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GB/T 24970-2020

Chinese Standard: 'GB/T 24970-2020'
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BASIC DATA
Standard ID GB/T 24970-2020 (GB/T24970-2020)
Description (Translated English) Delineator
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard P66
Classification of International Standard 93.080.30
Word Count Estimation 18,124
Date of Issue 2020-03-06
Date of Implementation 2020-10-01
Older Standard (superseded by this standard) GB/T 24970-2010
Drafting Organization Highway Research Institute of the Ministry of Transport, Zhonglu Gaoke Traffic Inspection and Certification Co., Ltd., Shaoxing Xinhongji Traffic Facilities Co., Ltd.
Administrative Organization National Traffic Engineering Facilities (Highway) Standardization Technical Committee (SAC / TC 223)
Regulation (derived from) National Standards Bulletin No. 1 of 2020
Proposing organization National Traffic Engineering Facilities (Highway) Standardization Technical Committee (SAC/TC 223)
Issuing agency(ies) State Administration of Market Supervision and Administration, National Standardization Administration

GB/T 24970-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 93.080.30
P 66
Replacing GB/T 24970-2010
Delineator
轮廓标
ISSUED ON: MARCH 06, 2020
IMPLEMENTED ON: OCTOBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 Product Classification ... 6
5 Technical Requirements ... 6
6 Test Methods ... 14
7 Inspection Rules ... 21
8 Marking, Packaging, Transportation and Storage ... 22
Delineator
1 Scope
This Standard stipulates the product classification, technical requirements, test
methods, inspection rules as well as marking, packaging, transportation and storage
of the delineator.
This Standard is applicable to delineator set up in China’s highways and urban roads;
while parking lots and other places where delineator need to be set may be
implemented by reference.
2 Normative References
The following documents are essential to the application of this document. For the
dated documents, only the versions with the dates indicated are applicable to this
document; for the undated documents, only the latest version (including all the
amendments) are applicable to this document.
GB/T 228.1 Metallic Materials - Tensile Testing - Part 1: Method of Test at Room
Temperature
GB/T 2893.4 Graphical Symbols - Safety Colors and Safety Signs - Part 4:
Colorimetric and Photometric Properties of Safety Sign Materials
GB/T 3681 Plastics - Methods of Exposure to Direct Weathering, to Weathering
Using Glass-Filtered Daylight, and to Intensified Weathering by Daylight Using
Fresnel Mirrors
GB/T 3880.1 Wrought Aluminum and Aluminum Alloy Plates, Sheets and Strips for
General Engineering - Part 1: Technical Conditions of Delivery
GB/T 3978 Standard Illuminants and Geometric Conditions
GB/T 3979 Methods for the Measurement of Object Color
GB/T 9286 Paints and Varnishes - Cross Cut Test for Films
GB/T 10125 Corrosion Tests in Artificial Atmospheres - Salt Spray Tests
GB/T 18226 Specification for Steel Component Anticorrosion of Highway
Engineering
3.4 Persistence luminous
The brightness of self-luminous marks at a certain moment in the persistence time.
4 Product Classification
According to the setting conditions, the delineators are divided into post delineator
buried on the ground and attached delineator attached to the structure. According to
the shape of the reflector, the delineators are divided into trapezoidal, circular and
rectangular delineator. According to the color, the delineators are divided into white
and yellow delineator.
5 Technical Requirements
5.1 Structural dimension
5.1.1 Post delineator
5.1.1.1 The post delineator is composed of a cylinder, a black mark and a reflector;
and the three parts shall be firmly connected. The cylinder is white. There shall be a
250mm long black mark on the upper part of the cylinder. There shall be a
180mm×40mm rectangular reflector in the middle of the black mark. Energy storage
self-luminous material may be added on the basis of the reflector.
5.1.1.2 The cross-section of the cylinder is an isosceles triangle or a circular arc with
hollow fillets.
5.1.1.3 When the post cross section is an isosceles triangle, the height of the post is
1250mm; the height of the triangle is 120mm; and the length of the base-edge is
100mm. See Figure 1 for dimensions and errors.
