ASTM D7115-20

Standard Test Method for Measurement of Superpave Gyratory Compactor (SGC) Internal Angle of Gyration Using Simulated Loading

SIGNIFICANCE AND USE
5.1 SGCs are used to produce asphalt mixture specimens in the laboratory to assess volumetric properties and predict pavement performance. In the fabrication of an SGC specimen in accordance with Test Method D6925, loose asphalt mixture is placed inside a metal mold, which is then placed into an SGC. A constant consolidation pressure is applied to the sample while the mold gyrates at a nominally constant angle (referred to as the internal angle of gyration) and rate. Consistency in the density of the asphalt specimens produced as measured by Test Method D2726/D2726M or D6752/D6752M is very important to the validity of the tests performed. Specimens of a consistent density are produced when an SGC maintains a constant pressure and a known constant internal angle of gyration during the compaction process.  
5.2 There are several manufacturers and models of SGC. Each model employs a unique method of setting, inducing, and maintaining the internal angle of gyration. Each model also employs a unique calibration system to measure the external angle of gyration. These existing calibration systems cannot be used universally on all of the different SGC models commercially available. Inconsistencies in asphalt specimens produced on different SGC models have been at least partially attributed to variations in the angle of gyration.  
5.3 This method describes instruments and processes that can be used to independently measure the internal angle of gyration of any manufacturer’s SGC model under simulated loading conditions. The external shape of the instrument chassis ensures that the points of physical contact between the mold end plates and the instrument occur at a fixed and known distance away from the axis of gyration. As a result, the vertical load is applied at these fixed points, creating tilting moments at each end of the mold.  
5.4 Unless otherwise specified, a tilting moment of 466.5 N-m shall be applied to the SGC by the instrument while making this measurement....
SCOPE
1.1 This test method covers the procedure for the measurement of the Superpave Gyratory Compactor (SGC) internal angle of gyration using an instrument capable of simulating loading conditions similar to those created by an asphalt mixture specimen.  
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. The value given in rotations per minute is provided for information regarding commonly used units.  
1.2.1 IEEE/ASTM SI 10, American National Standard for Metric Practice, offers guidance where use of decimal degrees for plane angles (versus radians) and revolutions per minute for rate of gyration (versus radians per second) is acceptable within the IEEE/ASTM SI 10 system when used on a minimal basis.  
1.3 The text of this test method 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-Apr-2020
• ICS: 93.080.20 - Road construction materials
• Technical Committee: D04 - Road and Paving Materials
• Drafting Committee: D04.20 - Mechanical Tests of Asphalt Mixtures

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: D7115 − 20
Standard Test Method for
Measurement of Superpave Gyratory Compactor (SGC)
1
Internal Angle of Gyration Using Simulated Loading
This standard is issued under the fixed designation D7115; 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 2. Referenced Documents
2
1.1 This test method covers the procedure for the measure- 2.1 ASTM Standards:
ment of the Superpave Gyratory Compactor (SGC) internal C670 Practice for Preparing Precision and Bias Statements
angle of gyration using an instrument capable of simulating for Test Methods for Construction Materials
loading conditions similar to those created by an asphalt D8 Terminology Relating to Materials for Roads and Pave-
mixture specimen. ments
D2726/D2726M Test Method for Bulk Specific Gravity and
1.2 Units—The values stated in SI units are to be regarded
Density of Non-Absorptive Compacted Asphalt Mixtures
as standard. No other units of measurement are included in this
D3666 Specification for Minimum Requirements for Agen-
standard. The value given in rotations per minute is provided
cies Testing and Inspecting Road and Paving Materials
for information regarding commonly used units.
D6752/D6752M Test Method for Bulk Specific Gravity and
1.2.1 IEEE/ASTM SI 10, American National Standard for
Density of CompactedAsphalt Mixtures UsingAutomatic
Metric Practice, offers guidance where use of decimal degrees
Vacuum Sealing Method
forplaneangles(versusradians)andrevolutionsperminutefor
D6925 Test Method for Preparation and Determination of
rate of gyration (versus radians per second) is acceptable
the Relative Density ofAsphalt Mix Specimens by Means
within the IEEE/ASTM SI 10 system when used on a minimal
of the Superpave Gyratory Compactor
basis.
E691 Practice for Conducting an Interlaboratory Study to
1.3 The text of this test method references notes and
Determine the Precision of a Test Method
footnotes which provide explanatory material. These notes and
IEEE/ASTM SI 10 American National Standard for Metric
footnotes (excluding those in tables and figures) shall not be
Practice
considered as requirements of the standard
1.4 This standard does not purport to address all of the 3. Terminology
safety concerns, if any, associated with its use. It is the
3.1 Definitions—For definitions of terms used in this test
responsibility of the user of this standard to establish appro-
method, refer to Terminology D8.
priate safety, health, and environmental practices and deter-
3.2 Definitions of Terms Specific to This Standard:
mine the applicability of regulatory limitations prior to use.
3.2.1 bottom internal angle, n—the angle formed between
1.5 This international standard was developed in accor-
the internal mold diameter and the lower mold end plate as a
dance with internationally recognized principles on standard-
mold is gyrated in an SGC.
ization established in the Decision on Principles for the
3.2.2 eccentricity, e, n—the distance away from the axis of
Development of International Standards, Guides and Recom-
gyration at which a force (F) is acting at one end of an SGC
mendations issued by the World Trade Organization Technical
mold.
Barriers to Trade (TBT) Committee.
3.2.2.1 Discussion—This use of the term eccentricity is
1
This test method is under the jurisdiction of ASTM Committee D04 on Road
and Paving Materials and is the direct responsibility of Subcommittee D04.20 on
2
Mechanical Tests of Asphalt Mixtures. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
Current edition approved May 1, 2020. Published May 2020. Originally contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
approved in 2005. Last previous edition approved in 2015 as D7115 – 10 (2015). Standards volume information, refer to the standard’s Document Summary page on
DOI: 10.1520/D7115-20. the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7115 − 20
consistent with previous published reports describing the an SGC maintains a constant pressure and a known constant
3
mechanics of gyratory compaction. internal angle of gyration during the compaction process.
3.2.3 effective internal angle, n—the average of the top
5.2 There are several manufacturers and models of SGC.
internal angle and the bottom internal angle.
Each model employ
...

