ASTM_D_2872_-_12e1.pdf

Designation:D2872121Standard Test Method forEffect of Heat and Air on a Moving Film of Asphalt(RollingThin-Film Oven Test)1This standard is issued under the fixed designation D2872;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 parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1NOTEThis standard was corrected editorially in February 2013.1.Scope1.1 This test method is intended to measure the effect ofheat and air on a moving film of semi-solid asphaltic materials.The effects of this treatment are determined from measure-ments of the selected properties of the asphalt before and afterthe test.1.2 The values stated in inch-pound units are to be regardedas the standard.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 and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D113 Test Method for Ductility of Bituminous MaterialsD2171 Test Method for Viscosity of Asphalts by VacuumCapillary ViscometerE1 Specification for ASTM Liquid-in-Glass ThermometersE644 Test Methods for Testing Industrial Resistance Ther-mometersE1137/E1137M Specification for Industrial Platinum Resis-tance Thermometers3.Summary of Test Method3.1 A moving film of asphaltic material is heated in an ovenfor 85 min at 325F(163C).The effects of heat and air aredetermined from changes in physical test values as measuredbefore and after the oven treatment.An optional procedure isprovided for determining the change in sample mass.3.2 Precision values for this test method have been devel-oped for viscosity at 140F(60C);ductility at 60F(15.6C);and mass change.4.Significance and Use4.1 This test method indicates approximate change in prop-erties of asphalt during conventional hot-mixing at about302F(150C)as indicated by viscosity and other rheologicalmeasurements.It yields a residue which approximates theasphalt condition as incorporated in the pavement.If themixing temperature differs appreciably from the 302F(150C)level,more or less effect on properties will occur.Thistest method also can be used to determine mass change,whichis a measure of asphalt volatility.5.Apparatus5.1 OvenThis shall be a double-walled electrically heatedconvection-type oven.Its inside dimensions shall be 15 in.(381 mm)high,19 in.(483 mm)wide(including the plenum),and 1712612in.(445 6 13 mm)deep(with the door closed).The door shall contain a symmetrically located window withdimensions of 12 to 13 in.(305 to 330 mm)wide by 8 to 9 in.(203 to 229 mm)high.The window shall contain two sheets ofheat-resistant glass separated by an air space.The windowshould permit an unobstructed view of the interior of the oven.The top of the upper heating element shall be 1 618in.(25 63 mm)below the oven floor.5.1.1 The oven shall be vented at the top and bottom.Thebottom vents shall be located symmetrically to supply incom-ing air around the heating elements.They shall have an openarea of 2.31 6 0.11 in.2(15.0 6 0.7 cm2).The top vents shallbe symmetrically arranged in the upper part of the oven andhave an open area of 1.45 6 0.07 in.2(9.3 6 0.45 cm2).5.1.2 The oven shall have an air plenum covering the sidewalls and ceiling.The air space shall be 112in.(38.1 mm)deepfrom the walls and ceiling.At a midpoint in the width of theoven,and 6 in.(152.4 mm)from the face of the circular metalcarriage to its axis,a squirrel cage-type fan 514in.(133 mm)OD by 278in.(73 mm)wide shall be turned at 1725 rpm by anexternally mounted motor.The squirrel cage fan shall be set sothat the fan turns in an opposite direction to its vanes.The air1This test method is under the jurisdiction of ASTM Committee D04 on Roadand Paving Materials and is the direct responsibility of Subcommittee D04.46 onDurability and Distillation Tests.Current edition approved Aug.1,2012.Published August 2012.Originallyapproved in 1970.Last previous edition approved in 2004 as D2872 04.DOI:10.1520/D287212E01.2For 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 ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 flow characteristics of the fan-plenum system shall be suctionfrom the floor of the oven through the wall plenums andexhaust of the air through the fan.Fig.1 and Fig.2 showdetails of this plenum system.5.1.3 The oven shall be equipped with a proportionalcontrol thermostat capable of maintaining a temperature of325F(163C)to within 61.0F(60.5C).The sensingelement of the thermostat may be placed at any