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GB/T 24721.3-2023 English PDF (GBT24721.3-2023)

GB/T 24721.3-2023 English PDF (GBT24721.3-2023)

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GB/T 24721.3-2023: Glass fiber reinforced plastic product for highway -- Part 3: Duct

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 duct for highway. This document is applicable to the production, inspection and usage of glass fiber reinforced plastic duct for highway (hereinafter referred to as ????glass fiber reinforced duct????).
GB/T 24721.3-2023
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 03.220.20; 93.080.30
CCS P 66
Replacing GB/T 24721.3-2009
Glass Fiber Reinforced Plastic Product for Highway - Part
3: Duct
ISSUED ON: MARCH 17, 2023
IMPLEMENTED ON: JULY 1, 2023
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE 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 ... 7 5 Technical Requirements ... 9
6 Test Methods ... 10
7 Inspection Rules ... 13
8 Marking, Packaging, Transportation and Storage ... 13
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 3 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 24721.3-2009 Glass Fiber Reinforced Plastic Product for Highway - Part 3: Duct. In comparison with GB/T 24721.3-2009, apart from structural adjustments and editorial modifications, the main technical changes are as follows: a) The classification of glass fiber reinforced ducts is modified (see 4.1; 3.1 of Version 2009);
b) The technical requirements for flame-retardant properties are modified (see Table 2; Table 2 of Version 2009);
c) Gasoline No., water temperature requirements for general tests and test temperature requirements for chemical media resistance are modified (see 6.2, 6.9 and 6.10; 5.2, 5.5.4 and 5.5.5 of Version 2009);
d) The test methods for flame-retardant properties are added (see 6.8). 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, Wang Zhihua, Lu Yuhong, Liu Yanfei, Guo Donghua, Bai Yuanyuan, Xu Dong, Zhou Dai, Han Yue, Zhou Haifeng, Wu Xun, Gao Feng, Cai Mengde, Wei Zhengzhi, Wang Jiangbei.
Glass Fiber Reinforced Plastic Product for Highway - Part
3: Duct
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 duct for highway. This document is applicable to the production, inspection and usage of glass fiber reinforced plastic duct for highway (hereinafter referred to as ?€?glass fiber reinforced duct?€?). 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 1458 Method for Mechanical Properties of Ring of Filament - Winding Reinforced Plastics
GB/T 5352 Fiber-reinforced Thermosetting Plastic Composites Pipe - Determination for External Loading Properties by Parallel-plate Loading
GB/T 14152 Thermoplastics Pipes - Determination of Resistance to External Blows - Round- the-clock Method
GB/T 24721.1-2023 Glass Fiber Reinforced Plastic Product for Highway - Part 1: General Rule GB/T 24721.2-2023 Glass Fiber Reinforced Plastic Product for Highway - Part 2: Trunk QB/T 2803 Determination of Deflection for Rigid Plastic Pipes
3 Terms and Definitions
This document does not have terms or definitions that need to be defined. measurement result.
6.5.2 Wall thickness
Use a micrometer with a division value not greater than 0.01 mm to respectively measure-take three measurement values at the socket end and the insertion end; take the arithmetic mean as the measurement result.
6.5.3 Inner diameter of socket end
Use a caliper with a division value not greater than 0.02 mm to measure-take three values at an interval of 120??? on the section of the duct socket end; take the arithmetic mean as the measurement result.
6.5.4 Length
Use a steel tape with a division value of 1 mm to respectively measure-take three values along the axial direction of the duct; take the arithmetic mean as the measurement result. 6.5.5 Deflection
In accordance with the stipulations of QB/T 2803, conduct the test.
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 Tensile strength
6.7.1.1 Rolled and pultruded glass fiber reinforced ducts shall be tested in accordance with the stipulations of 6.6.1 in GB/T 24721.1-2023.
6.7.1.2 Winded glass fiber reinforced ducts shall be tested in accordance with the stipulations of GB/T 1458.
6.7.2 Flexural strength
6.7.2.1 Rolled glass fiber reinforced ducts shall be tested in accordance with the stipulations of 6.6.3 in GB/T 24721.1-2023.
6.7.2.2 Winded glass fiber reinforced ducts shall be tested in accordance with the stipulations of GB/T 5352; the circumferential flexural strength shall be calculated in accordance with Formula (1):
Where,
???D---the circumferential flexural strength, expressed in (MPa);
P---the maximum compressive load, expressed in (N);
D0---the outer diameter of the duct, expressed in (mm);
L---the length of the specimen, expressed in (mm);
D---the inner diameter of the duct, expressed in (mm).
6.7.3 Density
In accordance with the stipulations of 6.6.5 in GB/T 24721.1-2023, conduct the test. 6.7.4 Barcol hardness
In accordance with the stipulations of 6.6.6 in GB/T 24721.1-2023, conduct the test. 6.7.5 Load deformation temperature
In accordance with the stipulations of 6.6.7 in GB/T 24721.1-2023, conduct the test. 6.7.6 Static friction coefficient of inner wall of duct
In accordance with the stipulations of Appendix B in GB/T 24721.2-2023, conduct the test. The length of the duct specimen is not less than 500 mm.
6.7.7 Duct rigidity
In accordance with the stipulations of GB/T 5352, conduct the test. The specimen length is 300 mm. When the radial change rate of the duct is 10% of the inner diameter, determine the duct rigidity.
6.7.8 Resistance to drop hammer impact
In accordance with the stipulations of GB/T 14152, conduct the test. The specimen length is 200 mm, and the test temperature is (20 ??? 2) ???C. Select Type D90 hammer, the hammer weight is 6.3 kg ??? 32 g, and the drop height is 1 m ??? 10 mm. For each specimen, impact once. 6.8 Flame-retardant Properties
In accordance with the stipulations of 6.7 in GB/T 24721.1-2023, conduct the test. 6.9 Water Resistance
In accordance with the stipulations of 6.10 in GB/T 24721.1-2023, conduct the test. 6.10 Resistance to Chemical Media

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