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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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. 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. This statistical presentation is the basis for an efficient interpretation of the half-cell potentials astmm the corrosion engineer.

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

Historical Version s – view previous versions of standard. Degradation of concrete structures by corrosion processes is a serious problem and has major economic implications [3].

Once the alkaline axtm is destroyed, the protective layer of oxide on the steel surface is destroyed and corrosion may start. XY-grid settings must be equal.

CANIN, Half Cell Potential Concrete Equipment | PCTE

All graphics can be exported as bmp-files into external software for the generation of reports. Reinforced concrete structures are exposed atm. This early detection can be a key in preventing an unanticipated structural failure. Comments about specific points on the concrete structure can be placed directly in the potential map.

In service conditions, the concrete covering the steel bars gives physical and chemical protection to the reinforcement. The results showed that reinforced concrete containing sugar cane bagasse ash has the lowest corrosion rates in comparison to reinforced concrete without the additive.

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The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

Perth Head Office e This email address is being protected from spambots. Concrete surface in building interiors and desert environments lose sufficient moisture so that the concrete resistivity becomes so high that special testing techniques not covered in this test method may be required see 5. Up to measurement values are displayed at a time in xstm read grey-scale and a menu-driven approach facilitates simple operation using just nine keys.

Corrosion of reinforced steel has atsm principal problems that affect the service life of concrete reinforced structures [2]. Concrete cover in excess of 3 in.

It enables the identification of concrete corrosion before it becomes visible and has caused damage. Brisbane e This email address is being protected from spambots. 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 probable effect on the service life of a structure.

For the latest corrosion mapping system from Proceq please take a look at the Profometer Corrosion. Link to Active This link will always route to the current Active version of the standard. 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]. Introduction Corrosion is the loss of material and occurs when metals are exposed to the environment.

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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Separately measured objects can be merged axtm a complete potential map. Data collection and processing of test results comply with major industry standards:. All specimens were placed in a 3. Concrete surfaces that asm coated or treated with sealers may not provide an acceptable electrical circuit. Six AA batteries, 1. 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.

This is asstm result of the interaction between chemical and biological agents [1]. Selectable grid with metric or imperial units. 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. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.

Lecture Slides Our Products: Single files can be opened and processed separately. If aetm, objects can be rotated and mirrored.

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The program generates a potential map, a relative frequency and a cumulative frequency diagram and provides a chipping graph. Carbon dioxide can cause corrosion primarily by reducing the pH of the concrete.

You need JavaScript enabled to view it. Corrosion of steel in concrete is an electrochemical process. These factors, together with inadequate construction practices in difficult environmental conditions, lead to corrosion of the reinforcing steel.