Standard Test Method for Linear Coefficient of Thermal Expansion of Rock Using Bonded Electric Resistance Strain Gauges (Withdrawn 2023)

SIGNIFICANCE AND USE
5.1 Information concerning the thermal expansion characteristics of rocks is important in the design of underground excavation where the temperature of the surrounding rock may be altered. Depending on the restraint conditions, thermal strain may cause thermal stress that may affect the stability of underground excavations. Examples of applications where an understanding of rock thermal strain is important include: nuclear waste repositories, underground power stations, compressed air energy storage facilities, energy foundations, and geothermal energy facilities.  
5.2 The coefficient of linear thermal expansion, α, of rock is known to vary as the temperature changes. Rock thermal strain is normally not a linear function of temperature. This test method provides a procedure for continuously monitoring thermal strain as a function of temperature. Therefore, information on how the coefficient of linear thermal expansion changes with temperature is obtained.  
5.3 Other methods of measuring the coefficient of linear thermal expansion of rock by averaging the thermal strain of a large specimen over a temperature range of many degrees may result in failure to determine the variation in α of that rock for one or more of the following reasons:  
5.3.1 α is not always linear with temperature,  
5.3.2 Some rocks are anisotropic having directional characteristics which can vary by more than a factor of two. If anisotropy is expected, specimen with different orientations should be prepared and tested.  
5.3.3 α may have a negative value in one direction and, at the same time, a positive value in the others.  
5.4 Both wire and foil type strain gauges have been successfully employed to measure the thermal expansion coefficients of rock. These coefficients are frequently very small, being on the order of millionths of a millimetre per millimetre for each degree Celsius. The thermal strain of rocks is about one-tenth that of plastics and one-half or one-quarter that of man...
SCOPE
1.1 This test method covers the laboratory determination of the linear (one-dimensional) coefficient of thermal expansion of rock using bonded electric resistance strain gauges. This test method is intended for evaluation of intact rock cores. Discontinuities in the rock mass, such as joints, inclusions, voids, veins, bedding, and the like can influence the thermal expansion of the rock, and judgment should be used when selecting the specimen to be analyzed in this test method.  
1.2 This test method is applicable for unconfined stress states over the temperature range from 20 to 260°C.
Note 1: Unconfined tests performed at elevated temperatures may alter the mineralogy or grain structure of the test specimen. This alteration may change the physical and thermal properties of the test specimen.
Note 2: The strain gauges are mounted with epoxy. Most commercially available high temperature epoxies require elevated temperature curing. The elevated temperature required for this curing may alter the physical and thermal properties of the test specimen. Epoxy should be selected based upon the maximum expected test temperature. Room temperature curing epoxy should be used whenever practical.  
1.3 The test specimens may be either saturated, dry or unsaturated. If saturated or unsaturated specimens are used, then the test temperature shall be at least 10°C less than the boiling point of the saturating fluid in order to reduce the effects of evaporation of the fluid.
Note 3: When testing a saturated specimen, the gravimetric water content of the specimen may change unless special precautions are taken to encapsulate the test specimen. Refer to 7.4.  
1.4 Units—The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.  
1.5 All observed and calculated values shall conform to the guidelines for significant digits and rounding established in Practice D6026...

General Information

Status
Withdrawn
Publication Date
31-May-2014
Withdrawal Date
08-Jan-2023
Technical Committee
Drafting Committee
Current Stage
Ref Project

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ASTM D5335-14 - Standard Test Method for Linear Coefficient of Thermal Expansion of Rock Using Bonded Electric Resistance Strain Gauges (Withdrawn 2023)
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Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D5335 − 14
Standard Test Method for
Linear Coefficient of Thermal Expansion of Rock Using
1
Bonded Electric Resistance Strain Gauges
This standard is issued under the fixed designation D5335; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope* significant digits that generally should be retained. The proce-
dures used do not consider material variation, purpose for
1.1 This test method covers the laboratory determination of
obtaining the data, special purpose studies, or any consider-
the linear (one-dimensional) coefficient of thermal expansion
ations for the user’s objectives; and it is common practice to
ofrockusingbondedelectricresistancestraingauges.Thistest
increase or reduce significant digits of reported data to be
method is intended for evaluation of intact rock cores. Discon-
commensuratewiththeseconsiderations.Itisbeyondthescope
tinuities in the rock mass, such as joints, inclusions, voids,
of this standard to consider significant digits used in analytical
veins, bedding, and the like can influence the thermal expan-
methods for engineering design.
sion of the rock, and judgment should be used when selecting
the specimen to be analyzed in this test method.
1.6 This standard does not purport to address all of the
safety concerns, if any, associated with its use. It is the
1.2 This test method is applicable for unconfined stress
responsibility of the user of this standard to establish appro-
states over the temperature range from 20 to 260°C.
priate safety and health practices and determine the applica-
NOTE 1—Unconfined tests performed at elevated temperatures may
alterthemineralogyorgrainstructureofthetestspecimen.Thisalteration
bility of regulatory requirements prior to use.
may change the physical and thermal properties of the test specimen.
NOTE 2—The strain gauges are mounted with epoxy. Most commer-
2. Referenced Documents
cially available high temperature epoxies require elevated temperature
curing. The elevated temperature required for this curing may alter the 2
2.1 ASTM Standards:
physical and thermal properties of the test specimen. Epoxy should be
D653Terminology Relating to Soil, Rock, and Contained
selected based upon the maximum expected test temperature. Room
Fluids
temperature curing epoxy should be used whenever practical.
D2113Practice for Rock Core Drilling and Sampling of
1.3 The test specimens may be either saturated, dry or
Rock for Site Investigation
unsaturated. If saturated or unsaturated specimens are used,
D2216Test Methods for Laboratory Determination ofWater
then the test temperature shall be at least 10°C less than the
(Moisture) Content of Soil and Rock by Mass
boiling point of the saturating fluid in order to reduce the
D3740Practice for Minimum Requirements for Agencies
effects of evaporation of the fluid.
Engaged in Testing and/or Inspection of Soil and Rock as
NOTE 3—When testing a saturated specimen, the gravimetric water
content of the specimen may change unless special precautions are taken Used in Engineering Design and Construction
to encapsulate the test specimen. Refer to 7.4.
D6026Practice for Using Significant Digits in Geotechnical
Data
1.4 Units—The values stated in SI units are to be regarded
E83Practice for Verification and Classification of Exten-
as the standard. No other units of measurement are included in
someter Systems
this standard.
E122PracticeforCalculatingSampleSizetoEstimate,With
1.5 All observed and calculated values shall conform to the
Specified Precision, the Average for a Characteristic of a
guidelines for significant digits and rounding established in
Lot or Process
Practice D6026.
E228Test Method for Linear Thermal Expansion of Solid
1.5.1 The procedure used to specify how data are collected/
Materials With a Push-Rod Dilatometer
recorded or calculated in this standard are regarded as the
E289Test Method for Linear Thermal Expansion of Rigid
industry standard. In addition, they are representative of the
Solids with Interferometry
1
ThistestmethodisunderthejurisdictionofASTMCommitteeD18onSoiland
2
Rock and is the direct responsibility of Subcommittee D18.12 on Rock Mechanics. For referenced ASTM standards, visit the ASTM website, www.astm.org, or
CurrenteditionapprovedJune1,2014.PublishedJuly2014.Originallyapproved contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
in 1992. Last previous edition approved in 2008 as D5335–08. DOI: 10.1520/ Standards volume information, refer to the standard’s Document Summary page on
D5335-14. the ASTM website.
*A Summary of Changes section appears at the end of t
...

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