Investigation of the Causes of Petrochemical Concrete Structures Destruction In Mahshahr and Proposed Solutions

  • Masoud Olapour Islamic Azad University, Ahvaz, Iran
  • Abdol Tangtakabi Shahid Chamran University of Ahvaz, Ahvaz, Iran
Keywords: concrete, water-cement ratio, cracks, corrosion, efflorescence

Abstract

Today, most civil structures are built of concrete, which’s use is increasing daily. Due to ignoring the principles of constructuion (for the durability of the concrete), corrosion causes substantial costs to the structures after a small period of operation that in some cases rebuilding the structure is even more difficient rather than renovating it. This issue is even more critical about the structure exposed to sea water and the low service life in the southern coastal structures has confirmed so. Also, with huge resources of gas and oil being discovered as well as the construction of large petrochemical plants in the Persian Gulf have led to the need for major construction and development projects in the area. Hot and humid climate and minerals in the region are showing signs of deterioration, including numerous cracks, corrosion, efflorescence and welting the concrete. Reinforced concrete structures in the south of the country are exposed to chemical or electrochemical damage. The most important corrosion factor is due to air carbonation phenomenon (occurs as a result of carbon dioxide in the air) and chloride penetration (which passes through the concrete and reaches the reinforcement). The effects of corrosion and cracking and collapse of concrete and concrete sulfate decrease the beneficial life of the structure significantly. This type of damage is greater in the tide region because due to wetting and drying, chloride penetration influx into concrete is intensified and as a result the corrosion rate increases. In order to reduce the damage of reinforced concrete structures different methods are used and most important is improving the quality of concrete. In this study the prevention cases of reinforcement corrosion have been investigated and the type of cement and its additives such as silica and penitron were oxamined. The results indicate that the coating material consisting of penitron penitron increases cylinder compressive strength. But the main benefit of penitron is preventing the concrete’s penetration. The best materials were selected by performing experiments and accordingly to the weather of Mahshahr, Samples of reinforced concrete structures with water-cement ratio of (w / c= 4% , w / c = 34%) and the lubricant of 6%- 2% range were built with a fixed slump, and taken under pressure tests. The results of the corrosion tests showed that he use of cement containing 10% silica with 34% water- cement ratio, armature FRP and penitron materials are the best technical and economic proposal in order to reduce corrosion in Mahshahr.

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Author Biographies

Masoud Olapour, Islamic Azad University, Ahvaz, Iran

Department of Civil Engineering, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

Abdol Tangtakabi, Shahid Chamran University of Ahvaz, Ahvaz, Iran

Department of Civil Engineering, Shahid Chamran University of Ahvaz, Ahvaz, Iran

References

American Standard and Testing of Material ASTM- G109. (1985).

Cabrera, J.G., & Nwaubani, S.O. (1980). The influence of High Temperrature on strength and pore structure of concrete Made with a Natural Pazzolan, concrete in hot climate.

Campbell, D. (1978). Concrete structures, Materials, Maintenance and repair.

Fukuyama, H., & Sugano, S. (2000). Seismic rehabilitation of Rc building " International Institute of Seismology and Earthquake Earthquake Engineering, Tatehara Ibaraki Japan Cement and Concrete Composites 22, 59-79.

Gent, U. (1999). Laboratory Soete for strength of Materials, corrosion Department,Report cocering the pull-out Test performed on Uncoated and coated Rebars.

Gonzalez, j A, Algaba, S, & Andrada, C. (1980). corrosion of reinforcig bars in carbonated concerte, Br corros j, Vol, 15, No 3.

Jong, W. (2003). Bai"seimic Retrofit for Reinforoced Concrete Building Structures"Conseqence Based Engineering (CEB)-Institute final Report-Texas university-Augus.

Kumar Mehta, P. (1986). concrete structure, properties and materials, prentice- Hall.

Lorenzis, L.D., & Nanni, A. (2001). Shear strengthening Of Reinforced concrete beams with near – surface mounted Fiber Reinforced Polymer Rods " ACI Structural Jornal Technical Paper January – February.

Mangat, P.S., & Khatib, J.M. (1995). Influence of Fly Ash, Silica Fume and slag sulfate Resistance of Concrete
Aci Materials Jornal/ September October.

Neville, A.M., & Brooks, J.J. (1987). Concrete technology, Longman scientific, Technical.

Pourbaix, M. (1974). Application of electrochemistry in corrosion science and in practice, corrosion science.

Ramazanianpoor, A.A., & Malhotra, V.M. (1995). effect of curing on the compressive strength, Resistance to Chloride Ion Penetration and porosity of concretes incorporating slag, Fly Ash or silica Fume, Cement & concrete composites Journal.

Regourd, M. (1975). The action of seawater on cements, Annales de L, Institut Technique du Batiment et des Travaux publics NO. 329.

Talib, A.Y., Rasheeduzzafar, A.S., & Al-Gahtani, A. (1986). Chloride binding and Corrosion in Silica Fume Concrete.

Teng, J.G., Chen, J.F., & Smith, S.T. (2002). FRP Strengthened Rc Structures"Published by Wiley.

Vassie, A. (1980). A survey of site tests for the assessment of corrosin in reinforced concrete.

Zhao, V. (2000). Use of composites for 21 st century civil infrastructure University of California, San Diego, La Jolla Ca Computer methods in applied mechanics and engineering 185, 433-454.
Published
2018-08-30
How to Cite
Olapour, M., & Tangtakabi, A. (2018). Investigation of the Causes of Petrochemical Concrete Structures Destruction In Mahshahr and Proposed Solutions. Amazonia Investiga, 7(15), 163-171. Retrieved from https://amazoniainvestiga.info/index.php/amazonia/article/view/435
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Articles