Concrete Chloride Sensing
Concrete Chloride Sensing - Related Videos
10:00
Experimental Protocol to Determine the Chloride Threshold Value for Corrosion in Samples Taken from Reinforced Concrete Structures
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Cited by 38 •
2017
We propose a method to measure a parameter that is highly relevant for corrosion assessments or predictions of reinforced concrete structures, with the main advantage of permitting testing of samples from engineering structures. This ensures real conditions at the steel-concrete interface, which are crucial to avoid artifacts of laboratory-made samples.
07:32
Dynamic Electrochemical Measurement of Chloride Ions
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Cited by 5 •
2016
Dynamic measurement of chloride ions is presented. Transition time of an Ag/AgCl electrode, during a chronopotentiometric technique, can give the concentration of chloride ions in electrolyte. This method does not require a stable conventional reference electrode.
11:23
Tests on Fresh Concrete
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2017
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA Concrete consists of two phases, a cement paste phase comprised of cement, water, and air, and an aggregate phase comprised of coarse and fine aggregates. There are two key considerations when designing a concrete mix. First, the concrete must be workable and easy to cast in the forms in its fresh condition, even when the forms are packed with steel reinforcement. In this condition, it is the...
10:09
Tests of Hardened Concrete in Tension
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA In a previous laboratory focused on concrete in compression, we observed that concrete can withstand very large stresses under uniaxial compressive forces. However, the failures observed were not compressive failures but failures along shear planes where maximum tensile forces occur. Thus, it is important to understand the behavior of concrete in tension and particularly its maximum strength...
08:08
Compression Tests on Hardened Concrete
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2023
Source: Roberto Leon, Department of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA There are two distinct stages in a construction project involving concrete. The first stage involves batching, transporting, and casting fresh concrete. At this stage, the material is viscous, and the workability and finishability are the key performance criteria. The second stage occurs when the hydration process begins shortly after the concrete is placed in the form, and the concrete will...
FAQs
Ion-selective electrodes respond to chloride activity or concentration within the concrete and convert that chemical information into an electrical signal. The measured signal provides a way to track chloride conditions without relying only on visual evidence of deterioration. Researchers can use these readings to compare exposure conditions and evaluate whether chloride levels approach conditions associated with reinforcement corrosion.
The pore network provides the pathways through which chloride ions enter and move within concrete, so measurements reflect both chemical exposure and transport through the material. Characterizing readings at different locations or stages helps researchers study chloride transport rather than treating chloride as uniformly distributed. This distinction is important when assessing durability and interpreting local corrosion risk.
Chloride activity describes the chemically effective condition of chloride ions, whereas concentration describes the amount present in the measured concrete environment. Electrochemical sensors may respond to either quantity, so researchers must understand what the sensor output represents before comparing results. This distinction supports more meaningful evaluation of exposure, transport behavior, and corrosion-related conditions.
Interpretation should consider the concrete’s chemical exposure, chloride movement through its pore network, and whether the measurement represents activity or concentration. Results become more useful when connected to the condition of embedded steel and the possibility of corrosion initiation. This approach allows researchers to distinguish a simple chloride measurement from evidence relevant to concrete durability.
Researchers can compare chloride measurements in concrete before and after applying a protective treatment, provided the measurements are interpreted under comparable exposure conditions. Changes in detected chloride activity or concentration can help characterize how the treatment affects chloride entry or transport. The resulting evidence supports durability testing and assessment of treatment performance in concrete materials research.
Measurements provide chemical and materials data that researchers can use when developing concrete mixtures or monitoring systems intended to extend service life. By characterizing chloride transport and identifying conditions linked with corrosion initiation, the technique connects mixture design with durability performance. It also supports infrastructure inspection by supplying information beyond surface appearance alone.