ASTM C566-19

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Designation: C566 − 13 C566 − 19
Standard Test Method for
Total Evaporable Moisture Content of Aggregate by Drying
This standard is issued under the fixed designation C566; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope Scope*
1.1 This test method covers the determination of the percentage of evaporable moisture in a sample of aggregate by drying both
surface moisture and moisture in the pores of the aggregate. Some aggregate may contain water that is chemically combined with
the minerals in the aggregate. Such water is not evaporable and is not included in the percentage determined by this test method.
1.2 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.
NOTE 1—Sieve size is identified by its standard designation in Specification E11. The alternative designation given in parentheses is for information
only and does not represent a different standard sieve size.
1.3 The text of this standard references notes and footnotes that provide explanatory material. These notes and footnotes
(excluding those in tables and figures) shall not be considered as requirements of this 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. For specific precautionary statements, see 5.3.1, 7.2.1, and 7.3.1.
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:
C29/C29M Test Method for Bulk Density (“Unit Weight”) and Voids in Aggregate
C125 Terminology Relating to Concrete and Concrete Aggregates
C127 Test Method for Relative Density (Specific Gravity) and Absorption of Coarse Aggregate
C128 Test Method for Relative Density (Specific Gravity) and Absorption of Fine Aggregate
C670 Practice for Preparing Precision and Bias Statements for Test Methods for Construction Materials
D75D75/D75M Practice for Sampling Aggregates
E11 Specification for Woven Wire Test Sieve Cloth and Test Sieves
2.2 Other Document:
National Research Council Report SHRP-P-619
3. Terminology
3.1 Definitions:
3.1.1 For definitions of terms used in this test method, refer to Terminology C125.
4. Significance and Use
4.1 This test method is sufficiently accurate for usual purposes, such as adjusting batch quantities of ingredients for concrete.
It will generally measure the moisture in the test sample more reliably than the sample can be made to represent the aggregate
This test method is under the jurisdiction of ASTM Committee C09 on Concrete and Concrete Aggregatesand is the direct responsibility of Subcommittee C09.20 on
Normal Weight Aggregates.
Current edition approved Feb. 1, 2013June 1, 2019. Published February 2013July 2019. Originally approved in 1965. Last previous edition approved in 20042013 as
C566 – 97 (2004).C566 – 13. DOI: 10.1520/C0566-13.10.1520/C0566-19.
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.
Available from the National Research Council, 2101 Constitution Ave., N.W., Washington, DC 20418.
*A Summary of Changes section appears at the end of this standard
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C566 − 19
supply. In cases where the aggregate itself is altered by heat, or where more refined measurement is required, the test should be
conducted using a ventilated, controlled temperature oven.
4.2 Large particles of coarse aggregate, especially those larger than 50 mm, will require greater time for the moisture to travel
from the interior of the particle to the surface. The user of this test method should determine by trial if rapid drying methods
provide sufficient accuracy for the intended use when drying large size particles.
5. Apparatus
5.1 Balance—A balance or scale accurate, readable, and sensitive to within 0.1 % of the test load at any point within the range
of use. Within any interval equal to 10 % of the capacity of the balance or scale used to determine mass, the load indication shall
be accurate within 0.1 % of the difference in masses.
5.2 Source of Heat—A ventilated oven capable of maintaining the temperature surrounding the sample at 110 6 5°C. Where
close control of the temperature is not required (see 4.1), other suitable sources of heat may be used, such as an electric or gas
hot plate, electric heat lamps, or a ventilated microwave oven.
5.3 Sample Container—A container not affected by the heat, of sufficient volume to contain the sample without danger of
spilling, and of such shape that the depth of sample will not exceed one fifth of the least lateral dimension.
5.3.1 Precaution—When a microwave oven is used, the container shall be nonmetallic.
NOTE 2—Except for testing large samples, an ordinary frying pan is suitable for use with a hot plate, or any shallow flat-bottomed metal pan is suitable
with heat lamps or oven. Note the precaution in 5.3.1.
5.4 Stirrer—A metal spoon or spatula of convenient size.
6. Sampling
6.1 Sample in accordance with Practice D75D75/D75M, except for the sample size.
6.2 Secure a sample of the aggregate representative of the moisture content in the supply being tested and having a mass not
less than the amount listed in Table 1. Protect the sample against loss of moisture prior to determining the mass.
7. Procedure
7.1 Determine the mass of the sample to the nearest 0.1 %.
7.2 Dry the sample thoroughly in the sample container by means of the selected source of heat, exercising care to avoid loss
of any particles. Very
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