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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If required, objects can be rotated and mirrored. This is the result of the interaction between chemical and biological agents [1]. The program generates a potential map, a relative frequency and a cumulative frequency diagram and provides a chipping graph.

CANIN, Half Cell Potential Concrete Equipment | PCTE

Selectable grid with metric or imperial units. The basic configuration of the electrical circuit is shown in Fig. Degradation of concrete structures by corrosion processes is a serious problem and has major economic implications [3]. 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.

Readings are collected at a predetermined spacings automatically and stored. 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.

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XY-grid settings must be equal. Corrosion of steel in concrete is an electrochemical process.

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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but asrm not provided as part of the standard. 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.

Separately measured objects can be merged to a c876-911 potential map.

Asttm early detection can be a key in preventing an unanticipated structural failure. 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 results showed that reinforced concrete containing sugar cane bagasse ash has the lowest corrosion rates in comparison to reinforced concrete without the additive.

You need JavaScript enabled to view it. Brisbane e This email address is being protected from spambots. Comments about specific points on the concrete structure can be placed directly in the potential map. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered 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. 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. It c876-19 the identification of concrete corrosion before it becomes visible and has caused damage. Introduction Corrosion is the loss of material and occurs when metals are exposed to the environment.

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Single files can be opened and processed separately.

A potential field can be measured on the concrete surface by the aetm of an electrode, known as a half-cell, and a high-impedance voltmeter. All graphics can be exported as bmp-files into external software for the generation of reports. Reinforced concrete structures are exposed to. Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit. Firstly, accurate field corrosion potential measurements aid in detecting corrosion in rebars.

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

Perth Head Office e This email address is being protected from spambots. In service conditions, the concrete covering the steel bars gives physical and chemical protection to the reinforcement. Six AA batteries, 1. Concrete cover in excess of 3 in.

Once the alkaline environment is destroyed, the protective layer of oxide on the steel surface is destroyed and corrosion may start. Lecture Slides Our Products: