ASTM D3791-96

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3791 – 96
Standard Practice for
Evaluating the Effects of Heat on Asphalts
This standard is issued under the fixed designation D 3791; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope of5h6 10 min. Certain characteristics of the asphalt after heat
exposure at the test temperature chosen are then compared with
1.1 This practice covers a procedure for evaluating some of
those characteristics before exposure.
the effects on asphalts of heating in the presence of little or no
air.
NOTE 1—A set temperature is required when this practice is used as part
1.2 This standard does not purport to address all of the of a specification. Historically, a temperature of 400°F has been used.
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-
priate safety and health practices and determine the applica- 5.1 When asphalts are maintained at elevated temperatures
in the presence of air, their characteristics may change. 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
2.1 ASTM Standards: air-free conditions. This may happen if the asphalt is over-
D 5 Test Method for Penetration of Bituminous Materials heated for application purposes. This practice provides a
D 36 Test Method for Softening Point of Bitumen (Ring- uniform heat-treatment procedure and methods for evaluating
and-Ball Apparatus) the effect of this treatment on some of the characteristics of
D 140 Practice for Sampling Bituminous Materials asphalts. Changes observed when asphalts are overheated are
D 1079 Terminology Relating to Roofing, Waterproofing, not indicative of changes to be expected when asphalts are
and Bituminous Materials heated to normal application temperatures.
D 2170 Test Method for Kinematic Viscosity of Asphalts
2 6. Apparatus
(Bitumens)
D 2171 Test Method for Viscosity of Asphalts by Vacuum 6.1 Oven—A forced-ventilation oven conforming to the
requirements for Type IIA as prescribed in Specification E 145,
Capillary Viscometer
D 4402 Test Method for Viscosity Determinations of Un- capable of maintaining temperatures up to 572°F (300°C), and
filled Asphalts Using the Brookfield Thermosel Apparatus with a chamber at least 12 by 12 by 12 in. (300 by 300 by 300
mm).
E 1 Specification for ASTM Thermometers
E 145 Specification for Gravity-Convection and Forced- 6.2 Thermometer—ASTM Low-Distillation Thermometer,
having a range from 30 to 580°F or from − 2 to + 300°C and
Ventilation Ovens
conforming to the requirements for Thermometers 7C or 7F as
3. Terminology
prescribed in Specification E 1.
3.1 Definitions—Definitions of terms used in this practice 6.3 Containers, triple-seal, friction-top, 1-qt (1-litre) and
can be found in Terminology D 1079. 1-pt (0.5-litre) cans with lids, free of any interior resinous or
lacquer coatings.
4. Summary of Practices
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
7. Sampling
7.1 Sample the asphalt in accordance with Practice D 140.
This practice is under the jurisdiction of ASTM Committee D-8 on Roofing,
Waterproofing, and Bituminous Materials and is the direct responsibility of
8. Test Specimen and Sample
Subcommittee D08.03 on Surfacing and Bituminous Materials for Membrane
8.1 Heat a minimum of 1 qt (1 litre) of the asphalt on the hot
Waterproofing and Built-U
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