NATURAL CORROSION INHIBITORS FOR STEEL REINFORCEMENT IN CONCRETE — A REVIEW

2015 ◽  
Vol 22 (03) ◽  
pp. 1550040 ◽  
Author(s):  
PANDIAN BOTHI RAJA ◽  
SEYEDMOJTABA GHOREISHIAMIRI ◽  
MOHAMMAD ISMAIL
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Inhibitors ◽  
Construction Materials ◽  
Steel Corrosion ◽  
Vital Role ◽  
Prevention Measures ◽  
Main Culprit ◽  
Chloride Attack ◽  
Reinforced Steel ◽  
Metal Protection

Reinforced concrete is one of the widely used construction materials for bridges, buildings, platforms and tunnels. Though reinforced concrete is capable of withstanding a large range of severe environments including marine, industrial and alpine conditions, there are still a large number of failures in concrete structures for many reasons. Either carbonation or chloride attack is the main culprit which is due to depassivation of reinforced steel and subsequently leads to rapid steel corrosion. Among many corrosion prevention measures, application of corrosion inhibitors play a vital role in metal protection. Numerous range of corrosion inhibitors were reported for concrete protection that were also used commercially in industries. This review summarizes the application of natural products as corrosion inhibitors for concrete protection and also scrutinizes various factors influencing its applicability.

scholarly journals Experimental Comparability Among Different Accelerated Reinforced Steel Concrete Corrosion Methods

2018 ◽  
Vol 7 (4.20) ◽  
pp. 209
Author(s):  
Mushtaq Sadiq Radhi ◽  
Maan S. Hassan ◽  
Iqbal N. Gorgis
Keyword(s):  
Reinforced Concrete ◽  
Steel Corrosion ◽  
Corrosion Current ◽  
Steel Reinforcement ◽  
Small Scale ◽  
Accelerated Corrosion ◽  
Galvanostatic Method ◽  
Reinforced Steel ◽  
Impressed Current ◽  
Corrosion Of Steel

The objective of this paper is to inspect the effect of changing the density of the impressed current and wetting-drying condition on accelerated corrosion of reinforced concrete specimens by a galvanostatic method.  Small-scale reinforced concrete columns were prepared and then artificially corroded by different setups of accelerated corrosion under an impressed current and also under different wetting-drying cycles for comparison. The density of the impressed current ranged between 50 and 500 µA/cm2 with different wetting-drying cycles periods. Corrosion current, and cracking were monitored throughout the accelerated corrosion period to determine the level of damage caused by the development of expansive reinforcement steel corrosion products, appearance of the first crack, and pattern of cracking.The results indicated that the galvanostatic method with wetting-drying sequences can be utilized effectively to simulate the normal corrosion of steel reinforcement in the concrete structure. The usage of different intensities of the current has no influence on the crack pattern. Though, increasing the current level leads to a substantial increase in the crack width due to corrosion of the steel reinforcement in a shorter time.  

scholarly journals CORRELATION BETWEEN THE INSPECTION MANUAL SEVERITY CODES AND MOMENT COEFFICIENT FOR DETERIORATED CONCRETE BEAMS

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Fin O'Flaherty
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Construction Materials ◽  
Steel Corrosion ◽  
High Standard ◽  
Concrete Bridges ◽  
Reinforced Concrete Beams ◽  
Moment Coefficient ◽  
The Uk ◽  
Loss Of Strength

Bridges form a vital part of any countries transport network. Roads users expect that these structures remain safely in-service day after day to enable travelers to complete their intended road journey without disruption. Concrete bridges in particular suffer deterioration due to the harsh environment that they are subjected to such as chloride attack from de-icing salts or carbonation attack due to the atmosphere. Inspection is, therefore, required to ensure that these structures are fit for purpose and safe to use. The UK Bridges Board has developed a comprehensive Inspection Manual to ensure all structures are uniformly inspected and to a high standard. The inspection process involves completing a proforma where defects are graded between 1 (no defect) to 5 (collapse). The inspector is able to use a table (Table G. 10) within the Inspection manual, which provides guidance on severity descriptions for different construction materials. However, for reinforced concrete beams exhibiting main steel corrosion, the relationship between severity of defect and loss of strength is not quantitatively obvious. The paper gives the bridge inspector an appreciation of the loss of strength as a result of corrosion to reinforced concrete simply supported beams. The analysis is mainly concerned with the predicted loss at severity code 3 from the manual, which assumes moderate defect/damage, with some loss of functionality.

scholarly journals Impact of Chloride Attack on Basalt Fibre Reinforced Concrete

2019 ◽  
Vol 8 (12) ◽  
pp. 4467-4469
Keyword(s):  
Reinforced Concrete ◽  
Construction Materials ◽  
Basalt Fiber ◽  
Fiber Reinforced Concrete ◽  
Basalt Fibers ◽  
Penetration Test ◽  
Acid Attack ◽  
Basalt Fibre ◽  
Standard Size ◽  
Chloride Attack

Basalt fibers are extensively used construction materials due to its advantages. This paper emphasizes the behavior of basalt fiber reinforced concrete (BFRC) subjected to chloride attack. Basalt fibers are added in proportions of 0.5%, 1.0%, 1.5%, 2%, and 2.5%. Grade of concrete is M40. Cubes were casted for a standard size of 150*150*150mm and cured for a period of 28 days. Chloride attack is calculated by dipping the cubes in 5% of sodium chloride solution for a span of 28, 60 and 90 days. To estimate the chloride attack impact on BFRC, BFRC is tested for compressive strength, Acid attack and Rapid chloride penetration test.

