1、Designation:C18515aAmerican Association StateHighway and Transportation Officials StandardAASHTO No.:T137Standard Test Method forAir Content of Hydraulic Cement Mortar1This standard is issued under the fixed designation C185;the number immediately following the designation indicates the year oforigi
2、nal 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.This standard has been approved for use by agencies of the U.S.Department of Defen
3、se.1.Scope*1.1 This test method covers the determination of the aircontent of hydraulic cement mortar under the conditionshereinafter specified.1.2 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.3 Values in SI shall be obtaine
4、d by measurement in SIunits or by appropriate conversion,using the Rules for Con-version and Rounding in IEEE/ASTM SI 10,of measurementsmade in other units.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of th
5、is standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.1.5 WarningFresh hydraulic cementitious mixtures arecaustic and may cause chemical burns to skin and tissue uponprolonged exposure.22.Referenced Documents2.1 ASTM
6、 Standards:3C91 Specification for Masonry CementC109/C109M Test Method for Compressive Strength ofHydraulic Cement Mortars(Using 2-in.or 50-mm CubeSpecimens)C150 Specification for Portland CementC183 Practice for Sampling and the Amount of Testing ofHydraulic CementC185 Test Method for Air Content o
7、f Hydraulic CementMortarC230/C230M Specification for Flow Table for Use in Testsof Hydraulic CementC305 Practice for Mechanical Mixing of Hydraulic CementPastes and Mortars of Plastic ConsistencyC595 Specification for Blended Hydraulic CementsC778 Specification for SandC1005 Specification for Refere
8、nce Masses and Devices forDetermining Mass and Volume for Use in the PhysicalTesting of Hydraulic CementsC1157 Performance Specification for Hydraulic CementC1328 Specification for Plastic(Stucco)CementC1329 Specification for Mortar CementE438 Specification for Glasses in Laboratory ApparatusE694 Sp
9、ecification for Laboratory Glass Volumetric Appa-ratusIEEE/ASTM SI 10 Standard for Use of the InternationalSystem of Units(SI):The Modern Metric System3.Summary of Test Method3.1 Prepare a mortar with standard sand and the cement tobe tested,using a water content sufficient to give a requiredflow.Co
10、mpact the mortar into a measure of known volume anddetermine mass.Calculate the air content from the measureddensity of the mortar,the known densities of the constituents,and the mixture proportions.4.Significance and Use4.1 The purpose of this test method is to determine whetheror not the hydraulic
11、 cement under test meets the air-entrainingor non-air-entraining requirements of the applicable hydrauliccement specification for which the test is being made.The aircontent of concrete is influenced by many factors other than thepotential of the cement for air entrainment.5.Apparatus5.1 Flow Table,
12、Flow Mold,and Caliper,shall conform toSpecification C230/C230M.5.2 MeasureAcylindrical measure having an inside diam-eter of 76 6 2 mm and a depth(approximately 88 mm)1This test method is under the jurisdiction of ASTM Committee C01 on Cementand is the direct responsibility of Subcommittee C01.21 on
13、 Air Entrainment.Current edition approved Sept.1,2015.Published October 2015.Originallyapproved in 1944.Last previous edition approved in 2015 as C185 15.DOI:10.1520/C0185-15A.2Refer to the section on Safety Precautions,“Manual of Cement Testing,”Annual Book of ASTM Standards,Vol 04.01.3For referenc
14、ed 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 Summary of Changes section appears at the end of this standardCopyright ASTM
15、 International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 adjusted by standardization with water to contain 400 6 1 mLat 23.0 6 2.0C.For the purposes of this test,the capacity ofthe measure in millilitres is the mass of the water content of themeasure,in grams,d
16、ivided by 0.9976,no correction in massbeing made for the buoyant effect of air.The measure shallhave a uniform wall thickness.The thickness of the wall andbottom shall not be less than 2.9 mm.The total mass of theempty measure shall not be more than 900 g.The measure shallbe made of a metal not attacked by the cement mortar.5.3 VerificationVerify the volume of the 400 mL measureby filling with distilled water at 23.06 2.0C to a point wherethe meniscus extends appreciably above the top of the mea