ASTM C876-91 PDF

Mar 25 2020

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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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 asstm, 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.

Single files can be opened and processed separately. For the latest corrosion mapping system from Proceq please take a look at the Profometer C8776-91.

Historical Version s – view previous versions of standard. Carbon dioxide can cause corrosion primarily by reducing the pH of the concrete. Brisbane e This email address is being protected from spambots. This early detection can be a key in preventing an unanticipated structural failure. If required, objects can be rotated and mirrored. Data collection and processing of test results comply with major industry standards:.

Readings are collected at a predetermined spacings automatically and stored. This enable the asttm to immediately mark on the concrete surface the areas of concern and to later down load the data for printing in a report.

Based on the user defined threshold potentials that represent certain conditions of the structure, up to four characteristic potential intervals can be chosen. 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.


Separately measured objects can be merged to a complete potential map. A potential field can be measured on the concrete surface by the use of an electrode, known as a ast, and a high-impedance voltmeter.

Sydney e Asmt email address is being protected from spambots.

CANIN, Half Cell Potential Concrete Equipment | PCTE

awtm Degradation of concrete structures by corrosion processes is a serious problem and has major economic implications [3]. All graphics can be exported as bmp-files into external software for the generation of reports. This statistical presentation is the basis for an efficient interpretation of the half-cell potentials by the corrosion engineer.

These factors, together with inadequate construction practices in difficult environmental conditions, lead to corrosion of the reinforcing steel. The values given in astn are mathematical conversions to SI units that are provided for information only and are not considered standard.

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

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

Concrete cover in excess of 3 in. Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit. 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].

Perth Head Office e This email address is being protected from spambots. All specimens were placed in a 3.

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Referenced Documents purchase separately The c8876-91 listed below are referenced within the subject standard but are not provided as part of the standard. Corrosion of steel in concrete is an electrochemical process.


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. You need JavaScript enabled to view it. The program generates a potential map, a relative frequency and a cumulative frequency diagram and provides a chipping graph.

It enables the identification of concrete corrosion before it becomes visible and has caused damage. Firstly, accurate field corrosion potential measurements aid in detecting corrosion in rebars. RS interface, USB with adapter. Introduction Corrosion is the loss of material and occurs when metals are exposed to the asm. This is the result of the interaction between chemical and biological agents [1]. Corrosion of reinforced steel has two principal problems that affect the service life of concrete reinforced structures [2].

Selectable grid with metric or imperial units. XY-grid settings must be equal. 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. Comments about specific points on the concrete structure can be placed directly in the potential map. C8776-91 service conditions, the concrete covering the steel bars gives physical and chemical protection to the reinforcement. 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.