ASTM D6998-19
(Practice)Standard Practice for Evaluating Aggregate Coating using Emulsified Asphalts
Standard Practice for Evaluating Aggregate Coating using Emulsified Asphalts
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.
Note 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors.
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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 This standard 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
- Status
- Published
- Publication Date
- 30-Nov-2019
- Technical Committee
- D04 - Road and Paving Materials
- Drafting Committee
- D04.42 - Emulsified Asphalt Test
Relations
- Replaces
ASTM D6998-11 - Standard Practice for Evaluating Aggregate Coating using Emulsified Asphalts - Effective Date
- 01-Dec-2019
- Effective Date
- 01-Oct-2016
- Effective Date
- 01-Dec-2013
- Effective Date
- 01-Oct-2013
- Effective Date
- 01-Dec-2011
- Effective Date
- 01-Dec-2009
- Effective Date
- 01-May-2009
- Effective Date
- 01-Aug-2007
- Effective Date
- 01-Aug-2007
- Effective Date
- 15-Jan-2007
- Effective Date
- 15-Jan-2007
- Effective Date
- 15-Jan-2007
- Effective Date
- 01-Jun-2006
- Effective Date
- 01-Jun-2005
- Effective Date
- 01-Feb-2005
Overview
ASTM D6998-19 is a recognized standard developed by ASTM International that provides a consistent practice for evaluating aggregate coating using emulsified asphalts. This method is specifically applicable to emulsified asphalts intended for mixing with aggregates, but it does not cover rapid-setting types or diluted materials used for tack coats, priming, or mulch treatments. The standard ensures that specified mixing grade emulsified asphalt demonstrates the ability to uniformly and thoroughly coat a reference aggregate under controlled procedures. It directly addresses the requirements for laboratory personnel, sample conditioning, and equipment calibration necessary for accurate and repeatable testing results in road construction and paving applications.
Key Topics
- Evaluation of Aggregate Coating: This standard establishes procedures to assess whether an emulsified asphalt can effectively coat aggregate material, emphasizing stability and coating completeness.
- Sample Conditioning: Proper stirring and temperature adjustment of emulsified asphalt samples are required to ensure homogeneity before conducting mixing tests.
- Reference Stone and Ratios: Specifies the use of a consistent source of reference stone, prepared and sieved to particular size requirements, with typical mix ratios (e.g., 93% aggregate to 7% emulsified asphalt).
- Test Apparatus: Outlines essential equipment, such as test sieves, mixing containers, spatulas, and balances for precise measurement.
- Quality Assurance: Notes the importance of personnel competence and equipment calibration, referencing ASTM D3666 for agencies involved in testing and inspection.
Applications
ASTM D6998-19 is widely used in the construction and maintenance of roads and highways where emulsified asphalts are mixed with aggregate materials. Its practical applications include:
- Laboratory Testing: Enables quality control laboratories to assess the performance and suitability of emulsified asphalts prior to field application.
- Material Selection: Helps engineers and specifiers choose appropriate mixing grade emulsified asphalts that ensure robust and consistent aggregate coating.
- Process Control: Assists paving contractors and agencies in verifying that the mixing process results in thorough and uniform asphalt coating, contributing to pavement durability and longevity.
- Inspection and Compliance: Supports regulatory and quality assurance personnel in confirming that materials and procedures meet established industry standards for road and paving projects.
Compliance with ASTM D6998-19 is essential for ensuring stable and homogeneous mixtures, leading to better cohesion between asphalt and aggregate, reduced stripping, and improved pavement performance over time.
Related Standards
Professionals applying ASTM D6998-19 may also need to reference the following standards for complete compliance and best results:
- ASTM D3666 - Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
- Establishes baseline competence and quality control requirements for testing agencies.
- ASTM E11 - Specification for Woven Wire Test Sieve Cloth and Test Sieves
- Details requirements for sieving equipment used in sample preparation and analysis.
- Other relevant ASTM standards involving emulsified asphalt testing methods and aggregate compatibility.
By following ASTM D6998-19 and related standards, users contribute to reliable road infrastructure by ensuring that emulsified asphalt products used in aggregate mixing applications deliver consistent, high-quality results.
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Frequently Asked Questions
ASTM D6998-19 is a standard published by ASTM International. Its full title is "Standard Practice for Evaluating Aggregate Coating using Emulsified Asphalts". This standard covers: 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. Note 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors. 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 This standard 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
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. Note 2: The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar acceptable guideline provides a means of evaluating and controlling some of those factors. 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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes (excluding those in tables and figures) shall not be considered as requirements of the standard. 1.4 This standard 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
ASTM D6998-19 is classified under the following ICS (International Classification for Standards) categories: 93.080.20 - Road construction materials. The ICS classification helps identify the subject area and facilitates finding related standards.
