Baixe grátis o arquivo ASTM CCM – 12 _ Microscopical Determination of Parameters of the Air-Void System in Hardened Concrete (2).pdf enviado por. This standard is issued under the fixed designation C ; the number concrete. 1 This practice is under the jurisdiction of ASTM Committee C-9 on Concrete. Humboldt’s Linear Traverse Machine for concrete air void testing facilitates the counting of microscopic voids in concrete. Meets or exceeds ASTM C

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Users of this standard are expressly adtm that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

If you need more info or have any adtm, please note the Lab ID number 56 and contact us at: If scaling and suspected freeze-thaw distress is the issue, or if delamination is the suspected problem, the samples need to contain the finished top surface.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Use of ultrasonic cleaners may be harmful to the surface. Use The test is a quantitative method that measures the air-void content and other air-void system parameters in hardened concrete.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. The data gathered are the linear distance between stops along the traverse Ithe total number of stops Stthe number of stops in air voids Sathe number of stops in paste Spand the number of air voids N intersected by the line of traverse over which the component data is gathered.

Consequently, utmost care must be taken in conducting either microscopical method to observe and record. A Includes all data—all labs and all operators. Combining values from the two systems may result in non-conformance with the standard. The ratio of the volume of aggregate to the volume of paste in the original mix must be accurately known or estimated to permit the calculation of the air-void systems parameters from the microscopically determined paste-air ratio.

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A Includes determinations using both point count and linear traverse. The CTLGroup contacts can assist with questions about sample size and number of samples.

Historical Version s – view previous versions of standard. In such instances the usual procedure must be changed, and the paste-air ratio modification must be used see 5.

B These numbers represent, respectively, the 1s and D2s limits as described in Practice C Three procedures are described:. A surface that is satisfactory for microscopical examination will show an excellent reflection of a distant light source when viewed at a low incident angle and there shall be no noticeable relief between the paste and the aggregate surfaces. Juliano row Enviado por: The flash point of the lubricant may be found by use of Test Method D Any such distinction is arbitrary, because the various types of voids intergrade in size, shape, and other characteristics.

They occur also immediately below surfaces that were compacted by finishing operations before the completion of bleeding.

ASTM C457.C457M – 12 – Microscopical Determination of Parameters of the Air-Void…

They occur also immediately below surfaces that were compacted by finishing operations before the completion of bleeding.

Such treatment should not be used without care and experimentation. Paste content determinations were made by 13 operators representing 8 different laboratories. Originally approved in An increase in the water-cement ratio or the paste content must be accompanied by an increase in the air content, if the spacing asgm.

Individual sections should be as large as can be ground and aetm with the available equipment. Cleaning with a soft cosmetic brush under running water, or by a pressurized dental spray has been successful. Includes both point count and linear traverse data.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The honey-combing that is a consequence of the failure to compact the concrete properly is one type of entrapped air void 9, Eleven were by point count and 2 by linear traverse procedures. Results can also be applied to other situations in which the air content of concrete is in question.

Parte 1 de 4 Designation: The ratio of the volume of aggregate to the volume of paste in the original mix must be accurately known or estimated to permit the calculation of the air-void systems parameters from the microscopically determined paste-air ratio.

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In such instances the following procedure is helpful. These points may be in one or more planes intersecting the sample.

Air Void Testing for Concrete, ASTM C

The required area may consist of more than one prepared section. The parameters determined by this procedure are most often related to the susceptibility of the concrete to freezing and thawing damage. Because Procedure C requires darkening the paste and aggregate, its use must occur after other tests if the analyst is also gathering petrographic data in addition to the measurements described in this test method. They are most common beneath horizontal reinforcing bars, pieces of coarse aggregate and as channelways along their sides.

ASTM C Microscopical Determination of the Air-Void System | CTL Grp

Reviews in Engineering Geology, Geol. Instructions A 3 to 4- inch diameter core, about 4 to 6 inches long is typically needed to process a sufficient test area in accordance with the test method, depending on the top size of the aggregate. C47 to Active This link will always route to the current Active version of the standard.

Order Form 2 Email complete form to contact listed below. The selection of which one of the three methods to be used shall be subject to agreement of the user and provider of the determination. If this cannot be avoided. If only the air content is desired, only Ta and Tt need be asttm. A watervoid is usually identified by its irregular shape or evidence that a channel or cavity has been created by bleed water trapped in the concrete at the time it hardened.

Open Cup Tester 2. A Modified Point Count: However, significant differences may be observed if the sample of fresh concrete is consolidated to a different degree than the specimen later examined microscopically. Concrete and Concrete Aggregates and is the direct responsibility of Awtm C For specific hazard statements see 8.

In all, 19 operators participated with a total of 41 determinations on each specimen.