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ASTM D3791-04

(Practice)

Standard Practice for Evaluating the Effects of Heat on Asphalts

Standard Practice for Evaluating the Effects of Heat on Asphalts

SIGNIFICANCE AND USE
When asphalts are maintained at elevated temperatures in the presence of air, their characteristics may change. Certain blown asphalts also soften when maintained near, and particularly above, their final blowing temperatures under virtually air-free conditions. This may happen if the asphalt is overheated for application purposes. This practice provides a uniform heat-treatment procedure and methods for evaluating the effect of this treatment on some of the characteristics of asphalts. Changes observed when asphalts are overheated are not indicative of changes to be expected when asphalts are heated to normal application temperatures.
SCOPE
1.1 This practice covers a procedure for evaluating some of the effects on asphalts of heating in the presence of little or no air.  
1.2 This standard does not purport to address the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
31-Dec-2003
ICS
91.100.50 - Binders. Sealing materials
Technical Committee
D08 - Roofing and Waterproofing
Drafting Committee
D08.03 - Surfacing and Bituminous Materials for Membrane Waterproofing and Built-up Roofing
Current Stage
Ref Project

Relations

Replaces
ASTM D3791-96 - Standard Practice for Evaluating the Effects of Heat on Asphalts
Effective Date
01-Jan-2004
Replaced By
ASTM D3791/D3791M-04(2011)e1 - Standard Practice for Evaluating the Effects of Heat on Asphalts
Effective Date
01-May-2011

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ASTM D3791-04 - Standard Practice for Evaluating the Effects of Heat on Asphalts
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation:D3791–04
Standard Practice for
1
Evaluating the Effects of Heat on Asphalts
This standard is issued under the fixed designation D3791; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope exposureatthetesttemperaturechosenarethencomparedwith
those characteristics before exposure.
1.1 This practice covers a procedure for evaluating some of
the effects on asphalts of heating in the presence of little or no
NOTE 1—Asettemperatureisrequiredwhenthispracticeisusedaspart
air.
of a specification. Historically, a temperature of 204°C (400°F) has been
used.
1.2 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
5.1 When asphalts are maintained at elevated temperatures
priate safety and health practices and determine the applica-
inthepresenceofair,theircharacteristicsmaychange.Certain
bility of regulatory limitations prior to use.
blown asphalts also soften when maintained near, and particu-
2. Referenced Documents
larly above, their final blowing temperatures under virtually
2
air-free conditions. This may happen if the asphalt is over-
2.1 ASTM Standards:
heated for application purposes. This practice provides a
D5 Test Method for Penetration of Bituminous Materials
uniform heat-treatment procedure and methods for evaluating
D36 Test Method for Softening Point of Bitumen (Ring-
the effect of this treatment on some of the characteristics of
and-Ball Apparatus)
asphalts. Changes observed when asphalts are overheated are
D140 Practice for Sampling Bituminous Materials
not indicative of changes to be expected when asphalts are
D1079 TerminologyRelatingtoRoofingandWaterproofing
heated to normal application temperatures.
D2170 Test Method for Kinematic Viscosity of Asphalts
(Bitumens)
6. Apparatus
D2171 Test Method for Viscosity of Asphalts by Vacuum
6.1 Oven—A forced-ventilation oven conforming to the
Capillary Viscometer
requirements forType IIAas prescribed in Specification E145,
D4402 Test Method for Viscosity Determination ofAsphalt
capable of maintaining temperatures up to 300°C (572°F), and
at Elevated Temperatures Using a Rotational Viscometer
with a chamber at least 300 by 300 by 300 mm (12 by 12 by
E1 Specification for ASTM Liquid-in-Glass Thermometers
12 in.).
E145 Specification for Gravity-Convection and Forced-
6.2 Thermometer—ASTM Low-Distillation Thermometer,
Ventilation Ovens
having a range from −1 to+300°C (30 to 580°F) and
3. Terminology
conforming to the requirements forThermometers 7C or 7F as
prescribed in Specification E1.
3.1 Definitions—Definitions of terms used in this practice
6.3 Containers,triple-seal,friction-top,1-L(1-qt)and0.5-L
can be found in Terminology D1079.
(1-pt) cans with lids, free of any interior resinous or lacquer
3
4. Summary of Practice
coatings.
6.4 Laboratory Timer.
4.1 A sample of asphalt in a loosely covered container is
6.5 Hot Plate.
heated to a temperature chosen by the investigator for a period
of5h 610min.Certaincharacteristicsoftheasphaltafterheat
7. Sampling
7.1 Sample the asphalt in accordance with Practice D140.
1
ThispracticeisunderthejurisdictionofASTMCommitteeD08onRoofingand
WaterproofingandisthedirectresponsibilityofSubcommitteeD08.03onSurfacing
8. Test Specimen and Sample
and Bituminous Materials for Membrane Waterproofing and Built-Up Roofing.
8.1 Heat a minimum of 1 L (1 qt) of the asphalt on the hot
Current edition approved Jan. 1, 2004. Published January 2004. Originally
approved in 1979. Last previous edition approved in 1996 as D3791–96. DOI: plate. Stir occasionally to prevent local overheating. Keep
10.1520/D3791-04.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on “Triple-Tite” cans, available from Continental Can Co., 633 3rd Ave., New
the ASTM website. York, NY, or equivalent, have been found suitable.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D3791–04
coveredwheneverpossibletominimizevolatilesloss.Heatthe 9.3 Remove the container from the oven after 5 h. Remove
materialuntilsufficientlyfluidtopour,butinnocasemorethan the lid; if a skin is present, remove it carefully before allowing
93°C (200°F) above the softening point of the asphalt. the asphalt to cool. Stir the molten asphalt gen
...

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