1、Designation:D63212Standard Specification forSodium Chloride1This standard is issued under the fixed designation D632;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
2、 of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This specification covers sodium chloride intended foruse as a deicer and for road construction or maintenancepurposes.1.2 The values stated as SI units are to be regarded as thes
3、tandard.1.3 For purposes of determining conformance to thisspecification,values for chemical analysis shall be rounded tothe nearest 0.1%,and values for grading shall be rounded tothe nearest 1%,in accordance with the rounding method inPractice E 29E29.1.4 The text of this specification references n
4、otes andfootnotes that provide explanatory material.These notes andfootnotes shall not be considered as requirements of thespecification.1.5 The following precautionary caveat pertains only to thetest method in Annex A1,of this specification:This standarddoes not purport to address all of the safety
5、 concerns,if any,associated with its use.It is the responsibility of the user of thisstandard to establish appropriate safety and health practicesand determine the applicability of regulatory limitations priorto use.2.Referenced Documents2.1 ASTM Standards:C136 Test Method for Sieve Analysis of Fine
6、 and CoarseAggregatesC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsE29 Practice for Using Significant Digits in Test Data toDetermine Conformance with SpecificationsE287 Specification for Laboratory Glass Graduated BuretsE288 Specification for La
7、boratory Glass Volumetric FlasksE534 Test Methods for Chemical Analysis of Sodium Chlo-ride3.Classification3.1 This specification covers sodium chloride obtained fromnatural deposits(rock salt)or produced by man(evaporated,solar,other)and recognizes two types and two grades asfollows:3.1.1 Type IUse
8、d primarily as a pavement deicer or inaggregate stabilization.3.1.1.1 Grade 1Standard grading(Note 1).3.1.1.2 Grade 2Special grading(Note 1).3.1.2 Type IIUsed in aggregate stabilization or for pur-poses other than deicing.NOTE1Grade 1 provides a particle grading for general application,and has been
9、found by latest research to be most effective for ice controland skid resistance under most conditions.Grade 2 is the grading typicalof salt produced in the Western United States and is available in states ofthe Rocky Mountains Region and west,which may be preferred bypurchasers in that area.4.Chemi
10、cal Requirements4.1 The sodium chloride shall conform to the followingrequirement for chemical composition,except for the tolerancestated in 6.1 and 6.2:Sodium chloride(NaCl),min,%95.05.Physical Requirements5.1 Grading:5.1.1 Type IThe grading of Type I sodium chloride,whentested by means of laborato
11、ry sieves conforming to Specifica-tion E 11,shall conform to the following requirements forparticle size distribution,except for the tolerance stated in 6.1and 6.1.1:Mass%PassingSieve SizeGrade 1Grade 219.0 mm(34in.).10012.5 mm(12in.)100.9.5 mm(38in.)95 to 100.4.75 mm(No.4)20 to 9020 to 1002.36 mm(N
12、o.8)10 to 6010 to 60600 m(No.30)0 to 150 to 151This specification is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.31 onCalcium and Sodium Chlorides and Other Deicing Materials.Current edition approved April 1,2012.Publi
13、shed April 2012.Originallyapproved in 1941.Last previous edition approved in 2001 as D632 01 which waswithdrawn in January 2010 and reinstated in April 2012.DOI:10.1520/D0632-12.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 5.1.2 Type I
14、IThe grading of Type II sodium chloride shallconform to the grading requirements imposed or permitted bythe purchaser under conditions of the intended use.6.Permissible Variations6.1 In the case of sodium chloride sampled after delivery tothe purchaser,tolerances from the foregoing specified valuess
15、hall be allowed as follows:6.1.1 Grading5 percentage points on the maximum valuefor the range for each sieve size,except the 12.5 mm(12in.)and 9.5 mm(38in.)for Grade 1 and 19.0 mm(34in.)for Grade2.6.1.2 Chemical Composition0.5 percentage point.7.Condition7.1 The sodium chloride shall arrive at the p
16、urchasersdelivery point in a free-flowing and usable condition.8.Sampling8.1 Not less than three sample increments shall be selectedat random from the lot(Note 2).Each increment shall beobtained by scraping aside the top layer of material to a depthof at least 25 mm(1 in.)and taking a 500-g(approximately1-lb)quantity of sodium chloride to a depth of at least 150 mm(6 in.).Sampling shall be done by means of a sampling thief orother method that will ensure a representative cross section ofthe mate
