GB/T 16777-2008 English PDF (GBT16777-2008)

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GB/T 16777-2008: Test methods for building waterproofing coatings
GB/T 16777-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.120.30
Q 17
Replacing GB/T 16777-1997
Test methods for building waterproofing coatings
ISSUED ON: JUNE 30, 2008
IMPLEMENTED ON: APRIL 01, 2009
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 ... 5
2 Normative references ... 5
3 Standard test conditions ... 5
4 Coating film preparation ... 6
5 Solid content ... 8
6 Heat resistance ... 9
7 Bond strength ... 10
8 Bond strength on wet substrate ... 16
9 Tensile properties ... 17
10 Tear strength ... 21
11 Aging at elongation ... 22
12 Heating stretch rate ... 23
13 Low temperature flexibility ... 25
14 Low temperature bendability ... 27
15 Impermeability ... 29
16 Drying time ... 30
Test methods for building waterproofing coatings
1 Scope
This document specifies the standard test conditions, coating film preparation, solid
content, heat resistance, bond strength, bond strength of wet substrate, tensile properties,
tear strength, aging at constant elongation, heating expansion rate of architectural
waterproof coatings , low temperature flexibility, impermeability, drying time and other
performance test methods.
This Standard applies to building waterproof coatings.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced
document applies.
GB/T 328.10-2007, Test methods for building sheets for waterproofing - Part 10:
Bitumen, plastic and rubber sheets for waterproofing - Water tightness
GB/T 528, Rubber, vulcanized or thermoplastic - Determination of tensile stress-
strain properties (GB/T 528-1998, ISO 37:1994 eqv)
GB/T 529-1999, Rubber, vulcanized or thermoplastic - Determination of tear
strength (Trouser, angle and crescent test pieces) (ISO 34-1:1994 eqv)
GB/T 18244, Test methods for weathering resistance of building waterproof
materials
3 Standard test conditions
Laboratory standard test conditions: temperature is (23±2)℃; relative humidity is
(50±10)%.
Strict conditions: temperature is (23±2)℃; relative humidity is (50±5)%.
6.2 Test steps
After stirring the sample evenly, apply the sample in 2~3 times according to the
requirements of the manufacturer (the interval between each time shall not exceed 24h)
on the cleaned aluminum plate. The coating area is 100mm×50mm. The total thickness
is 1.5mm. Scrape the surface one last time. Carry out maintenance according to the
conditions in Table 1. Demolding is not required. Then hang the aluminum plate
vertically in an electric blast drying oven that has been adjusted to the specified
temperature. The distance between the test piece and the wall of the drying box is not
less than 50mm. The center of the test piece shall be at the same position as the probe
of the thermometer. After standing at the specified temperature for 5h, take it out.
Observe surface phenomena. Test 3 test pieces in total.
6.3 Result evaluation
After the test, all test pieces shall not flow, slide, or drip. There are no dense bubbles on
the surface of the test piece.
6.4 Test report
The test report shall contain the following information:
a) Chapter numbers of this Standard;
b) Determination of all necessary details of the test product;
c) Information about preparation of test piece;
d) Test temperature and time;
e) Test results;
f) Differences in methods used or abnormalities encountered during the test;
g) Test date.
7 Bond strength
7.1 Method A
7.1.1 Test apparatus
7.1.1.1 Tensile testing machine: the measured value is between (15-85)% of the range;
the indication accuracy is not less than 1%; the tensile speed is (5±1)mm/min.
7.1.1.2 Electric blast oven: temperature control accuracy is ±2℃.
7.1.1.3 Special metal clamps for stretching: upper clamps, lower clamps and backing
the prepared coating to the section of the mortar block. Conduct butt joint of the cross
sections of the two mortar blocks. Press them tightly. The thickness of the coating
between the mortar blocks shall not exceed 0.5mm. Place under standard test conditions
for 4h. Cure the prepared test pieces. The condition is at the temperature of (20±1)℃.
The relative humidity is not less than 90%. Cure for 168h. Prepare five test pieces.
Place the cured test pieces under standard test conditions for 2h. Install the test piece
on the testing machine. Keep the center line of the vertical direction of the test piece
surface and the center of the fixture of the testing machine on the same line. Stretch at
a speed of (5±1)mm/min until the test piece fails. Record the maximum tensile force of
the test piece. The test temperature is (23±2)°C.
Result calculation and test report are according to Chapter 7.
9 Tensile properties
9.1 Test apparatus
9.1.1 Tensile testing machine: the measured value is between (15~85)% of the
measuring range; the indication accuracy is not less than 1%; the elongation range is
greater than 500mm.
9.1.2 Electric blast drying oven: temperature control accuracy is ±2℃.
9.1.3 Punching machine and dumbbell type I cutter that meets the requirements of GB/T
528.
9.1.4 Ultraviolet box: 500W straight tube mercury lamp. The lamp tube is parallel to
the bottom of the box. The distance from the surface of the test piece is (47~50)cm.
9.1.5 Thickness gauge: the contact surface diameter is 6mm; the pressure per unit area
is 0.02MPa; the division value is 0.01mm.
9.1.6 Xenon arc lamp aging test chamber: a xenon arc lamp aging test chamber that
meets the requirements of GB/T 18244.
9.2 Test steps
9.2.1 Untreated tensile properties
According to the requirements of Table 2, cut out the coating film into the dumbbell
type I test piece that meets the requirements of GB/T 528. Draw parallel marking lines
at a distance of 25mm. Use a thickness gauge to measure the thickness of three points
in the middle and both ends of the marked line of the test piece. Take its arithmetic
mean value as the thickness of the test piece. Adjust the distance between the clamps of
the tensile testing machine to about 70mm. Clamp the test piece on the testing machine.
GB/T 528. Carry out the tensile test according to 9.2.1.
For water-based coatings, after soaking, take them out and wipe them dry. Then place
them in an electric blast oven at (60±2)°C for 6h±15min. Take out and place under
standard test conditions for (18±2)h. Cut out the dumbbell type I test piece that meets
the requirements of GB/T 528. Carry out the tensile test according to 9.2.1.
9.2.5 Tensile properties after UV treatment
Place six (120×25mm rectangular test pieces) cut according to Table 2 flat on the glazed
tile. To prevent sticking, talcum powder can be sprinkled on the surface of the glazed
tile. Put the test piece into the UV box. The temperature of the space about 50mm away
from the surface of the test piece is (45±2)℃. Conduct constant temperature irradiation
for 240h. Take out an...