Constitution of Green Rust and Its Significance to the Corrosion of Steel in Portland Cement

CORROSION ◽  
1993 ◽  
Vol 49 (6) ◽  
pp. 457-463 ◽  
Author(s):  
K. K. Sagoe-Crentsil ◽  
F. P. Glasser
Keyword(s):  
Portland Cement ◽  
Green Rust ◽  
Corrosion Of Steel

Prediction of the Carbonation Depth of Concrete with a Mortar Finish

2008 ◽  
Vol 385-387 ◽  
pp. 633-636 ◽  
Author(s):  
Han Seung Lee ◽  
Xiao Yong Wang
Keyword(s):  
Portland Cement ◽  
Numerical Procedure ◽  
Pozzolanic Reaction ◽  
Surface Coatings ◽  
Reinforced Concrete Structures ◽  
Hydration Products ◽  
Application Time ◽  
Carbonation Depth ◽  
Hydration Model ◽  
Corrosion Of Steel

It is well known that carbonation will result corrosion of steel reinforcement in reinforced concrete structures. To reduce the rate of carbonation, the surface coatings, such as mortar finish, has been used widely to concrete. This paper presents a numerical procedure about carbonation of the coating-concrete system. This numerical procedure starts with a multi-component hydration model. By hydration model which considers both and Portland cement and pozzolanic reaction, the amount of hydration products which are susceptible to carbonate as well as porosity is obtained as function of age. Furthermore, the diffusivity of CO2 is determined and carbonation depth of concrete is predicted. Parameter studies are performed to show the influence of composition and application time of mortar finish on carbonation depth of substrate concrete.

Formation of the Fe(II)–Fe(III) hydroxysulphate green rust during marine corrosion of steel

2003 ◽  
Vol 45 (4) ◽  
pp. 833-845 ◽  
Author(s):  
Ph Refait ◽  
J.-B Memet ◽  
C Bon ◽  
R Sabot ◽  
J.-M.R Génin
Keyword(s):  
Green Rust ◽  
Marine Corrosion ◽  
Corrosion Of Steel

The simultaneous presence of green rust 2 and sulfate reducing bacteria in the corrosion of steel sheet piles in a harbour area

1992 ◽  
Vol 69 (1-4) ◽  
pp. 875-878 ◽  
Author(s):  
J. -M. R. Génin ◽  
A. A. Olowe ◽  
N. D. Benbouzid-Rollet ◽  
D. Prieur ◽  
M. Confente ◽  
...  
Keyword(s):  
Steel Sheet ◽  
Sulfate Reducing Bacteria ◽  
Green Rust ◽  
Simultaneous Presence ◽  
Sulfate Reducing ◽  
Corrosion Of Steel ◽  
Reducing Bacteria ◽  
Harbour Area

Products obtained by microbially-induced corrosion of steel in a marine environment: Role of green rust two

1994 ◽  
Vol 93 (1) ◽  
pp. 1807-1812 ◽  
Author(s):  
J. -M. R. Génin ◽  
A. A. Olowe ◽  
B. Resiak ◽  
M. Confente ◽  
N. Rollet-Benbouzid ◽  
...  
Keyword(s):  
Marine Environment ◽  
Green Rust ◽  
Microbially Induced Corrosion ◽  
Corrosion Of Steel

Chloride Ion Diffusion of Phosphoaluminate Cement Concrete

2009 ◽  
Vol 79-82 ◽  
pp. 99-102 ◽  
Author(s):  
Zhu Ding ◽  
Feng Xing ◽  
Ming Zhang ◽  
Peng Liu
Keyword(s):  
Portland Cement ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Hydration Products ◽  
Portland Cement Concrete ◽  
Ion Diffusion ◽  
Cement Concrete ◽  
Dense Microstructure ◽  
Corrosion Of Steel ◽  
Chloride Ion Diffusion

Penetration and diffusion of chloride ions in concrete can lead to the corrosion of steel bar and shorten the service life of concrete structures. Phosphoaluminate cement (PAC) is a new cementitious material which has many special properties compared to Portland cement (PC). In the study, chloride ion diffusion in PAC concrete was tested with RCM method. The phase composition and morphology of hydration products, pore volume of hardened paste cured for 28d were analyzed with X-ray diffraction (XRD) and mercury intrusion porosimetry (MIP). The results show that chloride ion diffusion coefficient of PAC concrete is much lower than that of Portland cement concrete under the same test conditions. The hydration products of PAC are main micro-crystalline phase and gel of phosphate and/or phophoaluminate, which formed a dense microstructure. There is no calcium hydroxide produced in the PAC hydration system. In hardened PAC paste, chloride ions might replace the atom group [OH] - and [PO4]3- of hydrates and become stable compounds. The resistance to chloride ion diffusion of PAC concrete will increase with the hydration age, because its microstructure becomes denser with the hydration age increasing.

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