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.
|Published (Last):||14 February 2011|
|PDF File Size:||14.17 Mb|
|ePub File Size:||11.82 Mb|
|Price:||Free* [*Free Regsitration Required]|
This examination identifies the rocks and minerals present in coarse and fine aggregates.
Examination in both reflected and transmitted light may be necessary to provide data asrm these identifications. Finely porous aggregates near the concrete surface are also likely to form popouts, which are blemishes on pavements and walls.
Potentially deleterious alkali-carbonate reactive rocks are usually calcareous dolomites or dolomitic limestones with clayey insoluble residues. However, as noted above, identification of every rock and mineral present in an aggregate source is not required.
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. Work at DRP varies widely in focus, scope and types of materials. ASTM Axtm qualitatively and quantitatively evaluates sieved aggregate for physical or mineralogical characteristics that may influence its asttm in concrete.
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. Alkali-silica reactive constituents found in aggregates include: Sample mass should be sufficient to c2295 at least particles of each sieve size, with additional sample mass for related tests. If you need more info or have any questions, please note atm Lab ID number 58 and contact us at: Work Item s – proposed revisions of this standard.
ASTM C – 08 Standard Guide for Petrographic Examination of Aggregates for Concrete
This will ultimately asrm the concrete because such aggregates cannot be protected by adequately air-entrained mortar. 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.
Standard Guide for Petrographic Examination of Aggregates for Concrete This examination identifies the rocks and minerals present in coarse and fine aggregates. ASTM C also can be used to evaluate compliance of the bulk aggregate to local, state, or federal specifications for the project, for c95 presence and asmt of deleterious materials.
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. Pertinent background information, including results of prior testing, should be made available.
Aggregate constituents are described and classified, and relative percentages determined. Click here to see the standard. 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 thawing and will cause the aggregate portion of the concrete to fail in freezing and thawing.
We most commonly perform the following tests: This test involves a combination of petrographic analysis per ASTM C and additional chemical analysis. Aggregate materials containing these constituents include: Flat, elongated, and thin chip-like particles in aggregate increase the mixing water requirement and hence decrease concrete strength.
ASTM C295/C295M – 12
Historical Version s – view previous versions of standard. This guide is based on Ref 1. 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.
Petrographic examinations provide identification of types and varieties of rocks present in potential asfm. If you need more info or have any questions, please note the Lab ID number 58 and contact us at:. 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.
Give us a call at Aggregate samples should be representative of the source. Combining values from the two systems may result in non-conformance with the standard. Print asfm complete the following order form. Criteria are available for identifying rocks by their mineral composition and texture 4. The petrographer’s advice and judgment should be sought regarding the extent of the examination.
Petrographic Testing Methods | DRP Consulting
Time for Results Please contact a CTLGroup chemical services representative or Project Manager to discuss your individual project needs and testing response times.