1、Designation:D7870/D7870M13Standard Practice forMoisture Conditioning Compacted Asphalt MixtureSpecimens by Using Hydrostatic Pore Pressure1This standard is issued under the fixed designation D7870/D7870M;the number immediately following the designation indicates theyear of original adoption or,in th
2、e case of revision,the year of last revision.A number in parentheses indicates the year of lastreapproval.A superscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice includes procedures for preparing com-pacted asphalt mixture specimens,exposin
3、g the specimens tohydrostatic pore pressure inside an enclosed chamber andguidance on testing the specimens for the effect of water on thetensile strength or change in other properties of the asphaltmixture,such as density,modulus,etc.1.2 Specimens conditioned according to this practice can betested
4、 using methods and test procedures referenced in thisdocument and those results may provide information as to theeffect of the moisture conditioning of this practice on themoisture sensitivity of those mixtures.1.3 The text of this standard references notes and footnoteswhich provide explanatory mat
5、erial.These notes and footnotes(excluding those in tables and figures)shall not be consideredas requirements of the standard.1.4 The values stated in either SI units or inch-pound unitsare to be regarded separately as standard.The values stated ineach system may not be exact equivalents;therefore,ea
6、chsystem shall be used independently of the other.Combiningvalues from the two systems may result in non-conformancewith the standard.1.5 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 establi
7、sh appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D979 Practice for Sampling Bituminous Paving MixturesD1561 Practice for Preparation of Bituminous Mixture TestSpecimens by Means of California
8、 Kneading CompactorD2726 Test Method for Bulk Specific Gravity and Densityof Non-Absorptive Compacted Bituminous MixturesD3665 Practice for Random Sampling of Construction Ma-terialsD3666 Specification for Minimum Requirements for Agen-cies Testing and Inspecting Road and Paving MaterialsD4013 Pract
9、ice for Preparation of Test Specimens of Bitu-minous Mixtures by Means of Gyratory Shear Compactor(Withdrawn 2013)3D4867 Test Method for Effect of Moisture on AsphaltConcrete Paving MixturesD5361 Practice for Sampling Compacted Bituminous Mix-tures for Laboratory TestingD6752 Test Method for Bulk Sp
10、ecific Gravity and Densityof Compacted Bituminous Mixtures Using AutomaticVacuum Sealing MethodD6925 Test Method for Preparation and Determination ofthe Relative Density of Asphalt Mix Specimens by Meansof the Superpave Gyratory CompactorD6926 Practice for Preparation of Bituminous SpecimensUsing Ma
11、rshall ApparatusD6927 Test Method for Marshall Stability and Flow ofAsphalt MixturesD6931 Test Method for Indirect Tensile(IDT)Strength ofBituminous Mixtures2.2 AASHTO Standards:4AASHTO TP 79 Standard Method of Test for Determiningthe Dynamic Modulus and Flow Number for Hot MixAsphalt(HMA)Using the
12、Asphalt Mixture PerformanceTester(AMPT)3.Significance and Use3.1 This practice provides an accelerated conditioningmethod under cyclic loading.This system is capable ofoperating at higher than normal temperatures and creating porepressure within a compacted asphalt mixture to achieve an1This test me
13、thod is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.22 onEffect of Water and Other Elements on Bituminous Coated Aggregates.Current edition approved June 1,2013.Published June 2013.DOI:10.1520/D7870_D7870M-132For refer
14、enced 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.3The last approved version of this historical standard is referenced onwww.a
15、stm.org.4Available from American Association of State Highway and TransportationOfficials(AASHTO),444 N.Capitol St.,NW,Suite 249,Washington,DC 20001,http:/www.transportation.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 acceleration
16、 of the effects that a mixture would experience overtime from traffic at normal temperatures and conditions.Theaccelerated conditioning in this practice is intended to simulatethe stresses induced in a wet pavement by a passing vehicletire.The pulse shape produced by this system approximates aLorentzian function with a half peak width of approximately 1s at 276 kPa 40 psi.3.2 The factors that influence the potential for moisturedamage to occur include aggregate mineralogy,mixture airvoids,water,