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عنوان
Criteria for cathodic protection of steel in concrete in the context of Arabian Gulf environment

پدید آورنده
M. G. Ali

موضوع
Applied sciences,Civil engineering

رده

کتابخانه
کتابخانه مطالعات اسلامی به زبان های اروپایی

محل استقرار
استان: قم ـ شهر: قم

کتابخانه مطالعات اسلامی به زبان های اروپایی

تماس با کتابخانه : 32910706-025

TLpq303982691

انگلیسی

Criteria for cathodic protection of steel in concrete in the context of Arabian Gulf environment
[Thesis]
M. G. Ali

King Fahd University of Petroleum and Minerals (Saudi Arabia)
1991

308

Ph.D.
King Fahd University of Petroleum and Minerals (Saudi Arabia)
1991

This study attempts to formulate and quantify various relevant considerations which influence the effective cathodic protection of corroding reinforcing steel in concrete structures in the Gulf environment. The parameters included in the research program are: chloride content, temperature, reactive aggregates, depth of reinforcement in a two mat system and secondary effects. It was found that the instant off, shift and decay potentials as well as the current density needed for adequate protection of steel are dependent on the chloride gradient as well as the chloride content in concrete. A 60C exposure required only about 20 percent higher level of protection in terms of current density/instant off potential/decay potential for an initial polarization period of two months. Enhanced activation in the initial period reduces the corrosion activity subsequently due to the beneficial electromigration of ions requiring a reduced protection on a long term basis. The decay potential criterion was found to be least sensitive to chloride content, chloride gradient and temperature effect, although it does not explicitly indicate the level of protection current which is automatically adjusted to accommodate the various factors influencing corrosion activity. In a two mat reinforcement system, the top mat was significantly overprotected when the bottom mat was just adequately protected from the anode source located above the top mat. The top mat suffers overprotection to an extent which would cause an unacceptable 30 percent reduction in the steel-concrete bond in a period of about 8 years. However, the bond reduction for a practical cathodic protection current density of 1-3 ma/ft2 was found to be negligible. In high alkali-cement concrete containing reactive aggregates, cathodic protection current significantly advances the cracking time and softens the mortar at the steel-concrete interface reducing compressive strength and hardness.

Applied sciences
Civil engineering

M. G. Ali

 مطالعه متن کتاب 

p

[Thesis]
276903

a
Y

الاقتراح / اعلان الخلل

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