1、Designation:C64117Standard Test Method forIron Staining Materials in Lightweight Concrete Aggregates1This standard is issued under the fixed designation C641;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A
2、 number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope*1.1 This test method covers the testing of lightweightco
3、ncrete aggregates to evaluate the potential degree of stainingfrom iron compounds.1.2 The values stated in SI units are to be regarded as thestandard.The inch-pound values given in parentheses areprovided for information only.1.3 This standard does not purport to address the safetyproblems associate
4、d with its use.It is the responsibility of theuser of this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.1.4 This international standard was developed in accor-dance with internationally recognized principles on s
5、tandard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2C125 Terminology Relating to Concrete and Conc
6、rete Ag-gregatesC330/C330M Specification for Lightweight Aggregates forStructural ConcreteC331/C331M Specification for Lightweight Aggregates forConcrete Masonry UnitsC702/C702M Practice for Reducing Samples of Aggregateto Testing SizeD75/D75M Practice for Sampling AggregatesE11 Specification for Wo
7、ven Wire Test Sieve Cloth and TestSievesE832 Specification for Laboratory Filter Papers3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this test method,referto Terminology C125.4.Significance and Use4.1 This test method evaluates the potential degree ofstaining attributable to th
8、e presence of iron compounds in alightweight aggregate sample primarily by means of a visualclassification method.Such compounds may or may notproduce stains on the surface of the concrete in which theaggregate is incorporated.5.Apparatus5.1 BalanceAbalance or scale accurate to within 0.1%ofthe test
9、 load at any point within the range of use.5.2 Sieves9.5-mm(38-in.)and 600-m(No.30)sievesconforming to Specification E11.5.3 Filter Papershall comply with Specification E832class E2 with a minimum diameter of 240 mm.5.4 Cheesecloth WrappingTwo thicknesses,reagent gradecheesecloth,approximately 457 m
10、m(18 in.)square is sufficientfor wrapping each sample.5.5 Steam BathAny suitable apparatus that will meet therequirement of the test procedure.Water in the steam bath,andmakeup water,shall be iron-free water or distilled water.NOTE1An oven top glassware sterilizer made of nonferrous materialsis sati
11、sfactory.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregatesand is the direct responsibility of SubcommitteeC09.21 on Lightweight Aggregates and Concrete.Current edition approved June 15,2017.Published July 2017.Originallyapproved in 1969.Last previou
12、s edition approved in 2009 as C641 09.DOI:10.1520/C0641-17.2For 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.*A Summ
13、ary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in t
14、he Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Reagents6.1 Purity of ReagentsReagent grade chemicals shall beused in all tests.Unless otherwise indicated,it is int
15、ended thatall reagents shall conform to the specifications of the Commit-tee on Analytical Reagents of the American Chemical Society,where such specifications are available.36.2 Purity of WaterUnless otherwise indicated,referencesto water shall be understood to mean distilled water or water ofequal
16、purity.6.3 Concentration of Reagents:6.3.1 Concentrated Acid and Ammonium HydroxideWhenreagents are specified by name it shall be understood thatconcentrated reagents of the following specific gravity areintended:Hydrochloric acid(HCl)sp gr 1.19Ammonium hydroxide(NH4OH)sp gr 0.906.3.2 Diluted acid is described in terms of the number ofvolumes of the concentrated reagent to be added to a givennumber of volumes of water.Thus HCl(1+2)means 1 volumeof HCl(sp gr 1.19)added to 2 volumes of water.7.Sam