ASTM_C_1721_-_15.pdf

Designation:C172115Standard Guide forPetrographic Examination of Dimension Stone1This standard is issued under the fixed designation C1721;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This guide outlines procedures for the petrographicexamination of stone specimen material proposed for use asdimension stone used in construction.1.2 This guide outlines the extent to which petrographictechniques should be used,the selection of petrographic relatedproperties that should be looked for,and the manner in whichsuch techniques may be employed in the examination ofdimension stone.1.3 The rock and mineral names given in Terminology C119should be used,insofar as they are appropriate,in reportsprepared in accordance with this guide.1.4 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are provided forinformation purposes only.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C97 Test Methods for Absorption and Bulk Specific Gravityof Dimension StoneC99 Test Method for Modulus of Rupture of DimensionStoneC119 Terminology Relating to Dimension StoneC120 Test Methods of Flexure Testing of Slate(BreakingLoad,Modulus of Rupture,Modulus of Elasticity)C121 Test Method for Water Absorption of SlateC170 Test Method for Compressive Strength of DimensionStoneC217 Test Method for Weather Resistance of SlateC241 Test Method for Abrasion Resistance of Stone Sub-jected to Foot TrafficC406 Specification for Roofing SlateC503 Specification for Marble Dimension StoneC568 Specification for Limestone Dimension StoneC615 Specification for Granite Dimension StoneC616 Specification for Quartz-Based Dimension StoneC629 Specification for Slate Dimension StoneC880 Test Method for Flexural Strength of Dimension StoneC1353 Test Method for Abrasion Resistance of DimensionStone Subjected to Foot Traffic Using a Rotary PlatformAbraserC1526 Specification for Serpentine Dimension StoneC1527 Specification for Travertine Dimension StoneC1528 Guide for Selection of Dimension StoneC1799 Guide to Dimension Stone Test Specimen Samplingand PreparationE883 Guide for ReflectedLight Photomicrography3.Summary of Guide3.1 The specific procedures employed in the petrographicexamination of any specimen will depend to a large extent onthe purpose of the examination and the nature of the specimen.In most cases the examination will require the use of opticalmicroscopy.Complete petrographic examinations for particu-lar purposes and to investigate particular problems may requireexamination of selected constituents by means of additionalprocedures,such as X-ray diffraction(XRD)analysis forcrystalline structure,differential thermal analysis(DTA)forchemically and physically unstable minerals,infraredspectroscopy,scanning electron microscopy(SEM)energydispersive X-ray analysis(EDX),or other procedures.Al-though these procedures are beyond the scope of this standard,these additional procedures may be more definitive than visualmicroscopic methods.3.2 Identification of the minerals,composition,fabric,andstructure of a specimen is a necessary step towards recognitionof the properties that may be expected to influence the behaviorof the material in its intended use,but identification is not anend in itself.The value of any petrographic examination willdepend to a large extent on the representativeness of thespecimens examined,the completeness and accuracy of theinformation provided to the petrographer concerning the source1This guide is under the jurisdiction of ASTM Committee C18 on DimensionStone and is the direct responsibility of Subcommittee C18.01 on Test Methods.Current edition approved May 1,2015.Published July 2015.Originallypublished as C1721-09.Last previous edition approved in 2009 as C1721-09.DOI:10.1520/C1721-09.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 and proposed use of the material,and the petrographers abilityto correlate these data with the findings of the examination.3.3 This guide does not attempt to describe the techniquesof petrographic work since it is assumed that the guide will beused by persons who are qualified by education and experienceto employ such techniques for the recognition of