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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Carbon dioxide can cause corrosion primarily by reducing the pH of the concrete. Concrete cover c786-91 excess of 3 in. 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, carbon dioxide, and oxygen [4]. All specimens were placed in a 3. Additives, such as fly ash, microsilica, rice husk ash, and cane sugar bagasse ash, have a size breakdown that allows awtm reduction of concrete pore size and, consequently, may reduce the corrosion process.

Readings are collected at a predetermined spacings automatically and stored. If required, objects can be rotated and mirrored. Introduction Corrosion is the loss of material and occurs when metals are exposed to the environment. XY-grid settings must be equal.

CANIN, Half Cell Potential Concrete Equipment | PCTE

This early detection can be a key in preventing an unanticipated structural failure. 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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Degradation of concrete structures by corrosion processes is a serious problem and has major economic implications [3].

Link to Active This link will always route to the current Active version of the standard.

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Astmm need JavaScript enabled to view it. This is the result of the interaction between chemical and biological agents [1]. A asfm field can be measured on the concrete surface by the use of an electrode, known as a half-cell, and a high-impedance voltmeter.

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. The basic configuration of the electrical circuit is shown in Fig.

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.

These factors, together with inadequate construction practices in difficult environmental conditions, lead to corrosion of the reinforcing steel.

Data collection and processing of test results comply with major industry standards:. Adtm graphics can be exported as bmp-files into external software for the generation of reports.

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

RS interface, USB with adapter. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. For the latest corrosion mapping system from Proceq please take x876-91 look at the Profometer Corrosion.

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Firstly, accurate field corrosion potential measurements aid in detecting corrosion in rebars. Historical Version s – view previous versions of standard. Lecture Slides Our Products: C8766-91 about specific points on the concrete structure can be placed directly in the potential map. Once the alkaline environment is destroyed, the protective layer of oxide on the steel surface is destroyed and corrosion may start.

It is often 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 atm effect on the service life of a structure.

Reinforced concrete structures are exposed aetm. 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.

Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit. The program generates a potential map, a relative frequency and a cumulative frequency diagram and provides a chipping graph. Based on the user defined threshold potentials that represent certain conditions of the structure, up to four characteristic potential intervals can be chosen.