GB/T 13477.8-2017 PDF English
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| GB/T 13477.8-2017 | English | 165 |
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Test method for building sealants -- Part 8: Determination of tensile properties
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| GB/T 13477.8-2002 | English | 359 |
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Test method for building sealants -- Part 8: Determination of tensile properties
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GB/T 13477.8-2017: Test method for building sealants -- Part 8: Determination of tensile properties---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/GBT13477.8-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.50
Q 24
Replacing GB/T 13477.8-2002
Test method for building sealants - Part 8: Determination of
tensile properties
[ISO 8339:2005, Building construction - Sealants - Determination of tensile properties
(Extension to break), MOD]
ISSUED ON: MAY 31, 2017
IMPLEMENTED ON: APRIL 01, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Principle ... 6
5 Standard test conditions ... 6
6 Test instruments ... 7
7 Preparation of specimens ... 7
8 Treatment of specimens ... 9
9 Test procedure ... 10
10 Calculation of test results ... 10
11 Test report ... 11
Annex A (informative) Structural changes in this Part compared with ISO 8339:2005
... 13
Annex B (informative) Technical differences between this Part and ISO 8339:2005 and
their reasons ... 14
Test method for building sealants - Part 8: Determination of
tensile properties
1 Scope
This Part of GB/T 13477 specifies the method for the determination of the tensile
properties of building sealants.
This Part applies to the determination of the secant tensile modulus of building sealants,
as well as the maximum tensile strength when extension to break, the elongation at
break, and the bonding condition with substrates.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
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)
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 14682
apply.
4 Principle
Bond the sealant to be tested between the surfaces of two parallel substrates to make a
specimen. Extend the specimen until break, plot a force value-elongation value curve,
and express the tensile properties of the sealant with the calculated secant tensile
modulus, maximum tensile strength, and elongation at break.
5 Standard test conditions
The standard test conditions are: temperature of (23 ± 2) ℃, relative humidity of (50 ±
5) %.
6 Test instruments
6.1 Bonding substrate: The cement mortar board, aluminum plate or glass plate that
comply with the provisions of GB/T 13477.1, used to prepare specimens. The shape
and dimension 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
dimensions can also be selected as agreed upon by all parties, but the bonding
dimension and area of the embedded sealant sample shall be the same with those shown
in Figures 1 and 2.
6.2 Isolation pad: The surface shall be anti-adhesive. It is used to prepare sealant
specimens with a cross-section of 12 mm × 12 mm (as shown in Figures 1 and 2).
6.3 Bond breaker: Anti-adhesive film or paper, such as polyethylene (PE) film, which
should be selected according to the recommendations of the sealant manufacturer. It is
used to prepare specimens.
6.4 Tensile testing machine: It is equipped with a recording device. It is capable of
extending the specimen at a speed of (5.5 ± 0.7) mm/min.
6.5 Low temperature test chamber: It can accommodate the specimen for tensile test at
(-20 ± 2) ℃.
6.6 Blast drying oven: The temperature can be adjusted to (70 ± 2) ℃, for treatment of
specimens according to method B (see 8.3).
6.7 Container: It is used to hold distilled water, for immersing specimens according to
method B (see 8.3).
7 Preparation of specimens
Use degreasing gauze to remove dust from the surface of the cement mortar board. Use
solvents such as acetone to clean the aluminum plate and glass plate and dry them.
Prepare specimens in accordance with the instructions (e.g., whether to use primer and
mixing procedure of multi-component sealants) of the sealant manufacturer.
Keep the sealant and substrates at (23 ± 2) ℃. Prepare 3 specimens for each category
of substrate and each test temperature.
As shown in Figures 1 and 2, assemble two bonding substrates and two isolation pads
on the bond breaker to form a cavity. Then the sealant sample is embedded in the cavity
to make a specimen. The following matters shall be noted when embedding the sample:
a) avoid the formation of bubbles;
b) store in distilled water at (23 ± 2) ℃ for 1 d;
c) store in a drying oven at (70 ± 2) ℃ for 2 d;
d) store in distilled water at (23 ± 2) ℃ for 1 d.
The above procedure can also be changed to the order of c)-d)-a)-b).
The specimens treated by method B shall be placed under standard test conditions for
at least 24 h before test.
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 information on the durability of the sealant.
9 Test procedure
9.1 General
The test is carried out at two temperatures: (23 ± 2) ℃ and (-20 ± 2) ℃. Test 3
specimens at each test temperature.
9.2 Tensile properties at (23 ± 2) ℃
Remove the isolation pads on the specimen, load the specimen into the tensile testing
machine, and extend the specimen to break at (23 ± 2) °C at a speed of (5.5 ± 0.7)
mm/min. Record the force value-extension value curve and break type.
9.3 Tensile properties at (-20 ± 2) ℃
Before the test, the specimen shall be placed at a temperature of (-20 ± 2) ℃ for 4 h.
Remove the isolation pads on the specimen, load the specimen into the tensile testing
machine, and extend the specimen to break at (-20 ± 2) °C at a speed of (5.5 ± 0.7)
mm/min. Record the force value-extension value curve and break type.
10 Calculation of test results
10.1 Secant tensile modulus
The secant tensile modulus (σ) of each specimen at selected elongation is calculated
according to formula (1). It takes the arithmetic mean of 3 specimens, accurate to 0.01
MPa.
where:
σ - the secant tensile modulus, in megapascal (MPa);
F - the force value at selected elongation, in Newton (N);
S - the initial cross-sectional area of the specimen, in square millimeters (mm2).
10.2 Maximum tensile strength
The maximum tensile strength (TS) of each specimen is calculated according to formula
(2). It takes the arithmetic mean of 3 specimens, accurate to 0.01 MPa.
where:
TS - the maximum tensile strength, in megapascal (MPa);
P - the maximum pulling force value, in Newton (N);
S - the initial cross-sectional area of the specimen, in square millimeters (mm2).
10.3 Elongation at break
The elongation at break (E) of each specimen is calculated according to formula (3),
expressed as a percentage. It takes the arithmetic mean of 3 specimens, accurate to 5 %.
where:
E - the elongation at break, %;
W0 - the initial width of the specimen, in millimeters (mm);
W1 - the width of the specimen at break, in millimeters (mm).
11 Test report
The test report shall indicate the following:
a) name of the laboratory and test date;
b) serial number of this Part;
c) name, category (chemical type), and color of the sample;
d) substrate category (see 6.1);
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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