Durability Study of Reinforced Concrete Bridge

2012 ◽  
Vol 204-208 ◽  
pp. 2061-2064
Author(s):  
Chao Jue Yi
Keyword(s):  
Reinforced Concrete ◽  
Influencing Factors ◽  
Steel Corrosion ◽  
Corrosion Mechanism ◽  
Concrete Bridge ◽  
Direct Factor ◽  
Reinforced Concrete Bridge ◽  
Reinforced Steel

Steel corrosion is the most important and direct factor of reinforced steel concrete bridge durability damage as well as one of the main forms of the concrete bridge durability destruction. This article gives a comprehensive discuss from the corrosion mechanism, influencing factors and consequences.

scholarly journals Evaluation of Heating Technique of Deformed Reinforcement Using High-Frequency Induction Heating System

2021 ◽  
Vol 11 (11) ◽  
pp. 4947
Author(s):  
Myung-hwan Lim ◽  
Changhee Lee
Keyword(s):  
Reinforced Concrete ◽  
Temperature Rise ◽  
High Frequency ◽  
Thermal Conduction ◽  
Rapid Heating ◽  
Heating System ◽  
Inductive Heating ◽  
Reinforced Steel ◽  
Induction Heating System ◽  
High Frequency Induction

To improve recycling quality, it is necessary to develop a demolition technology that can be combined with existing crushing methods that employ large shredding-efficient equipment. The efficient collection of bones in a segmentation dismantling method must be considered according to the procedure. Furthermore, there is a need for the development of partial dismantling technologies that enable efficient remodeling, maintenance, and reinforcement. In this study, we experimentally investigated the temperature-rise characteristics of reinforced concrete through partial rapid heating during high-frequency induced heating. Accordingly, the chemical and physical vulnerability characteristics of the reinforced concrete were verified by studying the thermal conduction on the surface of the rebars and the cracks caused by the thermal expansion pressure of the rebars. Furthermore, we aimed to verify the applicability of the proposed technology by specifying the vulnerability range of the reinforced concrete based on the heating range, as well as the appropriate energy consumption. We investigated the temperature rise and temperature distribution characteristics of the rebar surfaces based on diameter, length, bar placement conditions, heating distance, heating coil location, and output, using reinforced steel of grade SD345. Maximum powers of 5, 6, and 10 kW, and inductive heating were used to achieve satisfactory results.

scholarly journals Relationship model between surface strain of concrete and expansion force of reinforcement rust

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Fanxiu Chen ◽  
Zuquan Jin ◽  
Endong Wang ◽  
Lanqin Wang ◽  
Yudan Jiang ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Real Time ◽  
Steel Corrosion ◽  
Surface Strain ◽  
Concrete Cracking ◽  
Whole Process ◽  
Steel Bars ◽  
Relationship Model ◽  
Expansion Force ◽  
Corrosion Of Steel

AbstractConcrete cracking caused by corrosion of reinforcement could significantly shorten the durability of reinforced concrete structure. It remains critical to investigate the process and mechanism of the corrosion occurring to concrete reinforcement and establish the theoretical prediction model of concrete expansion force for the whole process of corrosion cracking of reinforcement. Under the premise of uniform corrosion of reinforcing steel bars, the elastic mechanics analysis method is adopted to analyze the entire process starting from the corrosion of steel bars to the cracking of concrete due to corrosion. A relationship model between the expansion force of corrosion of steel bars and the surface strain of concrete is established. On the cuboid reinforced concrete specimens with square cross-sections, accelerated corrosion tests are carried out to calibrate and verify the established model. The model can be able to estimate the real-time expansion force of reinforced concrete at any time of the whole process from the initiation of steel corrosion to the end of concrete cracking by measuring the surface strain of concrete. It could be useful for quantitative real-time monitoring of steel corrosion in concrete structures.

Biomass Conversion Products as Steel Corrosion Inhibitors

2019 ◽  
Vol 92 (5) ◽  
pp. 620-624
Author(s):  
V. I. Mishurov ◽  
E. N. Shubina ◽  
V. A. Klushin ◽  
A. A. Chizhikova ◽  
V. P. Kashparova ◽  
...  
Keyword(s):  
Corrosion Inhibitors ◽  
Biomass Conversion ◽  
Steel Corrosion
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