ASTM D7115-10
(Test Method)Standard Test Method for Measurement of Superpave Gyratory Compactor (SGC) Internal Angle of Gyration Using Simulated Loading
Standard Test Method for Measurement of Superpave Gyratory Compactor (SGC) Internal Angle of Gyration Using Simulated Loading
SIGNIFICANCE AND USE
SGCs are used to produce hot-mix asphalt (HMA) 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 HMA 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 angle of gyration) and rate. Consistency in the density of the asphalt specimens produced as measured by Test Methods D2726 or D6752 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 angle of gyration during the compaction process.
There are several manufacturers and models of SGC. Each model employs a unique method of setting, inducing, and maintaining the angle of gyration. Each model also employs a unique calibration system to measure the external angle of gyration. These existing calibration systems can not 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.
This method describes instruments and processes that can be used to independently measure the internal angle of gyration of any manufacturers’ SGC model under simulated loading conditions. The external shape of the instrument chassis assures 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.
Unless otherwise specified, a tilting moment of 466.5 N-m shall be applied to the SGC by the instrument while making this measurement.
Note 1—The quality of the results produced by this test meth...
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 specimen.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 , American National Standard for the Use of International System of Units (SI): The Modern Metric System, 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 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 and health practices and determine the applicability of regulatory limitations prior to use.
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Designation: D7115 − 10
StandardTest 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 D3666 Specification for Minimum Requirements for Agen-
cies Testing and Inspecting Road and Paving Materials
1.1 This test method covers the procedure for the measure-
D6752 Test Method for Bulk Specific Gravity and Density
ment of the Superpave Gyratory Compactor (SGC) internal
of Compacted Bituminous Mixtures Using Automatic
angle of gyration using an instrument capable of simulating
Vacuum Sealing Method
loading conditions similar to those created by a hot mix asphalt
D6925 Test Method for Preparation and Determination of
specimen.
the Relative Density of Hot Mix Asphalt (HMA) Speci-
1.2 The values stated in SI units are to be regarded as
mens by Means of the Superpave Gyratory Compactor
standard. No other units of measurement are included in this
E691 Practice for Conducting an Interlaboratory Study to
standard.
Determine the Precision of a Test Method
1.2.1 IEEE/ASTM SI 10, American National Standard for
IEEE/ASTM SI 10 American National Standard for the Use
the Use of International System of Units (SI): The Modern
of International System of Units (SI): The Modern Metric
Metric System, offers guidance where use of decimal degrees
System
forplaneangles(versusradians)andrevolutionsperminutefor
rate of gyration (versus radians per second) is acceptable
3. Terminology
within the IEEE/ASTM SI 10 system when used on a minimal
3.1 Definitions:
basis.
3.1.1 external angle—the angle formed between the exter-
1.3 The text of this test method references notes and
nal mold diameter and a stationary reference axis of the
footnotes which provide explanatory material. These notes and
machine frame.
footnotes (excluding those in tables and figures) shall not be
3.1.2 internal angle—the angle formed between the internal
considered as requirements of the standard
mold diameter and a mold end plate as a mold is gyrated in an
1.4 This standard does not purport to address all of the
SGC.
safety concerns, if any, associated with its use. It is the
3.1.3 top internal angle—the angle formed between the
responsibility of the user of this standard to establish appro-
internal mold diameter and the upper mold end plate as a mold
priate safety and health practices and determine the applica-
is gyrated in an SGC.
bility of regulatory limitations prior to use.
3.1.4 bottom internal angle—the angle formed between the
2. Referenced Documents
internal mold diameter and the lower mold end plate as a mold
2
2.1 ASTM Standards:
is gyrated in an SGC.
C670 Practice for Preparing Precision and Bias Statements
3.1.5 effective internal angle—the average of the top inter-
for Test Methods for Construction Materials
nal angle and the bottom internal angle.
D2726 Test Method for Bulk Specific Gravity and Density
3.1.6 tilting moment—a force (F) acting at one end of an
of Non-Absorptive Compacted Bituminous Mixtures
SGC mold platen in a direction parallel to the axis of gyration,
but acting at some distance (e) away from that axis. The tilting
1
This test method is under the jurisdiction of ASTM Committee D04 on Road
moment at one end of the mold platen is computed as the
and Paving Materials and is the direct responsibility of Subcommittee D04.20 on
product of this distance (e) and force (F).
Mechanical Tests of Bituminous Mixtures.
Current edition approved June 1, 2010. Published June 2010. Originally
3.1.7 total moment—the sum total (M) of the tilting moment
approved in 2005. Last previous edition approved in 2008 as D7115 – 08. DOI:
acting at the top of the mold and the tilting moment acting at
10.1520/D7115-10.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or the bottom of the mold.
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3.1.8 eccentricity—the distance (e) away from the axis of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. gyration at which a force (F) is acting at one end of an SGC
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7115 − 10
mold. This use of the term eccentricity is consistent with load is applied at these fixed points, creating tilting moments at
previous published reports describing the mechanics of gyra- each end of the m
...
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:D7115–08 Designation: D7115 – 10
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 specimen.
1.2
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.2.1 IEEE/ASTM SI 10, American National Standard for the Use of International System of Units (SI): The Modern Metric
System, 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 and health practices and determine the applicability of regulatory
limitations prior to use.
2. Referenced Documents
2
2.1 ASTM Standards:
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D2726 Test Method for Bulk Specific Gravity and Density of Non-Absorptive Compacted Bituminous Mixtures
D3666 Specification for Minimum Requirements for Agencies Testing and Inspecting Road and Paving Materials
D6752 Test Method for Bulk Specific Gravity and Density of Compacted Bituminous Mixtures Using Automatic Vacuum
Sealing Method
D6925 Test Method for Preparation and Determination of the Relative Density of Hot Mix Asphalt (HMA) Specimens by
Means of the Superpave Gyratory Compactor
E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method 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 System
3. Terminology
3.1 Definitions:
3.1.1 external angle—the angle formed between the external mold diameter and a stationary reference axis of the machine
frame.
3.1.2 internal angle—theangleformedbetweentheinternalmolddiameterandamoldendplateasamoldisgyratedinanSGC.
3.1.3 top internal angle—the angle formed between the internal mold diameter and the upper mold end plate as a mold is
gyrated in an SGC.
3.1.4 bottom internal angle—the angle formed between the internal mold diameter and the lower mold end plate as a mold is
gyrated in an SGC.
3.1.5 effective internal angle—the average of the top internal angle and the bottom internal angle.
3.1.6 tilting moment—a force (F) acting at one end of an SGC mold platen in a direction parallel to the axis of gyration, but
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD04onRoadandPavingMaterialsandisthedirectresponsibilityofSubcommitteeD04.20onMechanical
Tests of Bituminous Mixtures.
Current edition approved JulyJune 1, 2008.2010. Published July 2008.June 2010. Originally approved in 2005. Last previous edition approved in 20052008 as
D7115 – 058. DOI: 10.1520/D7115-108.
2
For referencedASTM standards, visit theASTM website, www.astm.org, or contactASTM Customer Service at service@astm.org. 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 – 10
acting at some distance (e) away from that axis. The tilting moment at one end of the mold platen is computed as the product of
this distance (e) and force (F).
3.1.7 total moment—the sum total (M) of the tilting moment acting at the top of the mold and the
...
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