ASTM D6998-11

This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been made to the previous version. Because
it may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current version
of the standard as published by ASTM is to be considered the official document.
Designation:D6998–04 Designation: D6998 – 11
Standard Practice for
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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
1.1 This practice covers those emulsified asphalts intended for use by mixing with aggregate. It is not applicable to rapid-setting
types or diluted materials used for tack coats, priming, or mulch treatments.
1.2
1.2 The values stated in SI are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This practice does not purport to address all of 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.
2. Referenced Documents
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2.1 ASTM Standards:
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
3. Sample Conditioning for Testing
3.1 All emulsified asphalts shall be properly stirred to achieve homogeneity.
3.2 All emulsified asphalts with viscosity testing requirements of 50°C shall be heatedconditioned to 50 6 3°C in the original
a sample container in a water bath or oven.The container should be vented to relieve pressure.After the sample reaches 50 6 3°C,
stir the sample to achieve homogeneity.
3.3 Emulsified asphalts with viscosity testing requirements of 25°C shouldshall be mixed or stirred at conditioned to 25 6 3°C
in the original a sample container to achieve homogeneity. the sample reaches 25 6 3°C, stir the sample to achieve homogeneity.
NOTE 1—Emulsified asphalts with viscosity testing requirements of 25°C may be heated and stirred as specified in 3.2, if necessary. In the event the
3.2 method is used, the sample should be cooled to 25 6 3°C.
4. Significance and Use
4.1 The intent of this practice is to ensure that a given mixing grade emulsified asphalt is stable enough and otherwise possesses
the ability to mix with a reference stone for the prescribed time, and coat it uniformly and thoroughly.
5. Apparatus and Material
5.1 Sieves—Standard 19.0-mm and 6.3-mm sieves conforming to Specification E11.
5.2 Spatula—A steel spatula or its equivalent, having a blade approximately 200 mm in length.
5.3 Dish—A round-bottom iron dish or a kitchen saucepan, of approximately 1 L capacity. Mixing Container—A container of
approximately 1 L capacity (for example, round bottom iron dish, kitchen saucepan, pie tin, stainless steel bowl).
5.4 Stone—Asupply of reference stone (hard limestone, trap rock, or other type) which has been washed with water and dried
before using.All stone s
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