ASTM C1305/C1305M-16(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: C1305/C1305M − 16 (Reapproved 2023)
Standard Test Method for
Crack Bridging Ability of Liquid-Applied Waterproofing
Membrane
This standard is issued under the fixed designation C1305/C1305M; 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 3. Terminology
1.1 This test method covers a laboratory procedure for 3.1 Definitions—Refer to Terminology C717 for definitions
determining the ability of a waterproofing membrane to bridge of technical terms used in this test method.
a crack in the substrate.
4. Summary of Test Method
1.2 There are no ISO standards similar or equivalent to this
ASTM standard. 4.1 This test method consists of casting five specimens of
membrane on mortar substrates containing a preexisting crack
1.3 The values stated in either SI units or inch-pound units
and allowing them to age 14 days at standard conditions
are to be regarded separately as standard. The values stated in
followed by seven days in an air-circulating oven at 70 °C
each system may not be exact equivalents; therefore, each
[158 °F], placing them in a test machine, and subjecting the
system shall be used independently of the other. Combining
assembly to ten cycles of movement.
values from the two systems may result in nonconformance
with the standard.
5. Significance and Use
1.4 This standard does not purport to address all of the
5.1 This test method is used to indicate a waterproofing
safety concerns, if any, associated with its use. It is the
membrane’s ability to maintain its integrity while bridging a
responsibility of the user of this standard to establish appro-
preexisting crack in the substrate at low ambient temperatures,
priate safety, health, and environmental practices and deter-
when the membrane is least likely to be flexible.
mine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accor-
6. Comparison to Other Standards
dance with internationally recognized principles on standard-
6.1 The committee with jurisdiction over this standard is not
ization established in the Decision on Principles for the
aware of any comparable standards published by other orga-
Development of International Standards, Guides and Recom-
nizations.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
7. Apparatus and Materials
2. Referenced Documents
7.1 Automatic Extension and Compression Machine, with
cold box capable of maintaining −26 6 1 °C [−15 6 2 °F].
2.1 ASTM Standards:
C33/C33M Specification for Concrete Aggregates
7.2 Circulating Hot-Air Oven.
C150/C150M Specification for Portland Cement
7.3 Portland Cement, high early strength conforming to
C717 Terminology of Building Seals and Sealants
Specification C150/C150M, Type III.
C1375 Guide for Substrates Used in Testing Building Seals
7.4 Fine Aggregate, conforming to Specification C33/
and Sealants
C33M.
7.5 Aluminum Angles, 75 by 50 by 25 mm [3 by 2 by 1 in.],
This test method is under the jurisdiction of ASTM Committee D08 on Roofing if needed.
and Waterproofing and is the direct responsibility of Subcommittee D08.22 on
7.6 Epoxy Cement, or gun-grade construction mastic, if
Waterproofing and Dampproofing Systems.
Current edition approved Sept. 1, 2023. Published September 2023. Originally needed.
approved in 1995. Last previous edition approved in 2016 as C1305/C1305M – 16.
7.7 Masking Tape.
DOI: 10.1520/C1305_C1305M-16R23.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
7.8 Molds, six, 50 by 25 by 25 mm [2 by 1 by 1 in.] inside
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
dimensions, or 75 by 88 by 25 mm [0.5 by 1.5 by 1 in.] notches
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. in either side, as shown in Fig. 1, for casting mortar blocks.
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C1305/C1305M − 16 (2023)
FIG. 1 Test Assembly Options
8. Preparation of Substrates 9. Conditioning/Mixing
8.1 Prepare mortar blocks in sizes required for testing in
9.1 Store all materials to be tested at standard conditions of
accordance with the r
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