When the reflector is a micro-prism reflector, it shall not be penetrated by water or mist.
5.9 Salt spray corrosion resistance
After the salt spray corrosion resistance test, there shall be no signs of discoloration,
blistering, rust or erosion for each component. The reflector shall not be infiltrated by
water or mist; the reflective film shall not leak, or its edges shall be peeled off; the
energy storage self-luminous material shall not appear traces such as chalking, spots,
bubbles, cracks or uneven appearance.
5.10 High and low temperature resistance
After the high and low temperature resistance test, there shall be no signs of damage
such as cracks, flaking, chipping, blistering, warping or deformation.
5.11 Weather resistance
After continuous natural exposure or artificial accelerated aging test:
a) There should be no obvious cracks, nicks, bubbles, rust, erosion, peeling,
discoloration, chalking, or deformation on the delineator.
b) The chromaticity coordinates and luminance factors of the various colors of the
delineator shall be kept within the range specified in Table 1 or Table 2.
c) The reflector shall not show any signs of water penetration; the reflective film
shall not show the phenomenon of peeling off the edge; the energy storage self-
luminous material shall not show signs of chalking, spots, bubbles, cracks or
uneven appearance.
d) The luminous intensity coefficient value of the reflector shall be no lower than 50%
of the corresponding specified value in Table 3 or Table 4; the retroreflective
coefficient value of the reflective film shall be no lower than 80% of the
corresponding specified value in Table 5; the luminous properties of energy
storage self-luminous material shall be maintained at more than 75% before the
test; the energy storage self-luminous material shall not show signs of chalking,
spots, bubbles, cracks or uneven appearance.
6 Test Methods
6.1 Test preparation
6.1.1 Preparation of specimen
The preparation of the specimen is as follows:
a) Randomly extract the overall product of the delineator, or intercept a section of
the cylindrical delineator with a complete black mark and reflective material, a
length of no less than 350mm, as a product specimen;
b) Randomly extract the reflector as a reflector specimen;
c) Randomly select the reflective film, generally intercepting 1.22m×0.25m; and
make the reflective film specimen according to the method specified in GB/T
18833;
d) Randomly select the energy storage self-luminous material. Generally,
0.5m×0.5m is taken as the specimen of energy storage self-luminous material.
6.1.2 Test environment
The specimen shall be placed in an environment with a temperature of 23°C±2°C and
a relative humidity of (50±10) %. After being placed for 24h, various test work may be
performed. General test work shall be carried out in an environment with a temperature
of 23°C±2°C and a relative humidity of (50±10) %.
6.2 Structural dimension
The composition of the structure shall be visually inspected’ the external dimensions,
the thickness of the plate, etc. shall be measured with tools such as a ruler and a plate
thickness micrometer whose accuracy and range meet the requirements.
6.3 Appearance quality
6.3.1 Under the condition of daytime indoor illuminance greater than 70lx, visually
inspect the appearance of the product or carefully check it with a 4X magnifier.
6.3.2 Put the blade of the knife-edge ruler close to the surface of the cylinder; measure
the maximum gap between the surface of the cylinder and the blade, which is the
surface unevenness tolerance.
6.4 Mechanical properties of material
6.4.1 The base plate and bracket materials shall be implemented in accordance with
the provisions of the tensile test of metallic materials specified in GB/T 228.1.
6.4.2 Black marking materials shall be implemented in accordance with the provisions
of the cross-cut test specified in GB/T 9286.
6.5 Colorimetric properties
6.5.1 Adopt the D65 standard illuminator and 45/0 lighting observation conditions
specified in GB/T 3978, measure the reflectance of the specimen spectrum according
to the method specified in GB/T 3979; and then calculate the chromaticity coordinates
of the color. Under the same conditions, respectively measure the illuminance of the
specimen and the standard diffuse reflection whiteboard; and the ratio of the two is the
illuminance factor. Or directly measure the chromaticity coordinates and illuminance
factors of various colors.
