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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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.

Carbon dioxide can cause corrosion primarily by reducing the pH of the concrete. C876–91 settings must be equal. Corrosion of reinforced steel has two principal problems that affect the service life of concrete reinforced structures [2].

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. Comments about specific points on the concrete structure can be placed directly in the potential map.

CANIN, Half Cell Potential Concrete Equipment | PCTE

However, the passive layer does not provide a perfect and permanent c8769-1 in aggressive environments containing initiators of corrosion primarily aggressive ions like sulphates and chlorides, humidity, carbon dioxide, and oxygen [4].

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. Reinforced concrete structures are exposed to. Separately measured qstm can be merged to a complete potential map. Data collection and processing of test results comply with major industry standards:.


Selectable grid with metric or imperial units.

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

It enables the identification of concrete corrosion before it becomes visible and has caused damage. Six AA batteries, 1. Readings are collected at a predetermined spacings automatically and stored. 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.

Historical Version s – view previous versions of standard.

For the latest corrosion mapping system from Proceq please take a look at the Profometer Corrosion. All specimens were placed in a 3.

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. 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.

Corrosion of steel in concrete is an electrochemical process. In service conditions, the concrete covering the steel bars gives physical and chemical protection to the reinforcement. This early detection can c876-1 a key in preventing an unanticipated structural failure. Sydney e This email address is being protected from spambots.


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 basic configuration of the electrical circuit is shown asstm Fig.

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You need JavaScript enabled to view it. The results showed that reinforced concrete containing sugar cane bagasse ash has the lowest corrosion rates in comparison to reinforced concrete without the additive. 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.

Additives, such as fly ash, microsilica, rice husk ash, and cane sugar bagasse ash, have a size c8769-1 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. Introduction Corrosion is the loss of material and occurs when metals are exposed to the environment. Brisbane e This email address is being protected from spambots.

Based on the user defined threshold potentials that represent certain conditions of the structure, up to four characteristic potential intervals can be chosen. Concrete cover in excess of 3 in. RS c86-91, USB with adapter.