1、Designation:D 4013 98Standard Practice forPreparation of Test Specimens of Bituminous Mixtures byMeans of Gyratory Shear Compactor1This standard is issued under the fixed designation D 4013;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revi
2、sion,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.1.Scope1.1 This practice covers the preparation of 10-cm or 4-in.diametertestspecimensofbituminousmixturescontaining
3、 22.4-mm(78-in.)aggregate.1.2 The values stated in SI units are to be regarded asstandard.1.3 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 establish appro-priate safety and health practices
4、and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:E 4 Practices for Load Verification of Testing Machines23.Summary of Practice3.1 This practice employs gyratory-shearing action of themixture at low initial pressures,allowing orientation
5、 of theaggregate particles to aid compaction,and then nongyratorycompression at high pressure for consolidation and shaping.4.Significance and Use4.1 The specimens are compacted to simulate the density,aggregate degradation,and structural characteristics possible inthe actual road surface when prope
6、r construction procedure isused in the placement of the material.The specimens may beused to determine stability,density,strength,water suscepti-bility,etc.,of bituminous mixtures by specified test methods.5.Apparatus5.1 Gyratory-Shear Molding Press:5.1.1 Press Platen,which is hardened and ground fl
7、at.5.1.2 Hydraulic Compaction Ram,with nonrotating metalface as shown in Fig.1 and Fig.2.The ram face is hardenedand ground flat.The ram varies the vertical opening betweenthe ram face and the press platen from+11 cm(4.5 in.)downto less than 2.5 cm(1.0 in.).5.1.3 Low-Pressure Gage,with automatic val
8、ve for highpressure protection and with a capability of indicating within62 kPa(60.3 psi)the following:(See Note 1):5.1.3.1 Pregyration Stress219 kPa(31.8 psi),which is1779 N(400 lbf)total for 10-cm or 4-in.diameter specimens.5.1.3.2 End Point Stress 657 kPa(95.3 psi),which is5338 N(1200 lbf)total f
9、or 10-cm or 4-in.diameter specimens.5.1.4 High-Pressure Gage,with capability of indicatingwithin 6110 kPa(616 psi)the following:(See Note 1):5.1.4.1 Consolidation Stress11.0 MPa(1590 psi),whichis 89 kN(20 000 lbf)total for 10-cm or 4-in.diameterspecimens.5.1.5 Tilt Mechanism,to cock the mold 6 while
10、 thespecimen is under pregyration stress(see 5.1.3.1).In reversemanner,it squares the mold axially against the press platen,with a smooth quick motion.5.1.6 Gyration Mechanism,to move the mold about the ramface 12 total angle and produce gyratory shear compaction ofthe specimen.An electric motor dri
11、ves the gyration mechanismat approximately 1 s/cycle.5.1.7 Count Mechanism,to shut the gyration motor off afterthree complete cycles and to stop it in the loading position withan electric brake.5.1.8 Hydraulic Hand Pump,which meters 0.51-mm(0.020-in.)ram movement,with a smooth quick motion.5.2 Gyrat
12、ory Mold Rigid metal mold as shown in Fig.1and Fig.3,with a concentric hardened ring for manipulatinggyratory action,and hardened to at least 55 HRC honed andhard-plated interior.5.3 Base PlateSolid metal plate as shown in Fig.1 andFig.2.Top and bottom surfaces are hardened and ground flat.(See Tabl
13、e 1 for a comparison of dimensions.)5.4 Wide-Mouth Funnel,with mouth that fits inside mold.5.5 Scale or Balance,having at least 4500-g capacity,sensitive to 0.1 g.5.6 Sieve or Screen A 25-mm(1-in.)screen or 22.4-mm(78-in.)sieve.5.7 SpatulaA flexible spatula having a blade about 100mm(4 in.)long and
14、20 mm(34in.)wide.5.8 SpoonA large spoon with a right angle bend betweenthe bowl and handle.5.9 Measuring Device A micrometer dial assembly orcalipers for determining the height of the specimens is suitablefor this purpose.1This practice is under the jurisdiction of ASTM Committee D-4 on Road andPavi
15、ng Materials and is the direct responsibility of Subcommittee D04.26 onFundamental/Mechanistic Tests.Current edition approved January 10,1998.Published February 1999.Originallypublished as D 401381.Last previous edition D 401381(1993).2Annual Book of ASTM Standards,Vol 03.01.1AMERICAN SOCIETY FOR TE
16、STING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTM5.10 Specimen Extrusion DeviceA rigid right cylinder,having a minimum height of 115 mm(412in.),and a diameterof approximately 98 mm(378in.)to be used as a pedestal witha converted arbor press or some similar device.Other methodsof specimen extrusion that do not damage the specimen may beused.5.11 Oven,for specimen mixtures and mold assemblieshaving a range from 38 to 15
