1、Designation:C63714Standard Specification forAggregates for Radiation-Shielding Concrete1This standard is issued under the fixed designation C637;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 pa
2、rentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope*1.1 This specification covers special aggregates for use inradiation-shielding concretes in which composition or highspecific gravity,or both,are of prime
3、 consideration.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 The following precautionary caveat pertains only to thetest method portion,Section 9,of this specification:Thisstandard does not purport to address all of the
4、 safety concerns,if any,associated with its use.It is the responsibility of the userof this standard to establish appropriate safety and healthpractices and determine the applicability of regulatory limita-tions prior to use.2.Referenced Documents2.1 ASTM Standards:2C33 Specification for Concrete Ag
5、gregatesC125 Terminology Relating to Concrete and Concrete Ag-gregatesC127 Test Method for Density,Relative Density(SpecificGravity),and Absorption of Coarse AggregateC128 Test Method for Density,Relative Density(SpecificGravity),and Absorption of Fine AggregateC131 Test Method for Resistance to Deg
6、radation of Small-Size Coarse Aggregate by Abrasion and Impact in the LosAngeles MachineC136 Test Method for Sieve Analysis of Fine and CoarseAggregatesC219 Terminology Relating to Hydraulic CementC535 Test Method for Resistance to Degradation of Large-Size Coarse Aggregate by Abrasion and Impact in
7、 the LosAngeles MachineC638 Descriptive Nomenclature of Constituents of Aggre-gates for Radiation-Shielding Concrete3.Terminology3.1 Definitions:3.1.1 For definitions of terms used in this standard,refer toTerminologies C125 and C219.4.Classification4.1 Aggregates covered by this specification inclu
8、de:4.1.1 Natural mineral aggregates of either high density orhigh fixed water content,or both.These include aggregates thatcontain or consist predominately of materials such as barite,magnetite,hematite,ilmenite,and serpentine.4.1.2 Synthetic aggregates such as iron,steel,ferrophospho-rus and boron
9、frit or other boron compounds(see DescriptiveNomenclature C638).4.1.3 Fine aggregate consisting of natural or manufacturedsand including high-density minerals.Coarse aggregate mayconsist of crushed ore,crushed stone,or synthetic products,orcombinations or mixtures thereof.5.Composition and Relative
10、Density(Specific Gravity)5.1 Table 1 gives data on chemical composition and relativedensity(specific gravity)of aggregate materials covered by thisspecification.5.2 The purchaser shall specify the minimum specific grav-ity for each size and type of aggregate.5.2.1 Uniformity of Specific GravityThe r
11、elative density(specific gravity)SSD(saturated surface-dry)of successiveshipments of aggregate shall not differ by more than 3%fromthat of the sample submitted for source approval tests.Theaverage specific gravity of the total shipment shall be equal toor greater than the specified minimum.5.3 The p
12、urchaser shall specify the minimum fixed watercontent of hydrous ores.If the design temperature,T,isdifferent from that given in 9.1.3.5,the purchaser shall specifythe value of T.5.3.1 Uniformity of Fixed Water ContentFor hydrousaggregates the fixed water content of successive shipments ofaggregate
13、shall not be less than 95%of the specified minimumvalue.The average fixed water content of the total shipmentshall be equal to or exceed the specified minimum value.1This specification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility
14、 of SubcommitteeC09.41 on Hydraulic Cement Grouts.Current edition approved June 1,2014.Published June 2014.Originallyapproved in 1969.Last previous edition approved in 2009 as C637 09.DOI:10.1520/C0637-14.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Serv
15、ice at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.U
16、nited States1 6.Aggregate Grading6.1 Sieve AnalysisFine and coarse aggregates for conven-tionally placed concrete shall be graded within the limits givenin Specification C33,except that with the approval of thepurchaser,as much as 20%of the material passing the 9.5-mm(38-in.)sieve may also pass the 150-m(No.100)sieve,withup to 10%passing the 75-m(No.200)sieve if the materialpassing the 75-m(No.200)sieve is essentially free of clay orshale.6.1.1 Fine and coarse aggregates for preplaced aggregatec