GB/T 13477.17-2017 PDF English
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| GB/T 13477.17-2017 | English | 170 |
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Test method for building sealants -- Part 17: Determination of elastic recovery
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| GB/T 13477.17-2002 | English | 399 |
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GB/T 13477.17-2017: Test method for building sealants -- Part 17: Determination of elastic recovery---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT13477.17-2017
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 91.100.50
Q 24
Replacing GB/T 13477.17-2002
Test method for building sealants - Part 17: Determination
of elastic recovery
(ISO 7389:2002, Building construction - Jointing products - Determination of
elastic recovery of sealants, MOD)
ISSUED ON: MARCH 9, 2017
IMPLEMENTED ON: FEBRUARY 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Principle ... 6
5 Standard test conditions ... 7
6 Test apparatus ... 7
7 Specimen preparation ... 7
8 Specimen processing ... 9
9 Test steps ... 10
10 Calculation of test results ... 11
11 Test report ... 11
Appendix A (Informative) Structural changes in this part compared with ISO 7389:2002
... 13
Appendix B (Informative) Technical differences between this part and ISO 7389:2002
and their reasons ... 14
Foreword
GB/T 13477 Test method for building sealants is divided into 20 parts:
-- Part 1: Specifications for test substrates;
-- Part 2: Determination of density;
-- Part 3: Determination of extrudability of sealants using standardized apparatus;
-- Part 4: Determination of extrudability of one-component sealants;
-- Part 5: Determination for tack-free time;
-- Part 6: Determination of flow;
-- Part 7: Determination of low-temperature flexibility;
-- Part 8: Determination of tensile properties;
-- Part 9: Determination of adhesion/cohesion properties after immersion in water;
-- Part 10: Determination of tensile properties at maintained extension;
-- Part 11: Determination of tensile properties at maintained extension after
immersion in water;
-- Part 12: Determination of adhesion/cohesion properties at constant temperature;
-- Part 13: Determination of adhesion/cohesion properties at variable temperatures;
-- Part 14: Determination of resistance to prolonged exposure to water;
-- Part 15: Determination of adhesion/cohesion properties after exposure to heat
and artificial light through glass and to water;
-- Part 16: Determination of resistance to compression;
-- Part 17: Determination of elastic recovery;
-- Part 18: Determination of adhesion-in-peel;
-- Part 19: Determination of change in mass and volume;
-- Part 20: Determination of staining.
This part is Part 17 of GB/T 13477.
Test method for building sealants - Part 17: Determination
of elastic recovery
1 Scope
This part of GB/T 13477 specifies the method for determining the elastic recovery of
building sealing materials after maintaining a tensile state.
This part is suitable for determining the elastic recovery of building sealing materials.
2 Normative references
The following documents are essential to the application of this document. For the dated
referenced documents, only the versions with the indicated dates are applicable to this
document; for the undated referenced documents, only the latest version (including all
the amendments) is applicable to this document.
GB/T 13477.1 Test method for building sealants - Part 1: Specifications for test
substrates (GB/T 13477.1-2002, ISO 13640:1999, MOD)
GB/T 14682 Building sealing material vocabulary (GB/T 14682-2006, ISO
6927:1981, NEQ)
GB/T 22083-2008 Classification and requirements for building sealants (ISO
11600:2002, MOD)
3 Terms and definitions
The terms and definitions defined in GB/T 14682 apply to this document.
4 Principle
The specimen is stretched to the specified width, maintained in the tensile state for the
specified time, and then released. The elastic recovery (expressed as a percentage of
elongation) is calculated based on the change in width of the specimen before and after
stretching.
5 Standard test conditions
The standard test conditions of the laboratory are as follows: a temperature of (23±2) ℃,
and the relative humidity of (50±5) %.
6 Test apparatus
6.1 Adhesive substrate: Cement mortar boards, glass plates, or aluminum plates that
meet the requirements of GB/T 13477.1 and are used to prepare test specimens. The
shape and sizes of the substrate are shown in Figures 1 and 2. For each specimen, two
substrates of the same material shall be used. Substrates of other materials and sizes can
also be selected as agreed upon by all parties, but the bonding size and area of the
embedded sealing material sample shall be the same as shown in Figures 1 and 2.
