561Ew
-
Upload
muhammad-masood-abbas -
Category
Documents
-
view
214 -
download
0
Transcript of 561Ew
-
7/31/2019 561Ew
1/11
GULF STANDARD GS 603/2000
1
GS 561
ROAD MARKING PAINTS
TEST METHODS
-
7/31/2019 561Ew
2/11
GULF STANDARD GS 603/2000
2
ROAD MARKING PAINTS
TEST METHODS
ICS: 87.040
Date of GSMO Board of Directors Approval : 1415(H)-06-13 (1994-11-16)
-
7/31/2019 561Ew
3/11
GULF STANDARD GS 561/1994
1
ROAD MARKING PAINTS
TEST METHODS
1. SCOPE AND FIELD OF APPLICATION
This Gulf standard includes methods of test for road marking paints used on
asphalt and concrete surfaces.
2. COMPLEMENTARY REFERENCES
2.1. GS 452/1994 Road Marking Paints.
2.2 GS...../...... Solid Glass Beads Additive to Thermoplastic Which Used in
Road Marking.
2.3 GS 498/1994 Methods of Test for Paints and Varnishes - Preparation of Test
Panels Before Coating.
2.4 GS...../...... Methods of Test for Paints and Varnishes - Examination and
Preparation of Test Samples.
2.5 GS...../...... Methods of Test for Emulsion Paints and Varnishes.
2.6 GS...../...... Methods of Test for Paints and Varnishes - Effect of
Weathering on Paints.
2.7 GS...../...... Methods of Test for Paints and Varnishes - Resistance of
Paint Coatings to Washing and Scrubbing.
2.8 GS...../...... Methods of Test for Paints and Varnishes - Scratching Test.
3. EXAMINATION AND PREPARATION OF TEST SAMPLES
Examine and prepare test samples according to the Gulf standard mentioned in
(2.4).
4. PREPARATION OF TEST PANELS BEFORE COATING AND PAINT
OPERATION
4.1 Test panels
Prepare test panels before coating according to the Gulf standard mentioned in
(2.3),
4.2 Paint operation
The test panel shall be coated with 200 m wet thickness paint coat, using paint
knife or any suitable device. Let the paint to dry for a period of 7 days far from
direct sunlight, dust or foreign matter, at a temperature of 25 2o
C and60 5% relative humidity unless otherwise provided in the standard.
-
7/31/2019 561Ew
4/11
GULF STANDARD GS 561/1994
2
4.3 Test conditions
Control the test under the following conditions unless otherwise provided:
Temperature (25 2o
C).
Relative humidity 60 5%.
5. APPROVED SAMPLE
For laboratory test purposes, samples shall be taken from the produced or
imported batch, the manufacturer's store or at the working area in the presence
of representatives of the supervising body, the contractor, and the manufacturer.
Samples shall be packed in clean, intact and tightly sealed containers that do not
react with the paint components. Such containers shall not be less than one litre
in size and shall carry the batch number.
6. TEST AND INSPECTION
6.1 Retention of solid glass beads
6.1.1 Principle
Glass beads shall be allowed to fall onto the paint layer before it is dry, and the
mass of beads retained shall be determined after 1 h and after 7 days.
6.1.2 Apparatus and materials
Solid glass beads, according to the Gulf standard mentioned in (2.2).
Dispenser, comprising two plates, one fixed and one movable, and two
screens for beads distribution. The plates are 3 mm in thickness, and
perforated with similar holes of 4 mm diameter (see Fig. 1).
Container, of base 70 mm x 150 mm x 40 mm.
Glass test panel, prepared as in item (4).
Suitable scrubbing brush.
Scrubbing apparatus (see fig. 2).
6.1.3 Procedure
Fix the perforated movable plate in such a way as to be under the fixed
plate with its perforations not directly under the fixed plate. Scatter a
suitable quantity (ca 4 gm) of solid glass beads (using a brush) enough to
fill the space between the two plates. Work out the dispenser by sliding
the movable plate till the holes meet together, then the sieves will
distribute the beads in a regular way.
Fix the container in the dispenser centre, put the dispenser to work again
as stated above, weigh the container to nearest mg (m1), return the beads
to the dispenser using the brush to ensure that all beads have returned tothe dispenser.
-
7/31/2019 561Ew
5/11
GULF STANDARD GS 561/1994
3
Prepare the test plate and coat with the paint to be tested. Put the test
plate in the dispenser centre, adjust the perforated movable plate to allow
the solid glass beads, to fall freely on the coated plate, note that this step
does not consume more than 20 seconds, let stand for about one hour.
Remove the dispenser and, using the scrubbing brush, lightly brush the
paint panel. Collect any non-adherent glass beads in paint coat and weigh
the beads to the nearest milligram (m2).
Keep the painted test panel, with the adhering glass beads, at 25 2oC
and 60 5% relative humidity for 7 days.
Weigh the test panel to the nearest milligram (m3).
Fix the test panel uppermost on the scrubbing apparatus (see Fig. 2) so as
to be under the scrubbing brush. Allow the scrubbing brush to come in
toutch with the paint coating. Place a 500 gweight on the scrubbingbrush, and start the scrubbing apparatus for 100 revolutions.
Weigh the test panel to the nearest milligram (m4) and measure the total
and the brushed areas of the paint test panel to the nearest square
millimeter.
Calculate percentage of the glass beads removed by the equation:
100 x (m3 - m4) x At
Percentage of beads removed =
(m1 - m2) x As
Where:
AS is the area scrubbed by the brush.
At is the area of the beaded paint panel.
m1 is the mass (in g) of the glass beads discharged by the dispenser over the
test area.
m2 is the mass (in g) of the non-adherent glass beads.
m3 is the mass (in g) of the glass test panel before brushing.
m4 is the mass (in g) of the glass test panel after brushing.
