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GB/T 24721.5-2023 (GB/T24721.5-2023)

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GB/T 24721.5-2023: PDF in English (GBT 24721.5-2023)

GB/T 24721.5-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20; 93.080.30
CCS P 66
Replacing GB/T 24721.5-2009
Glass Fiber Reinforced Plastic Product for Highway - Part
5: Sign Base Panel
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: JULY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
Introduction ... 5
1 Scope ... 6
2 Normative References ... 6
3 Terms and Definitions ... 6
4 Structures, Dimensions and Deviations ... 6
5 Technical Requirements ... 7
6 Test Methods ... 9
7 Inspection Rules ... 12
8 Marking, Packaging, Transportation and Storage ... 13
Appendix A (normative) Setup Requirements for Overall Load Traction Device ... 14
Glass Fiber Reinforced Plastic Product for Highway - Part
5: Sign Base Panel
1 Scope
This document specifies the product structures, dimensions and deviations, technical
requirements, test methods, inspection rules, as well as marking, packaging, transportation and
storage requirements for glass fiber reinforced plastic sign base panel for highway.
This document is applicable to the production, inspection and usage of glass fiber reinforced
plastic sign base panel for highway (hereinafter referred to as “glass fiber reinforced sign base
panel”).
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB 5768.2 Road Traffic Signs and Markings - Part 2: Road Traffic Signs
GB/T 18226 Specification for steel component anticorrosion of highway engineering
GB/T 23827 Road Traffic Sign Plate and Support
GB/T 24721.1-2023 Glass Fiber Reinforced Plastic Product for Highway - Part 1: General Rule
3 Terms and Definitions
This document does not have terms or definitions that need to be defined.
4 Structures, Dimensions and Deviations
4.1 The glass fiber reinforced sign base panel with a diameter or longest side not greater than
1,000 mm should be integrally formed, and the thickness shall not be less than 2 mm; the
thickness of the base panel of other sizes shall not be less than 3 mm. When the base panel is
formed by splicing, the minimum distance between the edge of any spliced screw hole on the
base panel and the edge of the base panel and the splicing seam shall not be less than 20 mm,
and the thickness of the base panel shall not be less than 3 mm. When the base panel is formed
by splicing or the thickness of the base panel is less than 3 mm, reinforcement shall be adopted.
In accordance with the stipulations of 6.2 in GB/T 24721.1-2023, conduct the test.
6.3 Test Instruments and Equipment
In accordance with the stipulations of 6.3 in GB/T 24721.1-2023, conduct the test.
6.4 Specimen
6.4.1 General requirements
In accordance with the stipulations of 6.4 in GB/T 24721.1-2023, conduct the test.
6.4.2 Special stipulations
6.4.2.1 The impact resistance and overall load test is tested with formed sign base panel.
6.4.2.2 For the tensile strength and flexural strength tests, the same number of specimens shall
be respectively taken from the sign base panel in the vertical and horizontal directions; the
minimum number of specimens in each group for the test of each property is 5 PCS, and the
number of specimens for the flexural strength test in type inspection shall not be less than 6
groups of 30 PCS in both vertical and horizontal directions.
6.5 Structural and Dimensional Deviations
In accordance with the stipulations of GB/T 23827, conduct the test.
6.6 Appearance Quality
Freely place the sign base panel on the test platform with its face up, use a 1 m ruler to measure
the maximum gap between any point on the panel surface and the ruler to obtain the unevenness
of the panel surface. The rest of the test methods shall comply with the stipulations of 6.5 in
GB/T 24721.1-2023.
6.7 General Physical and Mechanical Properties
6.7.1 Tensile strength
In accordance with the stipulations of 6.6.1 in GB/T 24721.1-2023, conduct the test.
6.7.2 Compressive strength
In accordance with the stipulations of 6.6.2 in GB/T 24721.1-2023, conduct the test.
6.7.3 Flexural strength
In accordance with the stipulations of 6.6.3 in GB/T 24721.1-2023, conduct the test.
6.7.4 Impact strength
In accordance with the stipulations of 6.6.4 in GB/T 24721.1-2023, conduct the test.
