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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ASTM C Petrographic Examination of Aggregates for Concrete | CTL
The petrographer’s advice and judgment should be sought regarding the extent of the examination. Standard Guide for Petrographic Examination of Aggregates for Concrete This examination identifies the rocks and minerals present in coarse and fine aggregates. 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. Flat, elongated, and thin chip-like particles in aggregate increase the mixing water requirement and hence decrease concrete strength.
ASTM C295/C295M – 12
Examination in both reflected and transmitted light may be necessary to provide data for these identifications. Combining values from the two systems may result in satm with the standard. 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.
Finely porous aggregates near the concrete surface are also likely to form popouts, which are blemishes on pavements and walls. Link to Active This link will always route to the current Active version of the standard.
At least particles are identified for each sieve size in a gradation. Order Form 2 Email complete form to contact listed below. 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.
Print and complete the following order form. 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. Sample mass should c2995 sufficient to provide at least particles of each sieve size, with additional sample mass for related tests.
The values stated in cc295 system may not be exact equivalents; therefore, each system shall be used independently of the other. If the concrete in which the aggregate may be atsm 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.
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. Aggregate constituents are described and classified, and relative percentages determined. 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.
ASTM C – 08 Standard Guide for Petrographic Examination of Aggregates for Concrete
If you need more info or have any questions, please note the Lab ID number 58 and contact us at: 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:.
The test method is also used for understanding mortar compositions in historical structures where preservation and restoration are the priority. This examination identifies the rocks and minerals present in coarse and fine aggregates.
Give us a call at 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.
This test is essential for understanding the aggregates that are used c259 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 xstm associated with iron sulfides.
Materials that commonly find their way to our shop include: However, as noted above, identification of every rock and mineral present in an aggregate source is not required.
In situ chemical analysis. Work at DRP varies widely in focus, scope and types of materials. Criteria are available for identifying rocks by their mineral composition and texture 4. Sample Type natural sand and gravel, drilled core, ledge rock, crushed stone, manufactured sand.