6.5.2 The standard A light source and lighting observation conditions specified in GB/T
3978 are used: the field angle is 0.1°~1°, the incident angle is 0°, and the observation
angle is 0.2°. According to the method specified in GB/T 3979, measure the reflectance
of the reflector specimen spectrum, and then calculate the chromaticity coordinates of
such color. Or directly measure the chromaticity coordinates of various colors.
6.6 Photometric Properties
6.6.1 Test principle and device
The test is carried out in a dark room. The test principle is shown in Figure 6; and the
schematic diagram of the device is shown in Figure 7. Specifically:
a) The light source adopts the standard A light source specified in GB/T 3978; and
the spread angle of the reference center of the specimen to the light source
aperture shall not exceed 0.2°. The unevenness of the vertical illuminance of the
entire illuminated area of the specimen shall be no greater than 5%.
b) The light detector is an illuminance meter calibrated by the spectral light efficiency
curve, which is installed directly above the light source. The spread angle of the
reference center of the specimen to the photodetector aperture shall be no
greater than 12' [Translator Note: here it should be 12°]. The photodetector shall
be able to move freely up and down to ensure that the observation angle changes
from 0.2° to 1° or in greater range.
c) The distance from the front surface of the photodetector to the sample surface
shall be no less than 15m.
d) Install the reflector specimen or the reflective film specimen of no less than
150mm×150mm on a rotatable sample holder. When it rotates along the second
axis, the specimen can obtain the incident angle β2; when it rotates along the
first axis, the specimen can obtain the incident angle β1.
6.10 Salt spray corrosion resistance
According to the requirements of GB/T 10125, dissolve chemically pure sodium
chloride in distilled water to prepare a (5.0±0.1)% (mass fraction) salt solution (pH
value between 6.5 and 7.2); so that the salt solution is continuously atomized in salt
fog box; and the temperature in the box is maintained at 35°C±2°C. The test surface
of the specimen is at an angle of 30° to the vertical direction; and the two adjacent
samples maintain a certain gap with the line spacing no less than 75mm; and the
product specimen or the reflective film specimen are continuously exposed in the salt
spray space for 120h. After the test, use the running water to wash off the salt deposits
on the surface of the specimen; then rinsed by distilled water; and then placed under
standard test conditions to recover for 2h. Finally, use a 4X magnifier for a
comprehensive inspection.
6.11 High and low temperature resistance
Put the product specimen or the reflective film specimen into the test chamber; start
the cold source; and gradually reduce the temperature in the box to -40°C±3°C; the
specimen is kept at this temperature for 72h. Turn off the power, and let the test box
warm up naturally to room temperature (for about 5h~12h). The temperature of the test
chamber was raised to 70°C±3°C; and maintained at this temperature for 24 hours.
Finally turn off the power, and let the test chamber naturally cool to room temperature.
Take out the specimen and place it under standard test conditions for 2h; then use 4X
magnifier to check the change of its surface.
6.12 Weather resistance
6.12.1 The weather resistance performance test time is:
a) The natural exposure test is 2 years;
b) The artificial weather accelerated aging test is 1200h.
6.12.2 The natural exposure test method is:
a) According to the requirements of GB/T 3681, install the product specimen or the
reflective film specimen (the size of the reflective film specimen shall be no less
than 150mm×250mm) on the surface of exposure rack at least 0.8m above the
ground; with the specimen surface facing due south, and form the local latitude
angle or 45°±1° with the horizontal surface. The surface of the specimen shall
not be shielded by other objects from sunlight, and no water may accumulate on
it.
b) The selection of exposure location is as close as possible to the actual use
environment or represents the place with most severe weather of a certain
climate type.
7.1.2 If one of the following conditions occurs, type inspection shall be carried out:
a) In the formal production process, if there are major changes in raw materials and
processes, which may affect product performance;
b) When the production is restored after more than half a year shutdown;
c) When there is a big difference between the exit-factory inspection result ......
Related standard:   GB 50422-2017  GB/T 31439.1-2015
Related PDF sample:   GB 50688-2011
   
 
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