6.7.5 Density
In accordance with the stipulations of 6.6.5 in GB/T 24721.1-2023, conduct the test.
6.7.6 Barcol hardness
In accordance with the stipulations of 6.6.6 in GB/T 24721.1-2023, conduct the test.
6.7.7 Load deformation temperature
In accordance with the stipulations of 6.6.7 in GB/T 24721.1-2023, conduct the test.
6.8 Flame-retardant Properties
In accordance with the stipulations of 6.7 in GB/T 24721.1-2023, conduct the test.
6.9 Smoke Density
In accordance with the stipulations of 6.8 in GB/T 24721.1-2023, conduct the test.
6.10 Impact resistance
Place the specimen under the standard environmental conditions and adjust for 24 h before
testing. The specimen shall be placed flat on the hard ground or on the test bench. Use a 1 kg 
50 g steel ball to freely drop from a height of 1 m from the panel surface to impact the specimen.
Ensure that the steel ball contacts the specimen only once during the impact process. The impact
point shall be selected from the center point of the specimen and 5 points evenly distributed up,
down, left and right. The distance between the impact point and the edge is not less than 80 mm.
6.11 Water Resistance
In accordance with the stipulations of 6.10 in GB/T 24721.1-2023, conduct the test.
6.12 Acid Resistance
In accordance with the stipulations of 6.11.2 in GB/T 24721.1-2023, conduct the test.
6.13 Environmental Adaptability
6.13.1 Damp heat resistance
In accordance with the stipulations of 6.12.1 in GB/T 24721.1-2023, conduct the test.
6.13.2 Resistance to low-temperature impact
In accordance with the stipulations of 6.12.2 in GB/T 24721.1-2023, conduct the test.
6.13.3 Resistance to low-temperature drop
In accordance with the stipulations of 6.12.3 in GB/T 24721.1-2023, conduct the test.
6.13.4 Resistance to artificial accelerated aging (xenon arc light source)
In accordance with the stipulations of 6.12.4.1 in GB/T 24721.1-2023, conduct the test.
6.13.5 Resistance to artificial accelerated aging (fluorescent ultraviolet light source)
In accordance with the stipulations of 6.12.4.2 in GB/T 24721.1-2023, conduct the test.
6.13.6 Resistance to natural exposure
In accordance with the stipulations of 6.12.4.3 in GB/T 24721.1-2023, conduct the test.
6.14 Overall Load
6.14.1 Place the glass fiber reinforced sign base panel on two 400 mm  50 mm horizontal
support surfaces covered with rubber sheets (with a Shore A hardness of 65 ~ 70 and a thickness
of 8 mm ~ 10 mm), and ensure that the outer edge of the base panel and the outer edge of the
support surface are in the same vertical plane, and the base panel is arranged as symmetrically
as possible between the support surfaces and has the largest span.
6.14.2 Assemble all the connecting bolts on the base panel on the connecting piece in
accordance with the product assembly instructions. Take the midpoint of the connecting piece
as the mechanical traction point; use a rigid connection medium to firmly connect the traction
system of the mechanical testing machine through fixed pulleys; ensure that the lower edges of
two fixed pulleys are on the same straight line; perform vertical traction to the base panel. The
test traction device shall comply with the stipulations of Appendix A. When the connection
medium is completely loosened, at a speed of 100 mm/min, pull it, until the panel surface is
broken or when the maximum load has been reached, then, stop the test. The sum of the
maximum tensile load and the mass of the connecting piece, and the mass of the vertical part
of the connecting medium is the overall load.
6.15 Corrosion Resistance of Steel Components
In accordance with the stipulations of GB/T 18226, conduct the test.
6.16 Retention Rate of Material Properties
In accordance with the stipulations of 6.13 in GB/T 24721.1-2023, conduct the test.
6.17 Test Results
In accordance with the stipulations of 6.14 in GB/T 24721.1-2023, conduct the test.
7 Inspection Rules
The inspection rules shall comply with the stipulations of Chapter 7 in GB/T 24721.1-2023.
The type inspection and exit-factory inspection items of glass fiber reinforced sign base panel
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.