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Showing 1 to 20 of 42 for “"Reinforcement corrosion"”.
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Concrete crack width under combined reinforcement corrosion and applied load
… dioxide laden and other aggressive environments, corrosion of the reinforcing steel is seen as a global problem. Maintenance and repairs resulting primarily from premature concrete cracking and spalling have an estimated cost running to $100 billion per annum world-wide. The continual demands for …
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Role of cement content in determining resistance of concrete to reinforcement corrosion
… problems related to concrete structures, corrosion of reinforcing steel is the single most serious deteriorating process and this is likely to be more severe in the presence of defects (e. g. cracks)in the concrete surface. The review of published literature shows that at fixed w/c ratio, …
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Effects of reinforcement corrosion on the structural performance of reinforced concrete beams
… is an investigation into the effect of reinforcement corrosion on the structural performance of reinforced concrete beams. Two types of specimens are investigated, the first without any stirrups and the second with stirrups. The specimens were corroded galvanostatically as well as by …
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Review of current practices to reduce reinforcement corrosion in concrete structures managed by the City of Cape Town
… against concrete deterioration and rebar corrosion have become far more important for road authorities and asset managers. City Engineers are responsible for the repair and rehabilitation of RC structures in different exposure conditions, by identifying the type of deterioration and then …
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Improvement of the approaches to monitoring of reinforced concrete bridges subjected to chloride-induced reinforcement corrosion in bridge management systems
Reinforcement corrosion in reinforced concrete (RC) bridges has undeniably become the main cause of civil infrastructure durability problems in many countries. The steel reinforcing in concrete corrode when certain conditions (e.g., carbonation, chlorides, insufficient cover and moisture) are met. …
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The effect of cyclic wetting and drying on the corrosion rate of steel in reinforced concrete
Preventing chloride-induced reinforcement corrosion in marine concrete structures remains a concern for structural engineers. Marine structures are typically exposed to high chloride concentrations through direct exposure to sea water, which provides the primary conditions required for …
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Reliability-based performance assessment and optimum maintenance of corroded reinforced concrete structures
Reinforcement corrosion is one of the major causes of deterioration of reinforced concrete structures exposed to aggressive environments. Deterioration caused by reinforcement corrosion reduces the serviceability and load bearing capacity of the concrete structures to an extent of serious …
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The influence of various factors on the results of carbonation, cover depth, half-cell potential and resistivity tests that are used in the assessment of reinforcement corrosion
Reinforcement corrosion is the main cause of deterioration in concrete structures. Condition assessment tests help to predict whether reinforcement corrosion is occurring and aid in the prevention of its consequences. The results of these condition assessment tests can, however, be affected by …
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Residual strength of corroded reinforced concrete beams.
Currently, much research is focused on the corrosion of reinforcement in concrete members. However, none addresses the problems associated with the residual strength of reinforced concrete beams exhibiting both main and shear reinforcement corrosion simultaneously. The aim of this research, …
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Performance of a penetrating corrosion inhibitor in controlling carbonation induced corrosion in reinforced concrete
Reinforcement corrosion in concrete remains the most serious cause of premature deterioration of concrete structures world-wide, and many methods have been proposed to combat this problem. One method of improving the durability of concrete in aggressive environments is the use of corrosion …
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Chloride transport and chloride thresholdvalues-Studies on concretes and mortars with Portland cement and limestone blended cement
… the surrounding environment. Chloride initiated reinforcement corrosion is one of the major causes of deterioration of concrete structures. One conflicting issue is how replacing Portland cement with mineral additions influences chloride initiated reinforcement corrosion. This issue is of …
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Corrosion of reinforcement in concrete : the effectiveness of organic corrosion inhibitors
Reinforcement corrosion in concrete has presented engineers with the challenge of finding ways of prolonging the service life of structures built in aggressive environments. One method of increasing the durability of concrete in aggressive environments is the use of corrosion inhibitors. In this …
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Deterioration of reinforced concrete in a marine environment : repair costs and maintenance strategies
… deteriorate in the Cape Peninsula due to reinforcement corrosion, the reasons for this deterioration, and the accompanying repair costs. The costing of repair work is calculated per m2 of reinforced concrete and is based on quoted labour rates and material rates of repair materials …
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Vida útil residual de estructuras de hormigón armado afectadas por corrosión
… a comprehensive approach to the phenomenon of reinforcement corrosion in the diferents types of reinforced concrete structures, to reach this objective we will describe the phenomenon, explaining its forms of appearance (wet or dry corrosion) and their predisposing factors (carbonation, …
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Effect of Stay-in-Place Metal Forms on Performance of Concrete Bridge Decks
… SIPMFs, indicating that a more active state of corrosion exists on decks with SIPMFs. On average, the chloride concentration in the bridge decks with SIPMFs was 205 percent greater than the concentration in the decks without SIPMFs. Among all of the distress measurements evaluated in the …
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Geopolymer-based moisture and chloride sensors for nuclear concrete structures
… deterioration. The main cause of degradation - reinforcement corrosion, accelerated by moisture and chloride exposure - costs the global economy a staggering {dollar}2.3 trillion per year (3.4% GDP, 2013). The nuclear industry faces a particular challenge, as concrete assets are usually coastal …
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CORROSION RESISTANCE PERFORMANCE INVESTIGATION OF MILD STEEL BAR COATED WITH MAGNESIUM PHOSPHATE CEMENT PASTE
<p>"In this research study, the anti-corrosion mechanism of reinforcement embedded in magnesium potassium phosphate cement (MKPC) is explored. In addition, one type of additives, metakaolin, and one type of retarder, boric acid, are employed in MKPC to modify its properties in order to further …
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Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete
… to cracking and spalling from chloride induced corrosion of steel reinforcement. One method being considered as a possible corrosion abatement measure is the removal of chloride contaminated concrete and the chemical treatment of the partially exposed rebar through ponding and/or placement of …
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Towards a triphasic Theory of Porous Media-based model for chloride-induced corrosion in reinforced concrete
… concrete subjected to chloride-induced corrosion. Research has shown that although the majority of time-to-cracking service life models for reinforced concrete structures neglect the permeation of rust into the cement paste adjacent to the reinforcement, it is this mechanism that is …
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A Critical Evaluation of the Use of Crack Width Requirements in the Durability Design of Marine Reinforced Concrete Structures
… clear relationship between crack width and steel reinforcement corrosion rate in concrete has been found. Instead, there exist two opposing schools of thought in the literature – one which says that there is a relationship between crack width and reinforcement corrosion rate, and one which argues …
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