ASTM C308-18(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: C308 − 18 (Reapproved 2023)
Standard Practice for
Working, Initial Setting, and Service Strength Setting Times
of Chemical-Resistant Resin Mortars
This standard is issued under the fixed designation C308; 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 4. Significance and Use
1.1 These methods are used to estimate the working, initial 4.1 These methods offer a means of estimating the working
setting, and service strength setting times of chemical-resistant time, initial setting time and service strength setting time of
resin mortars. chemical-resistant resin mortars. The results obtained should
serve as a guide in, but not as the sole basis for, selection of a
1.2 The values stated in SI units are to be regarded as
chemical-resistant mortar for a particular application.
standard. The values given in parentheses are mathematical
conversions to inch-pound units that are provided for informa-
5. Apparatus
tion only and are not considered standard.
5.1 Weighing Equipment—Shall be capable of weighing
1.3 This standard does not purport to address all of the
materials or specimens to 60.3 % accuracy.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro- 5.2 Mixing Equipment:
priate safety, health, and environmental practices and deter- 5.2.1 Porcelain Enameled Pan—Measuring approximately
mine the applicability of regulatory limitations prior to use. 250 mm long by 400 mm wide by 50 mm deep (10 in. by 16
1.4 This international standard was developed in accor- in. by 2 in.).
dance with internationally recognized principles on standard- 5.2.2 Bricklayer’s Triangular Trowel—Approximately
ization established in the Decision on Principles for the 100 mm (4 in.) in length.
Development of International Standards, Guides and Recom-
5.3 Bricks—As per Specification C279, Type III.
mendations issued by the World Trade Organization Technical
5.4 Vicat Apparatus—The Vicat apparatus shall consist of a
Barriers to Trade (TBT) Committee.
frame, A (see Fig. 1), bearing a movable rod, B, weighing
300 g, one end, C, the plunger end, being 10 mm in diameter
2. Referenced Documents
for a distance of at least 50 mm and the other end having a
2.1 ASTM Standards:
removable steel needle, D, for initial setting time
C279 Specification for Chemical-Resistant Masonry Units
determination, 1 mm in diameter and 50 mm in length. The rod,
C307 Test Method for Tensile Strength of Chemical-
B, is reversible, and can be held in any desired position by a set
Resistant Mortar, Grouts, and Monolithic Surfacings
screw, E, and has an adjustable indicator, F, which moves over
C904 Terminology Relating to Chemical-Resistant Nonme-
a scale (graduated in millimetres) attached to the frame, A. In
tallic Materials
addition to the above, the Vicat apparatus shall conform to the
following requirements:
3. Terminology
5.4.1 Weight of Plunger—300 g 6 0.5 g.
3.1 Definitions—For definitions of terms used in these test
5.4.2 Diameter of Larger End of Plunger—10 mm 6
methods, see Terminology C904. 0.05 mm.
5.4.3 Diameter of Needle—1 mm 6 0.05 mm.
5.4.4 Graduated Scale—The graduated scale, when com-
1 pared with a standard scale accurate to within 0.1 mm at all
This practice is under the jurisdiction of Committee D01 on Paint and Related
Coatings, Materials, and Applications and is the direct responsibility of D01.46 on points, shall not show a deviation at any point greater than
Industrial Protective Coatings.
0.25 mm.
Current edition approved June 1, 2023. Published June 2023. Originally
approved in 1953. Last previous edition approved in 2018 as C308 – 18. DOI:
6. Procedure
10.1520/C0308-18R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
6.1 Temperature:
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
6.1.1 All materials used in this method shall be stored for at
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. least 16 h prior to use at the standard test temperature of 23 °C
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C308 − 18 (2023)
NOTE 1—Ring, G, and plate, H, are not required for this test.
FIG. 1 Vicat Apparatus
6 2 °C (73 °F 6 4 °F). The standard temperature for the the side of the pan. The material used for tests shall not be
working and initial setting time tests shall be 23 °C 6 2 °C returned to the mixing pan. The working time shall be recorded
(73 °F 6 4 °F). Other test temp
...