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"Reinforcing bars Corrosion"
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Electrochemical processes and corrosion in reinforced concrete
\"Some reinforced concrete structures prematurely corrode as they age, with significant financial implications, but it is not immediately clear why some are more durable than others. This book looks at the various mechanisms for corrosion and how what seemed to be a relatively simple matter has become more complex the further it is understood due to the properties of concrete, steel and the way reinforced concrete structures are constructed. The significance of electrochemical processes is identified with recent research using new technology discussed. Specialist contractors, consultants and owners of corrosion damaged structures will find this an extremely useful resource. It will also be a valuable reference for students at postgraduate level\"-- Provided by publisher.
BOOK
Steel Corrosion in Concrete
Poor durability of concrete is a major cause of problems in modern building and civil engineering structures in all countries: the annual cost of investigating and repairing deteriorating reinforced concrete structures runs into many millions of pounds. This book explains the fundamentals of the corrosion of steel in concrete. It is comprehensive a
Introduction. Mechanisms of Steel Corrosion. Relations Between Corrosion and the Structure and Properties of Concrete. Corrosion Measurements. Corrosion Damage. Corrosion Measurements. Corrosion Control. Specificaitons and Design. Repair and Rehabilitation. Index.
eBook
Corrosion of Steel in Concrete - Prevention, Diagnosis, Repair (2nd Edition)
Steel-reinforced concrete is used ubiquitously as a building material due to its unique combination of the high compressive strength of concrete and the high tensile strength of steel. Therefore, reinforced concrete is an ideal composite material that is used for a wide range of applications in structural engineering such as buildings, bridges, tunnels, harbor quays, foundations, tanks and pipes. To ensure durability of these structures, however, measures must be taken to prevent, diagnose and, if necessary, repair damage to the material especially due to corrosion of the steel reinforcement.
The book examines the different aspects of corrosion of steel in concrete, starting from basic and essential mechanisms of the phenomenon, moving up to practical consequences for designers, contractors and owners both for new and existing reinforced and prestressed concrete structures. It covers general aspects of corrosion and protection of reinforcement, forms of attack in the presence of carbonation and chlorides, problems of hydrogen embrittlement as well as techniques of diagnosis, monitoring and repair.
eBook
Quantitative Relationship Involving Reinforcing Bar Corrosion and Ground-Penetrating Radar Amplitude
Ground-penetrating radar (GPR) has been used for qualitative assessment of defects in reinforced concrete structures, such as corrosion-induced deterioration in concrete bridges. However, reliable quantitative models for GPR estimations of reinforcing bar corrosion are unavailable. This study quantitatively related the reinforcing bar corrosion with the maximum reflected waveform amplitude from GPR scanning. Accelerated corrosion was used to induce reinforcing bar corrosion, and GPR scanning monitored corrosion at three stages: before and after submersion into saltwater solution and at the end of a preset corrosion period. As expected, the reinforcing bar corrosion mass loss was greater for longer corrosion periods, larger reinforcing bar size, and lower cover. The GPR amplitude increased with increased corrosion activity. A set of polynomial curves were proposed for particular dielectric constant, reinforcing bar size and cover. The model was calibrated with the GPR scan data from a portion of a demolished old concrete bridge deck.
Journal Article
Inhibition of Steel-Rebar Corrosion in Industrial/Microbial Simulating-Environment by Morinda lucida
This paper studies inhibition of steel-rebar corrosion in concrete immersed in 0.5 M H2SO4, simulating industrial/microbial environment by the leaf extract of Morinda lucida. Electrochemical monitoring methods were employed for testing different concentrations of the leaf extract admixed in duplicated specimens of steel-reinforced concrete slabs immersed in the acidic test-system. Statistical analyses as per ASTM G16-95 R04 of the experimental results showed that effectiveness of Morinda lucida at inhibiting concrete steel-rebar corrosion increased with the concentration of the admixture. 0.4167% Morinda lucida, per weight of cement, was identified with optimum inhibition efficiency η = 98.78±0.34% followed in effectiveness by 0.3333% Morinda lucida with η = 93.20±1.76% at inhibiting steel-rebar corrosion in the corrosive test-environment.
