ASTM C876-91 PDF

1 This test method is under the jurisdiction of ASTM Committee G01 on Last previous edition approved in as C–91(), which. ASTM C Test Method for Half-Cell Potentials of Uncoated Reinforcing Steel in Concrete. The ASTM standard C [3] provides general guidelines for the . ASTM C 91() “Standard Test Method for Half-Cell Potentials of.

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These factors, together with inadequate construction practices in difficult environmental conditions, lead to corrosion of the reinforcing steel. Up to measurement values are displayed at a time in easy-to read grey-scale and a menu-driven approach facilitates simple operation using just nine keys. The values given in parentheses are mathematical conversions to SI asttm that are provided for information only and are not considered standard.

Six AA batteries, 1. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Reinforced concrete structures are exposed to. Concrete cover in excess of 3 in. Corrosion of reinforced steel has two principal problems that affect the service life of concrete reinforced structures [2].

Single files can be opened and processed separately.

CANIN, Half Cell Potential Concrete Equipment | PCTE

Readings are collected at a predetermined spacings automatically and stored. Concrete surface in building interiors and desert environments lose sufficient moisture xstm that the concrete resistivity becomes so high that special testing techniques not covered in this test method may be required see 5. Data collection and processing of test results comply with major industry standards:. The concrete cover provides an alkaline environment surrounding the steel, resulting in the formation of an oxide layer, called a passive film, which protects the steel from corrosion.

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XY-grid settings must be equal. This enable the inspector to immediately mark on the concrete surface the areas of concern and to later down load the data for printing in a report. It is ast, necessary to use other data such as chloride contents, depth of carbonation, delamination survey findings, rate of corrosion results, and environmental exposure conditions, in addition to corrosion potential measurements, to formulate conclusions concerning corrosion activity of embedded steel and its probable effect on the service life of a structure.

The results showed that reinforced concrete containing sugar cane bagasse ash has the lowest corrosion rates in comparison to reinforced concrete without the additive. Introduction Corrosion is the loss of material and occurs when metals are exposed astk the environment. This is the result of the interaction between chemical and biological agents [1].

However, the passive layer does not provide a perfect and permanent barrier in aggressive environments containing initiators of corrosion primarily aggressive ions like sulphates and chlorides, humidity, axtm dioxide, and oxygen [4].

In service conditions, the concrete covering the steel bars gives physical and chemical protection to the reinforcement. Corrosion of steel in concrete is an electrochemical process. Comments about specific points on the concrete structure can be placed directly in the potential map. Perth Head Office e This email address is being protected from spambots.

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Carbon dioxide can cause corrosion primarily by reducing the pH of the concrete. For the latest corrosion mapping system from Proceq please take aatm look at the Profometer Corrosion. Based on the user defined threshold potentials that represent certain c876–91 of the structure, up to four characteristic potential intervals can be chosen. A potential field can be measured on the concrete surface by the use of an electrode, known as a half-cell, and a high-impedance voltmeter.

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Firstly, accurate field corrosion potential measurements aid in detecting corrosion in satm. Concrete is a porous material and the ingress of water, oxygen, and aggressive ions, such as chlorides, can cause the passive layer on reinforced steel to break down. Separately measured objects can be merged to a complete potential map. Once the alkaline environment is destroyed, the protective layer of oxide on the steel surface is destroyed and corrosion may start.

You need JavaScript enabled to view it. Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit.

This statistical presentation is the basis for an efficient interpretation of the half-cell potentials by the corrosion engineer. If required, objects can be rotated and mirrored. Degradation of concrete structures by corrosion processes is a serious problem and has major economic implications [3].

CiteSeerX — ASTM C , Standard Test Method for Half-Cell Potentials of Uncoated Reinforcing

Historical Version s – view previous versions of standard. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory asym prior to use.

The basic configuration of the electrical circuit is shown in Fig. Lecture Slides Our Products: All graphics can be exported as bmp-files into external software for the generation of reports.