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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However, as noted above, identification of every rock and mineral present in an aggregate source is not required.
Alkali-silica reactive constituents found in aggregates include: If you need more info or have any questions, please note the Lab ID number 58 and contact us at: Work Item s – proposed revisions of this standard. 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. Aggregate constituents are described and classified, and relative percentages determined.
Potentially deleterious alkali-carbonate reactive rocks are usually calcareous dolomites or dolomitic limestones with clayey insoluble residues. 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. If you need more info or have any questions, please note the Lab ID number 58 and contact us at:.
Give us a call at Sample Type natural sand and gravel, drilled core, ledge rock, crushed stone, manufactured sand. Aggregate samples should be representative of the source.
ASTM C295/C295M – 12
Criteria are available for identifying the minerals in the list above by their optical properties or by XRD 23. This is the industry standard throughout the world for investigating a multitude of problems. Print and complete the following order form.
Click here to see 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.
Historical Version s – view previous versions of standard.
Flat, elongated, and thin chip-like particles in aggregate increase the mixing water requirement and hence decrease concrete strength. Materials that commonly find their way to our shop include: If the concrete in which the aggregate may be used will be exposed to freezing and thawing in a critically saturated condition, finely porous and highly weathered or otherwise altered rocks should be identified because they will be especially susceptible to damage by freezing and ast and will cause the aggregate portion of axtm concrete to fail in freezing and thawing.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the 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.
ASTM C qualitatively and quantitatively evaluates sieved aggregate for physical or mineralogical characteristics that may influence its performance in concrete.
ASTM C – 08 Standard Guide for Petrographic Examination of Aggregates for Concrete
Work at DRP varies widely in focus, scope and types of materials. This guide is based on Ref 1. Examination in both reflected and transmitted light may be necessary to provide data for these identifications.
The test method is also used for understanding mortar compositions in historical structures where preservation and restoration are the priority. Criteria are available for identifying rocks by their mineral composition and texture 4. At least particles are identified for each sieve size in a gradation.
The petrographer’s advice and judgment should be sought regarding the extent of the examination. This test involves a combination of petrographic analysis per ASTM C and additional chemical analysis.
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. At DRP we measure paste and aggregate content in addition to air content, which allows us to asgm concrete mixtures for strength issues as well as freeze-thaw durability issues.
ASTM C – 98 Standard Guide for Petrographic Examination of Aggregates for Concrete
The employer should tell the petrographer, in as much detail as c25, the purposes and objectives of the examination, the kind of information needed, and the extent of examination desired. Sample mass should be sufficient to provide at least particles of each sieve size, with additional sample mass for related tests.
Results Produced The detailed report includes: