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GB/T 24721.2-2023 (GBT24721.2-2023)

GB/T 24721.2-2023_English: PDF (GBT 24721.2-2023, GBT24721.2-2023)
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GB/T 24721.2-2023English230 Add to Cart 0--9 seconds. Auto-delivery Glass fiber reinforced plastic product for highway -- Part 2: Trunk Valid GB/T 24721.2-2023

BASIC DATA
Standard ID GB/T 24721.2-2023 (GB/T24721.2-2023)
Description (Translated English) Glass fiber reinforced plastic product for highway -- Part 2: Trunk
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard P66
Classification of International Standard 03.220.20, 93.080.30
Word Count Estimation 15,162
Date of Issue 2023-03-17
Date of Implementation 2023-07-01
Older Standard (superseded by this standard) GB/T 24721.2-2009
Drafting Organization Highway Research Institute of the Ministry of Transport, Zhonglu Gaoke Traffic Inspection and Certification Co., Ltd.
Administrative Organization National Transportation Engineering Facilities (Highway) Standardization Technical Committee (SAC/TC 223)
Issuing agency(ies) National Transportation Engineering Facilities (Highway) Standardization Technical Committee (SAC/TC 223)

Standards related to: GB/T 24721.2-2023

GB/T 24721.2-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 03.220.20; 93.080.30
CCS P 66
Replacing GB/T 24721.2-2009
Glass Fiber Reinforced Plastic Product for Highway - Part
2: Trunk
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 Product Classification, Structures, Dimensions, Deviations and Model ... 6
5 Technical Requirements ... 8
6 Test Methods ... 10
7 Inspection Rules ... 12
8 Marking, Packaging, Transportation and Storage ... 13
Appendix A (informative) Schematic Diagram of Structural Forms and Parts of Glass
Fiber Reinforced Trunks ... 14
Appendix B (normative) Determination Method for Static Friction Coefficient of Inner
Wall of Trunk ... 16
Foreword
This document was drafted in accordance with the rules provided in GB/T 1.1-2020 Directives
for Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document is Part 2 of GB/T 24721 Glass Fiber Reinforced Plastic Product for Highway.
GB/T 24721 has issued the following parts:
---Part 1: General Rule;
---Part 2: Trunk;
---Part 3: Duct;
---Part 4: Non-pressure Communications Well Lid;
---Part 5: Sign Base Panel.
This document serves as a replacement of GB/T 24721.2-2009 Glass Fiber Reinforced Plastic
Product for Highway - Part 2: Trunk. In comparison with GB/T 24721.2-2009, apart from
structural adjustments and editorial modifications, the main technical changes are as follows:
a) Production classification is modified (see 4.1; 3.1 of Version 2009);
b) The requirements for the structure and dimensions are modified (see 4.2.1; 3.2.1 of
Version 2009);
c) The requirements for the deviations are modified (see 4.2.2; 3.2.2 of Version 2009);
d) The requirements for the product model are modified (see 4.3; 3.3 of Version 2009);
e) The technical requirements for tensile strength, flexural strength, impact strength and
density in general mechanical properties are modified (see Table 2; Table 2 of Version
2009);
f) The technical requirements and test methods for flame retardancy are modified (see
Table 2 and 6.8; Table 2 and 5.5.4 of Version 2009);
g) The technical requirements and test methods for smoke density are added (see Table
2 and 6.9);
h) The technical requirements and test methods for adhesion performance are added (see
Table 2 and 6.10);
i) The technical requirements and test methods for resistance to artificial accelerated
aging (fluorescent ultraviolet light source) are added (see Table 2 and 6.13.4);
j) Through the normative reference to GB/T 24721.1-2023, the gasoline No., water
temperature requirements for general tests and test temperature requirements for
chemical media resistance are modified (see 6.2, 6.11 and 6.12; 5.2, 5.5.5 and 5.5.6
of Version 2009);
k) Special stipulations are modified (see 6.4.2; 5.4.2 of Version 2009);
l) Through the normative reference to GB/T 24721.1-2023, the requirements for
specimen thickness in the tensile strength test are added (see 6.7.2).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by and shall be under the jurisdiction of National Technical
Committee 223 on Traffic Engineering Facilities Highway of Standardization Administration
of China (SAC/TC 223).
The drafting organizations of this document: Research Institute of Highway Ministry of
Transport; China-Road Transportation Verification & Inspection Hi-Tech Co., Ltd.
The main drafters of this document: Zhang Zhiyong, Ma Xuefeng, Liu Yanfei, Chen Jianyou,
Wang Zhihua, Guo Donghua, Lu Yuhong, Xu Dong, Bai Yuanyuan, Zhou Haifeng, Han Yue,
Zhou Dai, Wu Xun, Gao Feng, Yang Ye, Qi Xiaoyu, Wei Zhengzhi, Liu Yang.
This document was firstly issued in 2009. This is the first revision.
Introduction
Glass fiber reinforced plastic materials for highway have been increasingly extensively applied
in the highway industry because of their suitable strength and favorable environmental
adaptability. GB/T 24721 Glass Fiber Reinforced Plastic Product for Highway divides the
standardization objects into two aspects: general and special. The general aspect of glass fiber
reinforced plastic materials for highway is taken as the first part of GB/T 24721, while the
special aspect of specific glass fiber reinforced plastic products for highway is taken as other
parts of GB/T 24721. GB/T 24721, which aims to standardize the quality management of this
type of materials, is composed of five parts.
---Part 1: General Rule. The purpose is to clarify the general technical requirements and
test methods for glass fiber reinforced plastic materials for highway.
---Part 2: Trunk. The purpose is to further standardize the quality level of glass fiber
reinforced plastic trunk products for highway.
---Part 3: Duct. The purpose is to further standardize the quality level of glass fiber
reinforced plastic duct products for highway.
---Part 4: Non-pressure Communications Well Lid. The purpose is to further standardize
the quality level of glass fiber reinforced plastic non-pressure communications well lid
products for highway.
---Part 5: Sign Base Panel. The purpose is to further standardize the quality level of glass
fiber reinforced plastic sign base panel products for highway.
At present, due to the different flame-retardant properties of glass fiber reinforced plastic trucks
for highway under different flame-retardant environmental conditions, with the extensive
application of UV and weather resistant glass fiber reinforced plastic products for highway, as
well as the application of the new type of high-strength glass fiber reinforced plastic materials
for highway to trunk products, it is necessary to revise and improve this document. In this
revision, the technical indicators comprehensively consider the overall level of domestic
production enterprises, and the content strives to satisfy the compilation principles of
applicability, advancement and operability, hoping to satisfy the requirements of product quality
control.
Glass Fiber Reinforced Plastic Product for Highway - Part
2: Trunk
1 Scope
This document specifies the product classification, structures, dimensions and deviations,
model, technical requirements, test methods, inspection rules, as well as marking, packaging,
transportation and storage requirements for glass fiber reinforced plastic trunk for highway.
This document is applicable to the production, inspection and usage of glass fiber reinforced
plastic trunk for highway (hereinafter referred to as “glass fiber reinforced trunk”).
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/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 Product Classification, Structures, Dimensions, Deviations
and Model
4.1 Classification
In addition to the classification in accordance with the stipulations of 4.1 in GB/T 24721.1-
2023, glass fiber reinforced trunks are also classified by material properties:
a) General trunks;
b) High-strength trunks.
4.2 Structures, Dimensions and Deviations
4.2.1 Structures and dimensions
NOTE: “” means no unit required.
a This indicator is only applicable to trunks used in closed and semi-closed environments, for example,
tunnels.
b This indicator is applicable to glass fiber reinforced trunks with external coating.
6 Test Methods
6.1 Specimen Conditioning and Test Environment Conditions
In accordance with the stipulations of 6.1 in GB/T 24721.1-2023, conduct the test.
6.2 Reagents
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
The specimens shall be taken from three sides of the formed trunk body and the trunk cover.
For the tensile strength and flexural strength tests, respectively take the same number of
specimens in the length and width direction of the trunk, and the minimum number of specimens
in each group for each property test shall be 5 PCS. For trunks with a height greater than or
equal to 150 mm, when sampling for the flexural strength test, take no less than 2 PCS from the
side, and for the flexural strength test during the type inspection, take no less than 8 groups of
40 PCS in the length and width direction.
6.5 Structures and Dimensions
6.5.1 Length
Use a steel tape with a division value of 1 mm to respectively measure-take three measurement
values along the axial direction on the three surfaces of the trunk body; take the arithmetic mean
as the measurement result.
6.5.2 Width
Use a steel ruler or steel tape with a division value of 1 mm to measure-take a total of six
measurement values at the upper, middle and lower parts on both sides of the trunk body; take
the arithmetic mean as the measurement result.
6.5.3 Height
Use a steel ruler or steel tape with a division value of 1 mm to randomly take three sections
along the length direction of the trunk body, measure-take three height measurement values;
take the arithmetic mean as the measurement result.
6.5.4 Wall thickness
Use a micrometer with a division value not greater than 0.01 mm to respectively measure-take
three measurement values on the three surfaces of the cover and trunk body; take the arithmetic
mean as the measurement result.
6.6 Appearance Quality
In accordance with the stipulations of 6.5 in GB/T 24721.1-2023, conduct the test.
6.7 General Physical and Mechanical Properties
6.7.1 Static friction coefficient of inner wall of trunk
In accordance with the method specified in Appendix B, conduct the test.
6.7.2 Other physical and mechanical properties
Tensile strength, compressive strength, flexural strength, impact strength, density, Barcol
hardness and load deformation temperature shall be tested in accordance with the stipulations
of 6.6 in GB/T 24721.1-2023.
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 Adhesion Performance
In accordance with the stipulations of 6.9 in GB/T 24721.1-2023, conduct the test.
6.11 Water Resistance
In accordance with the stipulations of 6.10 in GB/T 24721.1-2023, conduct the test.
6.12 Resistance to Chemical Media
In accordance with the stipulations of 6.11 in GB/T 24721.1-2023, conduct the test.
6.13 Environmental Adaptability
...