1、Designation:C124015Standard Specification forSilica Fume Used in Cementitious Mixtures1This standard is issued under the fixed designation C1240;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.Scope1.1 This specification covers silica fume for use in concreteand other systems containing hydraulic cement.1.2 In the cases of slurried or densified silica
3、 fume,performthe tests on the raw silica fume from which these products havebeen made.1.3 The units stated in SI are to be regarded as the standard.No other units of measurement are included in this standard.1.4 The following safety hazards caveat pertains only to thetest methods portions,Sections 1
4、0 19,of this specification:This standard does not purport to address all of the safetyconcerns,if any,associated with its use.It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use
5、.Read the material safety data sheets formaterials used.1.5 The text of this standard references notes and footnotesthat provide explanatory information.These notes and foot-notes(excluding those in tables)shall not be considered asrequirements of this standard.2.Referenced Documents2.1 ASTM Standar
6、ds:2C109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C114 Test Methods for Chemical Analysis of HydraulicCementC125 Terminology Relating to Concrete and Concrete Ag-gregatesC135 Test Method for True Specific Gravity of RefractoryMaterials b
7、y Water ImmersionC183 Practice for Sampling and the Amount of Testing ofHydraulic CementC185 Test Method for Air Content of Hydraulic CementMortarC219 Terminology Relating to Hydraulic CementC311/C311M Test Methods for Sampling and Testing FlyAsh or Natural Pozzolans for Use in Portland-CementConcre
8、teC430 Test Method for Fineness of Hydraulic Cement by the45-m(No.325)SieveC441/C441M Test Method for Effectiveness of Pozzolans orGround Blast-Furnace Slag in Preventing Excessive Ex-pansion of Concrete Due to the Alkali-Silica ReactionC494/C494M Specification for Chemical Admixtures forConcreteC60
9、4 Test Method for True Specific Gravity of RefractoryMaterials by Gas-Comparison PycnometerC670 Practice for Preparing Precision and Bias Statementsfor Test Methods for Construction MaterialsC1005 Specification for Reference Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTe
10、sting of Hydraulic CementsC1012/C1012M Test Method for Length Change ofHydraulic-Cement Mortars Exposed to a Sulfate SolutionC1069 Test Method for Specific Surface Area of Alumina orQuartz by Nitrogen AdsorptionC1157/C1157M Performance Specification for HydraulicCementC1437 Test Method for Flow of H
11、ydraulic Cement Mortar3.Terminology3.1 Definitions:3.1.1 silica fume,nvery fine pozzolanic material,com-posed mostly of amorphous silica produced by electric arcfurnaces as a by-product of the production of elemental siliconor ferro-silicon alloys(also known as condensed silica fumeand microsilica).
12、3.1.2 silica fume,densified,nsilica fume processed toincrease bulk density to facilitate handling and shipping.3.1.3 silica fume,undensified,nsilica fume in its raw,asproduced or as collected,unprocessed form.3.1.4 Other terms in this specification are defined in Termi-nologies C125 and C219.1This s
13、pecification is under the jurisdiction of ASTM Committee C09 onConcrete and Concrete Aggregates and is the direct responsibility of SubcommitteeC09.24 on Supplementary Cementitious Materials.Current edition approved June 15,2015.Published September 2015.Originallyapproved in 1993.Last previous editi
14、on approved in 2014 as C1240 14.DOI:10.1520/C1240-15.2For 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 AST
15、M International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Ordering Information4.1 The purchaser shall specify any optional chemical orphysical requirements.5.Chemical Composition5.1 Silica fume shall conform to the requirements forchemical composition prescri
16、bed in Table 1.6.Physical Requirements6.1 Silica fume shall conform to the physical requirementsprescribed in Table 2.Optional physical requirements are givenin Table 3.7.Sampling7.1 When the purchaser desires that the silica fume besampled and tested to verify compliance with this specification,perform the sampling and testing in accordance with PracticeC183,modified as described in 7.3.NOTE1Exercise caution in the interpretation of Practice C183,sincethere is a difference between the continuou
