner circle are smaller than those outside the outer circle.

View Article: PubMed Central - PubMed

Affiliation: Jiangsu Key Laboratory for Intelligent Agricultural Equipment, College of Engineering, Nanjing Agricultural University, Nanjing 210031, China.

ABSTRACT
The corrosion of steel in concrete is mainly due to the chemical reaction between the chloride ions and iron ions. Indeed, this is a serious threaten for reinforced concrete structure, especially for the reinforced concrete structure in the sea. So it is urgent and important to protect concrete against chloride ions corrosion. In this work, we report multilayer concrete can cloak chloride ions. We formulated five kinds of concrete A, B, C, D and E, which are made of different proportion of cement, sand and glue, and fabricated six-layer (ABACAD) cylinder diffusion cloak and background media E. The simulation results show that the six-layer mass diffusion cloak can protect concrete against chloride ions penetration, while the experiment results show that the concentration gradients are parallel and equal outside the outer circle in the diffusion flux lines, the iso-concentration lines are parallel outside the outer circle, and the concentration gradients in the inner circle are smaller than those outside the outer circle.

No MeSH data available.