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Showing 1 to 18 of 18 for “"half-cell potential"”.
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Sensitivity of Half-Cell Potential Measurements to Properties of Concrete Bridge Decks
Half-cell potential testing has been recommended as a non-destructive method for assessing the corrosion potential of reinforcing steel in concrete bridge decks. The technique is particularly useful because it can be utilized to evaluate the probability of corrosion before damage is evident at the …
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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
… carrying out four of these tests, namely the half-cell potential (HCP), cover depth, carbonation and resistivity tests was performed on several concrete structures on upper campus at UCT. The half-cell potential and resistivity tests were carried out across a four-month period between August …
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Development of an Index for Concrete Bridge Deck Management in Utah
… inspection, sounding, Schmidt hammer testing, half-cell potential testing, and chloride concentration testing were performed on six 6-ft by 6-ft test areas randomly distributed within the single lane closed to traffic on each deck, and testing protocols followed American Society for Testing and …
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Development of measurement techniques for evaluation of inhibitors for controlling rebar corrosion in concrete
… the effects of the rebar network on corrosion. Half-cell potential measurements were used to monitor the corrosion behavior of each specimen. In a second time, calcium nitrite, monofluorophosphate and sodium borate were evaluated for their capacity to control corrosion. The various corrosion …
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Chemical treatment of corroding steel reinforcement after removal of chloride contaminated concrete
… subjected to repeated exposure to NaCl solution. Half-cell potential, corrosion rate, and chloride ion concentration measurements were conducted until the indication of active reinforcement corrosion. Chloride contaminated concrete was removed to the rebar level through a grooving process. The …
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Effect of Stay-in-Place Metal Forms on Performance of Concrete Bridge Decks
… hammer sounding, Schmidt hammer testing, half-cell potential testing, and chloride concentration testing. Because differences in deck age and average cover for the two deck types were found to be statistically significant, the collected data were subjected to analysis of covariance …
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The reduction of organic compounds of sulfur by metals in liquid ammonia
… for the first time. 2. A metal with a high half-cell potential favors a greater extent of reduction than a lower potential metal. 3. The greater the concentration of ammonium ion as a proton donor, the greater will be the evolution of hydrogen, and the lower will be the extent of reduction. …
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Non-Destructive Bridge Deck Condition Assessment with a Probability-Based Deterioration Threshold
… for ground penetrating radar and volts for half-cell potential), making data interpretation and comparison difficult for bridge owners and practitioners. The deterioration threshold, or the transition between healthy and deteriorated areas, is essential in understanding NDE data. However, …
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ASSESSING CORROSION DAMAGE IN PRESTRESSED CONCRETE WITH ACOUSTIC EMISSION
… to serve as anode of the rapid corrosion cell. Specimens were either notched or unotched and 0.016 inch (0.4 mm) cracks were extended through the centerline of the specimens via three-point bending to analyze the effect of crack presence in byproduct development.</p> <p>The corrosion …
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Influence of Reinforcing Steel Parameters on the Formation of the Passive Layer
… has been conducted on the effects of macrocell corrosion compared to microcell corrosion. Previous studies have shown that the measured microcell corrosion is not augmented greatly by the macrocell current (Andrade et al. 1991). In this study, twenty-seven specimens were cast with …
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Corrosion Assessment for Failed Bridge Deck Closure Pour
… resistivity using single point resistivity, half-cell potential, and linear polarization using the 3LP device. Shrinkage characteristics were conducted on the lab cast slabs only, which consisted of monitoring shrinkage behavior of the specimens for 180 days and comparison of the data with …
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Discrete sacrificial anodes and their use in service life extension of chloride contaminated reinforced concrete structures
… repairs and corrosion inhibitors while other potentially successful methods such as sacrificial anodes are rarely applied. Sacrificial anode cathodic protection (SACP) systems use metals that are higher than steel in the electrochemical series. These metals corrode preferentially to steel …
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Condition Analysis of Concrete Bridge Decks in Utah
… radar imaging, resistivity testing, half-cell potential testing, and chloride concentration testing. The condition assessment testing confirmed that chloride-induced corrosion of reinforcing steel is the primary mechanism of deck deterioration and that inadequate cover over the upper …
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Influence of Bridge Deck Concrete Parameters on the Reinforcing Steel Corrosion
… assessment methods including resistivity, half-cell potential, linear polarization, chloride content, moisture content, and visual inspection. This study included the clear spacing distances between the anode and cathode of 51, 76, and 102 mm (2, 3, and 4-inch), number of cathodes as 1 and …
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Corrosion performance of coated steel bars in cracked and uncracked reinforced concrete beams
… realistic bridge deck conditions. As such, macrocell specimen subsets of uncoated, coated with holidays (intentional defects), ECR, and TEC reinforcing bar are curated and subjected to cycling chloride ponding. Additional ECR and TEC macrocell specimens are loaded in service-level displacement …
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Sulfide stress cracking resistance of API-X100 high strength low alloy steel in H2S environments
… more current densities. Moreover, the cathodic half cell potential increased due to the decrease in pH, from 2.9 to 2.7, which shifted the cathodic polarization curve to more current densities. The increase in both the anodic and cathodic currents, after H2S addition, caused the rise in the …
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Review of current asset maintenance in South African ports and recommendations for smart port maintenance
… delamination surveys and measurements of half-cell potential, corrosion rate and resistivity as part of the condition assessment methods with revised frequencies. Chloride profiling and service life prediction models are recommended to predict the remaining service life. A standardised …
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The development of empirical chloride-induced corrosion rate prediction models for cracked and uncracked steel reinforced concrete structures in the marine tidal zone
… corrosion experiments carried out by exposing half of 210 beam specimens to accelerated laboratory corrosion (cyclic 3 days wetting with 5% NaCl solution followed by 4 days air-drying) while the other half were left to undergo natural corrosion in a marine tidal zone in Cape Town (Table Bay). …