ASTM C1005-20

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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: C1005 − 19 C1005 − 20
Standard Specification for
Reference Masses and Devices for Determining Mass and
Volume for Use in the Physical Testing of Hydraulic
Cements
This standard is issued under the fixed designation C1005; 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 specification covers the minimum requirements for scales, balances, reference masses, and glass graduates used in the
physical testing of hydraulic cements.
1.2 Requirements for analytical reference masses and balances are not included in this specification, but are to be found in Test
Methods C114. The use of restrictive terminology, classes, ranges, and so forth has been intentionally avoided to allow the use of
this specification by other standards-writing bodies with similar requirements for reference masses and devices for determining
mass, if desired.
1.3 These requirements are not sufficiently descriptive to be used as the sole specifications for the purchase of reference masses
or devices for determining mass without amplification.
1.4 Values in SI units shall be obtained by measurement in SI units or by appropriate conversion, using the Rules for Conversion
and Rounding given in IEEE/ASTM SI–10, of measurement made in other units.
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:
C114 Test Methods for Chemical Analysis of Hydraulic Cement
E29 Practice for Using Significant Digits in Test Data to Determine Conformance with Specifications
E617 Specification for Laboratory Weights and Precision Mass Standards
IEEE/ASTM SI–10 Standard for Use of the International System of Units (SI): The Modern Metric System
3. Terminology
3.1 Definitions:
This specification is under the jurisdiction of ASTM Committee C01 on Cement and is the direct responsibility of Subcommittee C01.95 on Coordination of Standards.
Current edition approved April 1, 2019Nov. 15, 2020. Published April 2019December 2020. Originally approved in 1983. Last previous edition approved in 20182019
as C1005 – 18.C1005 – 19. DOI: 10.1520/C1005-19.10.1520/C1005-20.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or contact ASTM 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.
*A Summary of Changes section appears at the end of this standard
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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3.1.1 accuracy, n—degree of conformity of the indication of a device for determining mass to the true value of an applied mass.
3.1.2 balance, n—a device for determining mass that compares a mass with standard masses.
3.1.3 precision, n—reproducibility of the readings of a device for determining mass when a given test mass is applied.
3.1.4 range of mass determination, n—the range of indications of a device from the minimum test load plus any aids or containers
on the load-receiving elements to the maximum test load with the same aids or containers, as specified by the particular method
of test being used.
3.1.5 readability, n—(analog display) the smallest fraction of a the smallest division to which the index scale of a device for
determining mass can be read with ease either by estimation or by use of a vernier.
3.1.5.1 Discussion—
If the distance between adjacent smallest division marks is less than 1.6 mm, the readability is ⁄2 of a division. If the distance
between adjacent smallest division marks is more that 1.6 mm the readability is ⁄3 of a division.
3.1.6 readability, n—(digital display) the least significant digit indicated by the digital display.
3.1.7 reference mass, n—a piece of material of known specified mass for use in comparing or measuring the mass of other masses
(see Note 1).
3.1.7.1 Discussion—
The definition of “reference mass” was formerly incorrectly designated “weight;” weight is a force (see IEEE/ASTM SI–10).
3.1.8 scale, n—a device for determining mass having a load-receiving element and an index scale (possibly in combination with
the use of internal masses or proportional masses), almost always calibrated to indicate mass; generally of lesser accuracy than a
balance.
3.1.9 sensitivity, n—the minimum change of applied mass required to perceptibly move the indicating element of a device for
determining mass.
3.1.10 sensitivity requirement, n—the minimum change in position of rest of the indicating element of a device for determining
mass in response to a specified change of mass load on the load-receiving element.
3.1.11 test load, n—the mass to be determined in a single determination, exclusive of aids or containers, as specified in the test
method being followed.
3.1.12 tolerance, n—precision and accuracy criteria for reference masses or devices for determining mass.
acceptance tolerance—the maximum permissible deviation from correct indication for new or newly reconditioned or adjusted
reference masses or devices for determining mass; equal to ⁄2 the maintenance tolerance.
adjustment tolerance—acceptance tolerance.
maintenance tolerance—maximum permissible deviation from correct indication for reference masses and devices for
determining mass in service.
3.1.13 total load, n—the sum of the masses of materials and aids or containers applied to the load-receiving element at any one
time.
4. Reference Masses
4.1 Reference masses for use in the methods of physical testing of hydraulic cement and related and similar materials shall
conform at least to the requirements of Class 6 reference masses in Specification E617, except that the maintenance tolerances
given in Specification E617 for Class 6 reference masses are to be considered acceptance tolerances for purposes of this
specification and the maintenance tolerances twice these values. See Table 1. (See Note 1.)
NOTE 1—Former NBS Class P and F reference masses meet this specification as do OIML Class M1 reference masses. Former NBS Class T reference
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masses of 100 mg and less, Class C reference masses of 1 kg and greater, and OIML Class M2 reference masses of 200 g and greater meet the
specification.
NOTE 1—Former NBS Class P and F reference masses meet this specification as do OIML Class M1 reference masses. Former NBS Class T reference
masses of 100 mg and less, Class C reference masses of 1 kg and greater, and OIML Class M2 reference masses of 200 g and greater meet the
specification.
4.2 A mass used strictly as a mass, whose actual value need not be known, need not meet the requirements of 4.1 (see Note 2).
NOTE 2—A tare mass for a container used in mass determination is in this category. The actual value of its mass need not be known, but it must be equal
in mass to that of the container.
5. Requirements for Scales and Balances
A,B
TABLE 1 Tolerances for Reference Masses
Acceptance Maintenance
Mass, g Tolerance, Tolerance,
±mg ±mg
10 000 1 000 2 000
5 000 500 1 000
3 000 300 600
2 000 200 400
1 000 100 200
500 50 100
300 30 60
200 20 40
100 10 20
50 7 14
30 5 10
20 3 6
10 2 4
5 2 4
3 2 4
2 2 4
1 2 4
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A
Values from Table 1 of Specification E617 for Class 6 metric reference masses.
B
For reference masses with unlisted nominal values, the tolerance shall be that for
the next lower denomination listed.
5.1 Capacity—The c
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