ASTM C166-05(2023)

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: C166 − 05 (Reapproved 2023)
Standard Test Method for
Covering Capacity and Volume Change Upon Drying of
Thermal Insulating Cement
This standard is issued under the fixed designation C166; 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 of dry cement) after the wet cement has been molded and dried
to constant weight in accordance with Section 6.
1.1 Wet covering capacity and volume change upon drying
are often of major importance in the application of thermal
3.2 volume change upon drying—the percentage change in
insulating cement. These properties can be easily determined at
volume of the wet molded cement that occurs when the dry
the same time that the determinations of dry covering capacity
cement is mixed with the recommended amount of water,
are made. Therefore, the procedures for determining these
molded, and dried to constant weight in accordance with
three properties are covered together in this test method.
Section 6.
1.2 The values stated in inch-pound units are to be regarded
3.3 wet covering capacity—the area covered in “ft , 1 in. in
as standard. The values given in parentheses are mathematical
thickness/100 lb of dry cement” (m , 1 cm in thickness/100 kg
conversions to SI units that are provided for information only
of dry cement) when the cement is mixed with the recom-
and are not considered standard.
mended amount of water and molded in accordance with
1.3 This standard does not purport to address all of the Section 6.
safety concerns, if any, associated with its use. It is the
3.4 Definitions in Terminology C168 shall be considered as
responsibility of the user of this standard to establish appro-
applying to the terms used in this test method.
priate safety, health, and environmental practices and deter-
mine the applicability of regulatory limitations prior to use.
4. Significance and Use
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard- 4.1 This test method is used to determine the wet covering
ization established in the Decision on Principles for the and volume change upon drying of thermal insulating cement.
Development of International Standards, Guides and Recom-
mendations issued by the World Trade Organization Technical
5. Apparatus
Barriers to Trade (TBT) Committee.
5.1 Mold—A rigid mold having inside dimensions of 1 by 8
by 30 in. (25.4 by 203 by 726 mm) with one end and one face
2. Referenced Documents
open, and a piece of wood or other suitable material 1 by 1 ⁄2
2.1 ASTM Standards:
by 7 ⁄8 in. (25.4 by 38.1 by 200 mm) in dimensions for squaring
C163 Practice for Mixing Thermal Insulating Cement
up the end of the test specimen toward the open end of the
Samples
mold.
C168 Terminology Relating to Thermal Insulation
5.2 Wax Paper—Sheets of wax paper 8 by 30 in. (200 by
3. Terminology
762 mm) in dimensions.
3.1 dry covering capacity—the area covered in “ft , 1 in. in
5.3 Engine Oil.
thickness/100 lb of dry cement” (m , 1 cm in thickness/100 kg
5.4 Trowel—A 16-in. (about 400-mm) rectangular plaster-
er’s trowel.
This test method is under the jurisdiction of ASTM Committee C16 on Thermal
5.5 Steel Rules—Steel rules 18 and 36 in. (about ⁄2 and 1 m)
Insulation and is the direct responsibility of Subcommittee C16.31 on Chemical and
Physical Properties. in length accurate to within ⁄64 in. (0.5 mm).
Current edition approved March 15, 2023. Published April 2023. Originally
5.6 Depth Gage—A depth gage consisting of a rigid,
approved in 1941. Last previous edition approved in 2016 as C166 – 05 (2016).
DOI: 10.1520/C0166-05R23.
pointed rod approximately ⁄8 in. (3 mm) in diameter, fitted
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
with a flat disk about ⁄2 in. (13 mm) in diameter which is
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
moved along the rod either by a sliding action or by means of
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. threads.
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C166 − 05 (2023)
6. Sampling and Mixing 7.6 Immediately after the measurements have been made, or
as soon thereafter as recommended by the manufacturer, place
6.1 The cement shall be sampled and mixed in accordance
the cement specimen and mold in an oven at 215 to 250°F (102
with Practice C163.
to 121°C) until dried to constant weight. The oven chamber
shall be adequately vented in such a manner as to ensure
7. Procedure
complete circulation of the atmosphere of the entire oven
7.1 Oil the inside surfaces of the mold well, or line them
chamber, preferably by fan or other forced circulation method.
with wax paper in order to prevent the cement from sticking to
7.7 After the dried specimen has been weighed, measure it
the sides and to permit convenient removal of the specimen.
for thickness, width, and length at the same locations at which
Then place the mixed cement in the mold.
corresponding measurements were made before the specimen
7.2 Trowel the cement in one layer and in two directions
was dried. These locations are indicated by the indentation
lengthwise of the mold without unnecessary compacting, until
marks made in the wet cement. Measure the thickness as
the surface is smooth and flush with the top edges of the mold.
described in 7.4. In order to prevent false thickness measure-
Sufficient wet cement shall be used to fill the mold when the
ments on the dry specimen, due to the bottom surface of the
piece of wood or other suitable material is in place in the open
specimen having become warped in drying, remove the speci-
end of the mold and in contact with the c
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