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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Aggregate samples should be representative of the source. Pertinent background information, including results of prior testing, should be made available.
Petrographic Testing Methods | DRP Consulting
If the concrete in which the aggregate may be used will be exposed to freezing and thawing in a critically saturated condition, finely wstm 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.
If you need more info or have any questions, please note the Lab ID number 58 and contact us at: In situ chemical analysis. The values stated in each system may not be exact equivalents; therefore, each system shall be used independently of the other.
We most commonly perform the following tests: This is the industry standard throughout the world for investigating a multitude of problems. Potentially deleterious alkali-carbonate reactive rocks are usually calcareous dolomites or asym limestones with clayey insoluble residues.
This will ultimately destroy the concrete because such aggregates cannot be protected by adequately astk mortar. This examination identifies the rocks and minerals present in coarse and fine aggregates. 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 adtm protection against freeze-thaw damage.
Results Produced The detailed report includes: Adtm materials containing these constituents include: The petrographer’s advice and judgment should be sought regarding the extent of the examination.
Alkali-silica reactive constituents found in aggregates include: Time for Results Please contact a CTLGroup chemical services representative or Project Manager to discuss your individual project needs and testing response times. Materials that commonly find their way to our shop include: Referenced Documents purchase atsm The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Sample Type natural sand and gravel, drilled core, ledge rock, crushed stone, manufactured sand. Work Item s – proposed revisions of this standard. ASTM C qualitatively and quantitatively evaluates sieved aggregate for physical or mineralogical characteristics that may influence its performance in concrete.
Criteria are available for identifying the minerals in the list above by their optical properties or by XRD 23. 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.
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.
ASTM C also can be used to evaluate compliance of the bulk aggregate to local, state, or federal specifications for the project, for the presence and abundance of deleterious materials. Click here to see the standard. At least particles are identified for each sieve size in a gradation.
If you need more info or have any questions, please note the Lab ID number 58 and contact us at:. Criteria are available for identifying rocks by their mineral composition and texture 4. Use As part of assessing the quality of an aggregate source, ASTM C atm be required to determine if substances are present in the aggregate that are potentially deleterious to asm.
Flat, elongated, and thin chip-like particles in aggregate increase the mixing water astmm and hence decrease concrete strength.
Work at DRP varies widely in focus, scope and types of materials. Link to Active This link will always route to the current Active version of astn standard. 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.
Finely porous aggregates near the concrete surface are also likely to form popouts, which are blemishes on pavements and walls. Examination in both reflected and transmitted light may be necessary to provide data for these identifications. atm
ASTM C295/C295M – 12
Instructions Detailed report expressing composition and physical characteristics of the aggregate. Print and complete the following order form. Standard Guide for Petrographic Examination of Aggregates for Concrete This examination identifies the rocks and minerals present in coarse and fine aggregates.
Standard Practice for Petrographic Examination of Hardened Concrete This is the industry standard throughout the world for investigating a multitude of problems.
Aggregate constituents are described and classified, and relative percentages determined. Combining values from the two systems may result in non-conformance with the standard.
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. Sample mass should be sufficient to provide at least particles of each sieve size, with additional sample asrm for related tests.
This guide is based on Ref 1.
Order Form 2 Email complete form to contact listed below. 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.
However, as noted above, identification of every rock and mineral present in an aggregate source is not required. Historical Version s – view previous versions of standard.