ASTM C876-91 PDF

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

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Lecture Slides Our Products: Once the alkaline environment is destroyed, the protective layer of oxide on the steel surface is destroyed and corrosion may start. This early detection can be a key in preventing an unanticipated structural failure.

In service conditions, the concrete covering the steel bars gives physical and chemical protection to the reinforcement. Brisbane e This email address is being protected from spambots. This statistical presentation is the basis for an efficient interpretation of the half-cell potentials by the corrosion engineer.

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Selectable grid with metric or imperial units. XY-grid settings must be equal.

Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit. 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.

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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. All graphics can be exported as bmp-files into external software for the generation of reports. For the latest corrosion mapping system from Proceq please take a look at the Profometer Corrosion. Separately measured objects can be merged to a complete potential map.

Concrete cover in excess of 3 in. All specimens were placed in a 3. The basic configuration of the electrical circuit is shown in Fig. You need JavaScript enabled to view it. Corrosion of reinforced steel has two principal problems that affect the service life of concrete reinforced structures [2]. Additives, such as fly ash, microsilica, rice husk ash, and cane sugar bagasse ash, have a size breakdown that allows the reduction of concrete pore size and, consequently, may reduce the corrosion process.

Data collection and processing of test results comply with major industry standards:. C8776-91 are collected astmm a predetermined spacings automatically and stored. Comments about specific points on the concrete structure can be placed directly in the potential map. Link to Active This link will always route to the current Active version of the standard. 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.

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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.

Firstly, accurate field corrosion potential measurements aid in detecting corrosion in rebars. These factors, together with inadequate construction practices in difficult environmental conditions, lead to corrosion of the reinforcing steel. Six AA batteries, 1. Single c876-911 can be opened and processed separately.

CANIN, Half Cell Potential Concrete Equipment | PCTE

The results showed that reinforced concrete containing sugar cane bagasse ash has the lowest corrosion rates in comparison to reinforced concrete without the additive. It enables the identification of concrete corrosion before it becomes visible and has caused damage. If required, objects can be rotated and mirrored. This is the result of the interaction between chemical and biological agents [1].

It is often necessary to v876-91 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.

Reinforced concrete structures are exposed to.

Corrosion of steel in concrete is an electrochemical process. Perth Head Office e This email address is being protected from spambots.

RS interface, USB with adapter.