What is half-cell potentiometer test?

The half-cell potential test is the only corrosion monitoring technique standardized in ASTM C876 – 15: Standard Test Method for Corrosion Potentials of Uncoated Reinforcing Steel in Concrete. It is used to determine the probability of corrosion within the rebar in reinforced concrete structures.

What is half-cell survey?

The half-cell potential survey is used to provide information on the likelihood of corrosive activity to embedded reinforcement, but with only minimal damage to the overlying concrete. Corrosion is an electrochemical process and the condition of the steel is assessed by measuring its half-cell potential.

Which metal is used as electrode in half-cell potentiometer test?

Typically, for reinforced concrete applications, a copper/copper sulfate electrode (Cu/CuSO4) or silver/silver chloride electrode (Ag/AgCl) is used for the half-cell reference. This reference electrode is connected to the other half-cell represented by the embedded rebar (Figure 2b).

What is half-cell potentiometer?

The Half Cell Potentiometer is used to measure the half-cell potential of reinforcement steel in concrete (in accordance with ASTM C876) for assessment of corrosion in steel reinforcement. Typical applications include the following: Measuring the corrosion activity in repaired areas.

What is half-cell example?

A half cell is one of the two electrodes in a galvanic cell or simple battery. For example, in the Zn−Cu battery, the two half cells make an oxidizing-reducing couple. Placing a piece of reactant in an electrolyte solution makes a half cell.

What is a core test?

Core tests are generally performed to assess whether suspect concrete in a new structure complies with strength-based acceptance criteria or not. In addition, it is critically used to determine in-place concrete strengths in an existing structure for the evaluation of structural capacity.

How does a half cell potential meter test work?

Spectro Labs provide Half Cell Potential Metre test can give the probability of corrosion activity taking place at the point where the measurement of potentials is taken from a half-cell, typically a copper-copper sulphate half-cell. Half Cell Potential Meter Testing

What is the purpose of a potentiometer test?

The instrument measures the potential and the electrical resistance between the reinforcement and the surface to evaluate the corrosion activity as well as the actual condition of the cover layer during testing.

What kind of electrode is used for half cell test?

To apply this concept to concrete and to interpret the results of corrosion potential, a reference electrode with a known potential is needed. Typically, for reinforced concrete applications, a copper/copper sulfate electrode (Cu/CuSO4) or silver/silver chloride electrode (Ag/AgCl) is used for the half-cell reference.

What are the ranges of half cell potentials?

Table 2: Typical ranges of half-cell potentials of rebar in concrete (adapted from RILEM TC-154, 2003) In addition, half-cell measurement is considered to be a zonal measurement as it will take an average potential measurement of the surroundings.