6.2 Spacer block: The surface shall be anti-adhesive and used to prepare a sealing
material specimen with a cross-section of 12 mm×12 mm (as shown in Figures 1 and
2).
6.3 Positioning block: It is used to control the width of the stretched specimen, allowing
the specimen to maintain an elongation rate of 25%, 60%, 100% of the initial width, or
the width agreed upon by all parties.
6.4 Bond breaker: Anti-adhesive film or anti-adhesive paper, such as polyethylene (PE)
film, should be selected according to the recommendations of the sealing material
manufacturer. It is used to prepare specimens.
6.5 Blast drying oven: The temperature can be adjusted to (70±2) ℃; it is used to
process the specimen according to method B (see 8.3).
6.6 Tensile testing machine: It is capable of stretching the specimen at a speed of
(5.5±0.7) mm/min.
6.7 Container: It is used to hold distilled water and soak the specimen according to
method B (see 8.3).
6.8 Vernier caliper: The graduation value is 0.1 mm.
7 Specimen preparation
Use degreasing gauze to remove floating dust from the surface of the cement mortar
board. Use acetone and other solvents to clean the aluminum plate and glass plate and
dry them.
8.2 Method A
The prepared specimens are stored under standard test conditions for 28 days.
8.3 Method B
First process the specimen according to method A, and then process the specimen
according to the following procedure for 3 cycles:
a) Store in a drying oven at (70±2) ℃ for 3 days;
b) Store in distilled water at (23±2) ℃ for 1 day;
c) Store in a drying oven at (70±2) ℃ for 2 days;
d) Store in distilled water at (23±2) ℃ for 1 day.
The above procedure can also be changed to c)-d)-a)-b).
The specimens processed by Method B shall be stored under standard test conditions
for at least 24 hours before testing.
NOTE: Method B is a conventional treatment procedure that uses heat and water to affect the curing
speed of the specimen, and is not suitable for giving durability information of sealing materials.
9 Test steps
The test shall be carried out under standard test conditions. All measurements relevant
to the calculation of the elastic recovery are made by using vernier calipers (6.8),
measuring either the distance between the inner surfaces of the substrate that are in
contact with the sealing material, or the distance between the outer surfaces of the
substrate that are not in contact with the sealing material.
Remove the spacer block and measure the initial width Wi at both ends of each specimen.
Put the specimen into the tensile testing machine (6.6) and stretch the specimen at a
speed of (5.5±0.7) mm/min. The tensile elongation rate is 25%, 60%, or 100% of the
initial width (respectively stretched to 15 mm, 19.2 mm, or 24 mm), or a percentage
agreed upon by all parties, using We to represent the width after elongation. Use
appropriate positioning blocks to keep the specimen in a tensile state for 24 hours.
During the test, observe whether there is any damage to the specimen according to the
provisions of 7.3 in GB/T 22083-2008. If there is no damage, remove the positioning
block, place the specimen vertically on a smooth low-friction surface such as a glass
plate sprinkled with talcum powder in the long axis direction, let it stand for 1 hour, and
measure the width-after-recovery Wr at the same position at both ends of each specimen.
If there is any specimen failure, take a spare specimen and repeat the test in this part. If
there is still specimen failure among the three re-tested specimens, then report the test
results in this part as specimen failure.
Calculate the arithmetic mean values of Wi, We, and Wr measured at both ends of each
specimen, respectively.
10 Calculation of test results
The elastic recovery R of each specimen is calculated according to formula (1) and
expressed as a percentage:
where:
R -- elastic recovery, %;
Wi -- the initial width of the specimen, in millimeters (mm);
We -- the width of the specimen after stretching, in millimeters (mm);
Wr -- the width of the specimen after recovery, in millimeters (mm).
The arithmetic mean of the elastic recovery of the three specimens is calculated and
accurate to 1%.
11 Test report
The test report shall indicate the following content:
a) Name of the laboratory and the test date;
b) The number of this part;
c) Sample name, category (chemical type), color, and batch number;
d) Substrate category;
e) Primer used (if used), mixing ratio used (multi-component sample);
f) Specimen processing method (Method A or B);
g) Elongation (%);
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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