Journal Article
Cathodic Protection of Steel in Concrete and Masonry
Written for a professional audience, this state-of-the-art reference book is essential reading for the professional engineer or skilled person working in the refurbishment of concrete or masonry structures, or those seeking to produce more durable reinforced concrete structures. This new edition builds on the success of the previous version by including more detail on the design factors involved in cathodic protection. It also reviews the new international standard EN ISO12696, research and product development, and a diverse range of installations that have been successfully completed.
eBook
Corrosion Behavior of Hybrid Organic-Inorganic Coated Steel in Simulated Concrete Pore Solution
This work compares the anticorrosion features of polysiloxane hybrid films deposited on carbon steel substrates by dip-coating. To assess the influence of the components, sol-gel coatings were prepared from condensation and polymerization of TEOS and MPTS, TEOS and MTES, TMOS and MPTS or TMOS and MTES in three molar ratios. The corrosion resistance of the coatings was evaluated by means of polarization curves and the coatings’ thicknesses and compositions were analyzed by a field emission-scanning electron microscopy.
Journal Article
Mild Steel Passivation and Depassivation in Simulated Concrete Pore Solution Containing Bacteria Metabolites
Although much less investigated than that induced by chlorides, the corrosion of steel reinforcing bars due to bacteria metabolic products is recognised as a serious issue, primarily for concrete pipes in sewer network. In order to overcome the complications due to the preparation of concrete samples the investigation was performed using simulating solutions. The passivation of the metallic specimens was obtained by immersion in Ca (OH)2 sat and monitored through several different electrochemical techniques. The depassivation was induced by either sulphuric acid or sulphides in order to simulate different bacterial metabolites. Anodic polarization curves and optical microscopy examination revealed a significant corrosion in the former case, while a competitive interaction among the sulphide and the alkalinity was hypothesized in sulphide-containing solutions.
Journal Article
Experimental Study on Reliability of Wireless Sensors for Monitoring Corrosion of Reinforcing Bars
It is urgent to study the reliability of wireless sensors for monitoring corrosion in concrete under different environmental stress. Therefore, after the analysis of failure mechanism for wireless sensors, four reliability tests, i.e. salt solution erosion test, impact test, high temperature and humid test and low temperature test, had been conducted. Signals of the sensors were analyzed through the interval estimation. It is shown that the signals of the sensors present high stability and the reliability of sensors reaches 95% in the respective confidence interval within the temperature range of-30°C~50°C. While the signals increase rapidly at the beginning, and then slowly increase to a flat level in the end within 50°C~90°C. Data from the impact test and salt solution erosion test also indicate that the sensors also present high stability and reliability.
Journal Article
LABORATORY EVALUATION OF CONCRETE WITH NORMAL AND LIGHTWEIGHT AGGREGATES ON CORROSION OF REINFORCING BARS IN ENVIRONMENTS CONTAINING CHLORIDE AND SULFATE
' The present study investigates the effect of aggregate type on the amount of chloride ion penetration in normal weight concrete (NWC) and lightweight concrete (LWC) samples under the influence of sulfate ion. To examine the effect of W/C ratio, all mixes are made with three different W/C ratios of 0.4, 0.45 and 0.5 in this research. Also, the amount of silica fume (SF) in three values of 0, 7% and 10% were substituted for cement to consider the effect of pozzolanic materials on the level of penetration of chloride and sulfate ions. Compressive strength tests, Capillary water absorption, electrical resistivity, Rapid chloride migration test (RCMT) and accelerated corrosion test were done on concrete samples with light-weight and normal aggregates. The results of these two concrete specimens were compared. The results showed that the corrosion rate of steel bar was higher with increasing ratio of W/C. Also, the mechanical and durability properties of concrete was improved by adding SF to the concrete mix design , resulting in the lowest corrosion rate in the two, chloride solution and combined magnesium sulfate - chloride solution. In addition, concrete samples in the chloride solution became more corrosive than the combined chloride - magnesium sulfate solution. Finally, a neural network model was developed to determine the chloride ion permeation coefficient and the corrosion rate of steel in normal and lightweight aggregates.
Journal Article