ASTM D6998-04

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Designation: D6998 – 04
Standard Practice for
Evaluating Aggregate Coating using Emulsified Asphalts
This standard is issued under the fixed designation D6998; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This practice covers those emulsified asphalts intended 4.1 The intent of this practice is to ensure that a given
for use by mixing with aggregate. It is not applicable to mixing grade emulsified asphalt is stable enough and otherwise
rapid-setting types or diluted materials used for tack coats, possesses the ability to mix with a reference stone for the
priming, or mulch treatments. prescribed time, and coat it uniformly and thoroughly.
1.2 This practice does not purport to address all of the
5. Apparatus and Material
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.1 Sieves—Standard 19.0-mm and 6.3-mm sieves con-
forming to Specification E11.
priate safety and health practices and determine the applica-
bility of regulatory limitations prior to use. 5.2 Spatula—A steel spatula or its equivalent, having a
blade approximately 200 mm in length.
2. Referenced Documents
5.3 Dish—A round-bottom iron dish or a kitchen saucepan,
2.1 ASTM Standards: of approximately 1 L capacity.
E11 Specification forWovenWireTest Sieve Cloth andTest 5.4 Stone—A supply of reference stone (hard limestone,
Sieves trap rock, or other type) which has been washed with water and
dried before using. All stone shall pass through the standard
3. Sample Conditioning for Testing
19.0-mm sieve and not more than 5 % shall pass through the
3.1 All emulsified asphalts shall be properly stirred to
6.3-mm sieve.
achieve homogeneity.
NOTE 2—Each laboratory should select its own reference stone supply,
3.2 All emulsified asphalts with viscosity testing require-
the source of which is not apt to change; this is to obviate rapid changes
ments of 50°C shall be heated to 50 6 3°C in the original
in the character of reference stone used in any one laboratory, since the
sample container in a water bath or oven. The container should
extent of coating may be aggregate dependent.
be vented to relieve pressure. After the sample reaches 50 6
5.5 Balance, capable of weighing 1000 g to within 6 0.1 g.
3°C, stir the sample to achieve homogeneity.
3.3 Emulsified asphalts with viscosity testing requirements
6. Procedure
of 25°C should be
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