ASTM C295 PDF

This standard is issued under the fixed designation C ; the number 1 This guide is under the jurisdiction of ASTM Committee C09 on Concrete and. As part of assessing the quality of an aggregate source, ASTM C may be required to determine if substances are present in the aggregate that are. ASTM C/CM: Standard Guide for Petrographic Examination of Aggregates for Concrete.

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Click here to see the standard. This test is essential for understanding the aggregates that are used to produce concrete and can be the only method capable of detecting components that may have adverse reactions from alkali-aggregate reactions, freeze-thaw damage, or other mechanisms such as popouts and sulfuric acid attack associated with iron sulfides.

It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

This test involves a combination of petrographic analysis per ASTM C and additional chemical analysis. Finely porous aggregates near the concrete surface are also likely to form popouts, which are blemishes on pavements and walls. This will ultimately destroy the concrete because such aggregates cannot be protected by adequately air-entrained mortar. The agreement may stipulate specific determinations to be made, observations to be reported, funds to be obligated, or a combination of these or other conditions.

Accredited Materials Testing Laboratory

This examination identifies the rocks and minerals present in coarse and fine aggregates. Work C2295 s – proposed revisions of this standard. Flat, elongated, and thin chip-like particles in aggregate increase the mixing water astmm and hence decrease concrete strength. Aggregate constituents are described and classified, and relative percentages determined. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine awtm applicability of regulatory limitations prior to use.

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This will ultimately destroy the concrete because such aggregates cannot be protected by adequately astk mortar.

At least particles are identified for each sieve size in a astj. The petrographer’s advice and judgment should be sought regarding the extent of the examination.

At least particles are identified for each sieve size in a gradation. This examination identifies the rocks and minerals present in coarse and fine aggregates. Medias this blog was made to help people to easily download or read PDF files. Instructions Detailed report expressing composition and physical characteristics of the aggregate.

ASTM C Petrographic Examination of Aggregates for Concrete | CTL

Standard Practice for Petrographic Examination of Hardened Concrete This is the industry standard throughout the world for investigating a multitude of problems. We most commonly perform the following tests: Print and complete the following order form.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Historical Version s – view previous versions of standard. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.

Alkali-silica reactive constituents found in aggregates include: Sample Type natural sand and gravel, drilled core, ledge rock, crushed stone, manufactured sand. Petrographic examinations provide identification of types and varieties of rocks present in potential aggregates.

Materials that commonly find their way to our shop include: Astj are available for identifying rocks by their mineral composition and texture 4. ASTM C qualitatively and quantitatively evaluates sieved aggregate for physical or mineralogical characteristics that may influence its performance in concrete.

ASTM C – 98 Standard Guide for Petrographic Examination of Aggregates for Concrete

Click here to see the standard. If you need more info or have any questions, please note the Lab ID number 58 and contact us at:. Results Produced The detailed report includes: Sample mass should be sufficient to provide at least particles of each sieve size, with additional sample mass for related tests. In such a case, the purchaser and the consultant should together determine the kind, extent, and objectives of the examination and analyses to be made, and should record their agreement in writing.

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The employer should tell the petrographer, in as much detail as necessary, the purposes and objectives of the examination, the kind of information needed, and the extent of examination desired.

If you need more info or have any questions, please note the Lab ID number 58 and contact us at: Time for Results Please contact a CTLGroup chemical services representative or Project Awtm to discuss your individual project needs and testing response times. Give us a call at Pertinent background information, including results of prior testing, should be made available.

Test Methods

Criteria are available for identifying the minerals in the list above by their optical properties or by XRD 23. In situ chemical analysis. Potentially deleterious alkali-carbonate reactive rocks are usually calcareous dolomites or dolomitic limestones with clayey insoluble residues. Pertinent background information, including results of prior testing, should be made available. This test is essential for understanding the aggregates that are used to produce concrete and can be the only method capable of detecting components that may have adverse reactions from alkali-aggregate reactions, freeze-thaw damage, or other mechanisms such as popouts and sulfuric acid attack associated with iron sulfides.

Flat, elongated, and thin chip-like particles in aggregate increase the mixing water requirement and hence decrease concrete strength.

In such a case, the purchaser and the consultant should together determine the kind, extent, and objectives of the examination and analyses to be made, and should record their agreement in writing.

Aggregate samples should be representative of the source.