ASTM D6998-19 has the following relationships with other standards: It is inter standard links to ASTM D6998-11, ASTM D3666-16, ASTM D3666-13, ASTM E11-13, ASTM D3666-11, ASTM D3666-09a, ASTM E11-09e1, ASTM D3666-07ae1, ASTM D3666-07a, ASTM D3666-07, ASTM D3666-07e1, ASTM D3666-07e2, ASTM D3666-06, ASTM D3666-05a, ASTM D3666-05. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
ASTM D6998-19 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D6998 −19
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 3.2 All emulsified asphalts with viscosity testing require-
ments of 50 °C shall be conditioned to 50 6 3 °C in a sample
1.1 This practice covers those emulsified asphalts intended
container in a water bath or oven. The container should be
for use by mixing with aggregate. It is not applicable to
vented to relieve pressure.After the sample reaches 50 6 3 °C,
rapid-setting types or diluted materials used for tack coats,
stir the sample to achieve homogeneity.
priming, or mulch treatments.
3.3 Emulsified asphalts with viscosity testing requirements
1.2 The values stated in SI units are to be regarded as
of 25 °C shall be conditioned to 25 6 3 °C in a sample
standard. No other units of measurement are included in this
container to achieve homogeneity.After the sample reaches 25
standard.
6 3 °C, stir the sample to achieve homogeneity.
1.3 The text of this standard references notes and footnotes
NOTE 1—Emulsified asphalts with viscosity testing requirements of
which provide explanatory material. These notes and footnotes
25 °C may be heated and stirred as specified in 3.2, if necessary. In the
(excluding those in tables and figures) shall not be considered
event the 3.2 method is used, the sample should be cooled to 25 6 3 °C.
as requirements of the standard.
1.4 This standard does not purport to address all of the 4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 The intent of this practice is to ensure that a given
responsibility of the user of this standard to establish appro-
mixing grade emulsified asphalt is stable enough and otherwise
priate safety, health, and environmental practices and deter-
possesses the ability to mix with a reference stone for the
mine the applicability of regulatory limitations prior to use.
prescribed time, and coat it uniformly and thoroughly.
1.5 This international standard was developed in accor-
NOTE 2—The quality of the results produced by this standard are
dance with internationally recognized principles on standard-
dependent on the competence of the personnel performing the procedure
ization established in the Decision on Principles for the
and the capability, calibration, and maintenance of the equipment used.
Development of International Standards, Guides and Recom-
Agencies that meet the criteria of Specification D3666 are generally
mendations issued by the World Trade Organization Technical
considered capable of competent and objective testing, sampling,
Barriers to Trade (TBT) Committee. inspection, etc. Users of this standard are cautioned that compliance with
Specification D3666 alone does not completely ensure reliable results.
2. Referenced Documents Reliable results depend on many factors; following the suggestions of
Specification D3666 or some similar acceptable guideline provides a
2.1 ASTM Standards:
means of evaluating and controlling some of those factors.
D3666 Specification for Minimum Requirements for Agen-
cies Testing and Inspecting Road and Paving Materials
5. Apparatus and Material
E11 Specification for Woven Wire Test Sieve Cloth and Test
5.1 Sieves—Standard 19.0-mm and 6.3-mm sieves conform-
Sieves
ing to Specification E11
...
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 − 11 D6998 − 19
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
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 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 The text of this standard references notes and footnotes which provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of the standard.
1.4 This practicestandard 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 safety, health, and healthenvironmental practices and
determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization
established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued
by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
2. Referenced Documents
2.1 ASTM Standards:
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
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°C50 °C shall be conditioned to 50 6 3°C3 °C in 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,3 °C,
stir the sample to achieve homogeneity.
3.3 Emulsified asphalts with viscosity testing requirements of 25°C25 °C shall be conditioned to 25 6 3°C3 °C in a sample
container to achieve homogeneity. After the sample reaches 25 6 3°C,3 °C, stir the sample to achieve homogeneity.
NOTE 1—Emulsified asphalts with viscosity testing requirements of 25°C25 °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. 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.
NOTE 2—The quality of the results produced by this standard are dependent on the competence of the personnel performing the procedure and the
capability, calibration, and maintenance of the equipment used. Agencies that meet the criteria of Specification D3666 are generally considered capable
of competent and objective testing, sampling, inspection, etc. Users of this standard are cautioned that compliance with Specification D3666 alone does
not completely ensure reliable results. Reliable results depend on many factors; following the suggestions of Specification D3666 or some similar
acceptable guideline provides a means of evaluating and controlling some of those fact
...
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