6.2 Determination of luminance factor
Determination of luminance factor shall be according to the method described in
the Gulf standard mentioned in (2.2), provided that the test panel and the test
sample shall be prepared as in item (4).
6.3 Abrasion resistance
6.3.1 PrincipleAllow the grit to impinge on the paint coating then examine it for damage.
-
7/31/2019 561Ew
6/11
GULF STANDARD GS 561/1994
4
6.3.2 Apparatus and materials
Standard sand grit according to the American standard.
Funnel, with an orifice of 203.2 mm diameter and internal diameter of 91mm for the open end to which is attached a straight tube of the same
internal diameter (see Fig. 3). The tube is fitted with a shutter of an
aperture diameter 91 mm immediately below the funnel and 0.9 mm away
from the open end of the tube.
Stand, for holding the funnel and the attached tube in a vertical position.
Stand, suitable for holding the test panel at an angle of 45o to the
horizontal.
6.3.3 Procedure
Prepare the glass test panel as described in item (4).
Secure the test panel at an angle of 45o to the horizontal.
Place the funnel in the stand in such a manner that the bottom of the tube
is 25 mm from the paint film and not less than 25 mm from the edge of the
test panel.
Close the shutter and place 2 litres from the grit in the funnel.
Open the shutter fully and rapidly to allow the grit to fall down the tube in
a continuous stream and impinge the paint film, repeat this procedure.
Remove the panel after two passes of grit and examine by the naked eyeto determine whether the test panel can be seen through the paint coating.
6.4 Weathering resistance
6.4.1 Preparation of test panels
Test panels shall be used and prepared according to the Gulf standard
mentioned in (2.5), and the test shall be carried out as described in the Gulf
standard mentioned in (2.6).
6.5 Bleeding resistance
6.5.1 Principle
The paint is applied to the bitumen surface and the paint film is examined for
discolouration after 72 h.
6.5.2 Apparatus and materials
Bitumen according to approved standards, in a quantity sufficient to fill a
metal tray to a depth of at least 6 mm.
Metal tray, of minimum size 150 x 200 mm x 6 mm. The walls of the tray
should be uniform.
Hot plate, capable of maintaining a temperature of 571 10oC.
Straightedge knife of steel with a minimum length of 200 mm.
-
7/31/2019 561Ew
7/11
GULF STANDARD GS 561/1994
5
6.5.3 Procedure
Heat the bitumen in the metal tray on the hot plate, to 175 10oC. When
the bitumen is molten, spread it with the straightedge knife to give a
smooth surface, level with the walls of the tray.
Allow the bitumen to cool and condition at a temperature of 52 2oC for
42 h.
Secure a strip of transparent tape of 25 mm width across the bitumen
surface, approximately 25 mm from and parallel to the 200 mm side of the
metal tray.
Place two steel shims of a thickness 350 so as to make a right angle
with the tape edge with 40 mm distance between them.
With the aid of a doctor blade, apply a film of the paint across the tapeand over the bitumen surface with one pass of the blade. Allow the Paint
film to dry in a horizontal position at 25 2oC and 60 5% relative
humidity for 72 h.
Examine the paint film over bitumen and on the transparent tape.
Record the difference in colour, if any.
6.6 Resistance to petroleum materials
6.6.1 Principle
Place drops from petroleum materials (kerosene) on the paint film for 24 h, and
examine to detect any change in characteristics.
6.6.2 Materials
Kerosene, absorbent paper.
6.6.3 Procedure
Prepare two glass test panels and coate them with the paint to be
examined as described in item (4).
Allow to dry for 72 h. Place drops from kerosene, about 0.5 mm each, on
one panel and leave for 24 h.
Clean kerosene drops on the panel with the absorbent paper.
Examine the film by the naked eye for presence of blistering, breaking,
tenderness or deterioration, using the non-immersed film as a reference.
6.7 Resistance to washing with scrubbing using tap water
6.7.1 Preparation of test panels
Test panels shall be prepared and used as described in the Gulf standard
mentioned in (2.7).
-
7/31/2019 561Ew
8/11
GULF STANDARD GS 561/1994
6
6.8 Resistance to salt solution
6.8.1 Principle
The paint to be tested shall be applied to a glass test panel which is subsequentlyimmersed in a saline solution for 24 h. The resistance of the film to scratch shall
be immediately assessed and after a recovery period, changes in other properties
shall be determined.
6.8.2 Materials
Sodium chloride solution 10% (w/w).
Absorbent paper.
6.8.3 Procedure
Prepare two glass test panels and coat with the paint to be tested as in
item 4 and allow them to dry for 72 h.
One of the test panels is immersed for 24 h, in a suitable container
containing 10% sodium chloride solution. The container shall be covered
during this period.
Remove the panel from the solution and dry with the absorbent paper.
Allow a period of 5 min then carry out the scratch test as described in the
Gulf standard mentioned in 2.8, using a load of 1 kg. Examine the paint
films for penetration to the substrate and report the results.
Allow the test panel to stand for another period of 3 h, then re-examine
the paint film by the naked eye for signs of change in colour or blistering,
using the nonimmersed test panel for comparison and report occurance of
any deterioration. Also examine the paint film for any signs of tenderness
or crispiness, using the nonimmersed test panel for comparison, and
report occurance of any deterioration.
-
7/31/2019 561Ew
9/11
GULF STANDARD GS 561/1994
7
-
7/31/2019 561Ew
10/11
GULF STANDARD GS 561/1994
8
-
7/31/2019 561Ew
11/11
GULF STANDARD GS 561/1994
9