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: D7115 − 10 (Reapproved 2015) D7115 − 20
Standard Test Method for
Measurement of Superpave Gyratory Compactor (SGC)
1
Internal Angle of Gyration Using Simulated Loading
This standard is issued under the fixed designation D7115; 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 test method covers the procedure for the measurement of the Superpave Gyratory Compactor (SGC) internal angle of
gyration using an instrument capable of simulating loading conditions similar to those created by a hot mix asphalt an asphalt
mixture specimen.
1.2 Units—The values stated in SI units are to be regarded as standard. No other units of measurement are included in this
standard. The value given in rotations per minute is provided for information regarding commonly used units.
1.2.1 IEEE/ASTM SI 10, American National Standard for the Use of International System of Units (SI): The Modern Metric
System,Metric Practice, offers guidance where use of decimal degrees for plane angles (versus radians) and revolutions per minute
for rate of gyration (versus radians per second) is acceptable within the IEEE/ASTM SI 10 system when used on a minimal basis.
1.3 The text of this test method 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 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
2.1 ASTM Standards:
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D8 Terminology Relating to Materials for Roads and Pavements
D2726D2726/D2726M Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Asphalt Mixtures
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
D6752D6752/D6752M Test Method for Bulk Specific Gravity and Density of Compacted Asphalt Mixtures Using Automatic
Vacuum Sealing Method
D6925 Test Method for Preparation and Determination of the Relative Density of Asphalt Mix Specimens by Means of the
Superpave Gyratory Compactor
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method
IEEE/ASTM SI 10 American National Standard for the Use of International System of Units (SI): The Modern Metric
SystemMetric Practice
3. Terminology
3.1 Definitions—For definitions of terms used in this test method, refer to Terminology D8.
3.2 Definitions:Definitions of Terms Specific to This Standard:
1
This test method is under the jurisdiction of ASTM Committee D04 on Road and Paving Materials and is the direct responsibility of Subcommittee D04.20 on Mechanical
Tests of Asphalt Mixtures.
Current edition approved Dec. 1, 2015May 1, 2020. Published February 2016May 2020. Originally approved in 2005. Last previous edition approved in 20102015 as
D7115 – 10.D7115 – 10 (2015). DOI: 10.1520/D7115-10R15.10.1520/D7115-20.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM Standards
volume information, refer to the standard’s Document Summary page on the ASTM website.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7115 − 20
3.2.1 bottom internal angle, n—the angle formed between the internal mold diameter and the lower mold end plate as a mold
is gyrated in an SGC.
3.2.2 eccentricity, e, n—the distance away from the axis of gyration at which a force (F) is acting at one end of an SGC mold.
3.2.2.1 Discussion—
3
This use of the t
...