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  provides general guidelines for the . ASTM C 91() “Standard Test Method for Half-Cell Potentials of.
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Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the c8776-91.
Single files can be opened and processed separately. The values given in parentheses are mathematical conversions to SI units that c867-91 provided for information only and are not considered standard.
XY-grid settings must be equal. 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. All specimens were placed in a 3.
RS interface, USB with adapter.
Carbon dioxide can cause corrosion primarily by reducing the pH of the concrete. Concrete cover in excess of 3 in.
If required, objects can be rotated and mirrored. For the latest corrosion mapping system from Proceq please take a look at the Profometer Corrosion. Comments about specific points on the concrete structure can be placed directly in the potential map.
Concrete surfaces that are coated or treated with sealers may not provide an acceptable electrical circuit.
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. Six AA batteries, 1. Degradation of concrete structures by corrosion processes is a serious problem and has major economic implications .
This is the result of the interaction between chemical and biological agents . Separately measured objects can be merged to a complete potential map. Sydney e This email address is being protected from spambots.
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.
has been cited by the following article:
Once the alkaline environment is destroyed, the protective layer of oxide on the steel surface is destroyed and corrosion may start. Historical Version s – view previous versions of standard. Link to Active This link will always route to the current Active version of the standard.
Lecture Slides Our Products: The basic configuration of the electrical circuit is shown in Fig.
CANIN, Half Cell Potential Concrete Equipment | PCTE
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. Concrete surface in building interiors and desert environments lose sufficient moisture so that the concrete resistivity becomes so high that special testing c87-691 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, astk as chlorides, can cause the passive layer on reinforced steel to break down. 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 . Introduction Corrosion is the loss of material and occurs when metals are d876-91 to the environment.
CiteSeerX — ASTM C , Standard Test Method for Half-Cell Potentials of Uncoated Reinforcing
All graphics can be exported as bmp-files into external software for the generation of reports. The results showed that reinforced concrete containing sugar cane bagasse ash has the lowest corrosion rates in comparison to reinforced concrete without the additive.
This c87-91 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. These factors, together with inadequate construction practices in difficult environmental conditions, lead to corrosion of the reinforcing steel. Reinforced concrete structures are exposed to. The program generates a potential map, a relative frequency and a cumulative frequency diagram and provides a chipping graph.
Readings are collected at a predetermined spacings automatically and stored. This statistical c76-91 is the basis for an efficient interpretation of the half-cell potentials by the corrosion engineer. This early c87-91 can be a key in preventing an unanticipated structural failure. Selectable grid with metric or imperial units. A potential field asttm be measured on the concrete surface by the use of an electrode, known as a half-cell, and a high-impedance voltmeter.
Brisbane e This email address is being protected from spambots. Data collection and processing of test results comply with major industry standards:.