ASTM C457 PDF

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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The required area may consist of more than one prepared section.

The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other. Open Cup Tester 2. For specific hazard statements see Note 9 and Note Privacy Policy Sensors Sitemap. Such compressive strength must be at least 28 MPa [ psi]. Such treatment should not be used without care and experimentation.

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

ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard. BoxFarmington Hills, MIhttp: 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 Note 1: Friable particles of aggregate can also cause difficulty.

The honey-combing that is a consequence of the failure to compact the concrete properly is one type of entrapped air void 9, If you need more info or have any questions, please note the Lab ID number 56 and contact us at: Order Form 2 Email complete form to contact listed below. Juliano row Enviado por: Cleaning with a soft cosmetic brush under running water, or by a pressurized dental spray has been successful.

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For voids per in.: From these data the air content and various parameters of the air-void system are calculated.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below. Hence, substantial differences in spacing factor may be caused solely by sampling and between laboratory variation.

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

The data gathered are the zstm 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 asfm. Areas that are scratched or imperfect indicate the need for additional preparation; use special techniques if required see 8.

Results can also be applied to other situations in which the air content of concrete is in question. Work Item s – proposed revisions of this standard. 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.

Link to Active This link will always route to the current Active version of the standard. 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.

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ASTM CCM – 12 – Microscopical Determination of Parameters of the Air-Void

When assessing strength problems it is helpful to comparatively analyze acceptable and low strength samples. No further reproductions authorized. Time for Results Please contact a CTLGroup chemical services representative or Project Manager to discuss your individual project needs and testing response times.

Hence, this test method can be used to develop data to estimate the likelihood of damage due to cyclic freezing and thawing or to explain why it has occurred.

Somewhat larger values may be adequate for mild exposure, and smaller ones may be required for severe exposure, especially if the concrete is in contact with deicing chemicals.

For concrete with a relatively high air content usually over 7. Combining values from the two systems may result in non-conformance with the standard.

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.

Results Produced Numerical values for percent total air, spacing factor, specific surface, number of voids per inch, paste-air ratio, and percent paste are reported.

Consequently, utmost care must be taken in conducting either microscopical method to observe and record. An appropriate series of abrasives would include nominal 75, 35, B Theoretical Standard Deviation: