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. 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. ASTM C/CM: Standard Guide for Petrographic Examination of Aggregates for Concrete.
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Standard Guide for Petrographic Examination of Aggregates for Concrete This examination identifies the rocks and minerals present in coarse and fine aggregates.
Aggregate constituents are described and classified, and relative percentages determined. ASTM C also can be used to evaluate compliance of the bulk aggregate to local, ast, or federal specifications for the project, for the presence and abundance of deleterious materials.
ASTM C295/C295M – 12
Print and complete the following order form. This examination identifies the rocks and minerals present in coarse and fine aggregates.
Criteria are available for identifying the minerals in the list above by their optical properties or by XRD 23. Work Item s – proposed revisions of this standard. Click here to see the standard. Historical Version s – view previous versions of standard.
ASTM C / CM – 18 Standard Guide for Petrographic Examination of Aggregates for Concrete
Link to Active This link will always route to the current Active version of the standard. Work at DRP varies widely in focus, scope and types of materials.
This guide is based on Ref 1. Sample mass should be sufficient to provide at least particles of each sieve size, with additional sample mass for related tests. Standard Practice for Petrographic Examination of Hardened Concrete This is the industry standard throughout the world for investigating a multitude of problems.
At DRP we measure paste and aggregate content in addition to air content, which allows us to trouble-shoot concrete mixtures for strength issues as well as freeze-thaw durability issues.
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 astj use. Materials that commonly find their way to our shop include: This will ultimately destroy the concrete because such aggregates cannot be protected by adequately air-entrained mortar.
Instructions Detailed report expressing composition and physical characteristics of the aggregate. 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. Pertinent background information, including results of prior testing, should be made available. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
ASTM C/CM – 12 – Standard Guide for Petrographic Examination of Aggregates for Concrete
Flat, elongated, and thin chip-like particles in aggregate increase the mixing water requirement and hence decrease concrete strength. However, as noted above, identification of every rock and mineral present in an aggregate source is not required.
If you need more info or have any c29, please note the Lab ID number 58 and contact us at: The test method is also used for understanding mortar compositions in historical structures where preservation and restoration are the priority. Some dolomites essentially free of clay and some very fine-grained limestones free of clay and with minor insoluble residue, mostly quartz, are also capable of some alkali-carbonate reactions, however, such reactions are not necessarily deleterious.
At least particles are identified for each sieve size in a gradation. This test involves a combination of petrographic analysis per ASTM C and additional chemical analysis. Order Form 2 Email complete form to contact listed below. Use 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 potentially deleterious to concrete. In situ chemical analysis.
Petrographic examinations provide identification of types and varieties of rocks present in potential aggregates. Criteria are available for identifying rocks by their mineral composition and texture 4. This v295 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.
Aggregate materials containing these constituents include: Combining values from the two systems may result in non-conformance with the standard. Results Produced The detailed report includes: The petrographer’s advice and judgment should be sought regarding the extent of the examination. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. 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.
The test provides key information on not only how much air is present, but whether the size and spacing of the voids are suitable for providing protection against freeze-thaw damage. Alkali-silica reactive constituents found in aggregates include: If the concrete in which the aggregate may be used will be exposed to freezing and thawing in a critically axtm condition, 2c95 porous and highly weathered or otherwise altered rocks should be identified because they will be especially susceptible to damage by freezing and thawing and will cause the aggregate portion of the concrete to fail in freezing and thawing.