ASTM_C_1524_-_02a_2010.pdf

Designation:C152402a(Reapproved 2010)Standard Test Method forWater-Extractable Chloride in Aggregate(Soxhlet Method)1This standard is issued under the fixed designation C1524;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 test method provides procedures for sampling andanalysis of aggregate for water-extractable chloride using aSoxhlet extractor.NOTE1This test method is to be used when significantly high chloridecontent has been found in aggregates,concretes,or mortars.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 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:2C114 Test Methods for Chemical Analysis of HydraulicCementC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1152/C1152M Test Method for Acid-Soluble Chloride inMortar and ConcreteC1218/C1218M Test Method for Water-Soluble Chloride inMortar and ConcreteD75 Practice for Sampling AggregatesD1193 Specification for Reagent WaterE11 Specification for Woven Wire Test Sieve Cloth and TestSieves2.2 American Concrete Institute Standard:ACI 222.196 Provisional Standard Test Method for Water-Soluble Chloride Available for Corrosion of EmbeddedSteel in Mortar and Concrete Using the Soxhlet Extractor33.Significance and Use3.1 Water-extractable chloride,when present in sufficientamount,has a potential to initiate or accelerate corrosion ofmetals,such as steel,embedded in or contacting a cementitioussystem,such as mortar,grout,or concrete.This test method isapplicable when aggregates contain a high background ofnaturally occurring chloride(see ACI 222.196).Test MethodC1152/C1152M determines acid-soluble chloride and TestMethod C1218/C1218M determines water-soluble chloride.Both Test Methods C1152/C1152M and C1218/C1218M pul-verize the sample to a fine powder or fine granular material.The Soxhlet method is intended to use nonpulverized material.Results with some aggregates have shown that the Soxhletprocedure extracts an extremely low amount of chloride,withmost of it remaining in the rock,and therefore,it is notavailable for corrosion.3.2 The Soxhlet extraction apparatus consists of three sec-tions:the boiling flask,which contains reagent water at thebeginning of the test;the extractor,which contains the sampleinside a thimble;and,the condenser.The extractor functions byboiling the water,which condenses and drips on to the sample.When the water attains a fixed height above the sample,theextractor siphons the water from the thimble back to the boilingflask.The process repeats itself until the test is terminated.(Refer to Fig.1.)4.Apparatus4.1 Sampling Equipment:4.1.1 The apparatus required for obtaining aggregatesamples is described in Practice D75.4.2 Sampling Processing Apparatus,the same as in TestMethod C1218/C1218M without pulverization.4.3 Soxhlet Extractor Apparatus,shall have the followingminimum size and consist of the following(see Fig.1).4.3.1 Reflux-Type Condenser,with a 34/45-mm ground-glass fitting to the extractor,and having a 27-mm insidediameter by a 192-mm body length.1This test method is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.69 on Miscellaneous Tests.Current edition approved Dec.1,2010.Published March 2011.Originallyapproved in 2002.Last previous edition approved in 2002 as C1524 02a.DOI:10.1520/C1524-02AR10.2For 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.3Available from American Concrete Institute(ACI),P.O.Box 9094,FarmingtonHills,MI 48333-9094,http:/www.concrete.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.3.2 Soxhlet Extraction Tube,with a 34/45-mm ground-glass fitting to the condenser and a 24/40-mm ground-glassfitting to the boiling flask,for holding sample thimbles 25 mmby 80 mm(diameter by height).4.3.3 A250-mLboiling flask with a 24/40-mm ground-glassfitting.4.3.4 A heating mantel,burner,or hot plate configured forthe flask capable of attaining 200C.4.3.5 Suitable Sample Holder,such as a porous extractionthimble having a 25-mm inside diameter and 80-mm externallength.4.4 The apparatus required for the chloride determinationstep is given in the