JT/T 646-2005 English PDF (JT/T646-2005)

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JT/T 646-2005: Specifications and examining methods for highway noise barriers materials
JT/T 646-2005
JT
ICS 03.220.20; ICS 13.020
R 04
Filing Number.
Transport Industry Standard
of the People’s Republic of China
Specifications and examining methods for
highway noise barriers materials
ISSUED ON. SEPTEMBER 21, 2005
IMPLEMENTED ON. JANUARY 1, 2006
Issued by. Ministry of Transport of the People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 5 
4 Classification ... 5 
5 Technical requirements ... 5 
6 Test methods ... 7 
Appendix A ... 8 
Foreword
Appendix A of this Standard is normative.
This Standard was proposed by Highway Research Institute of Ministry of Transport.
This Standard shall be under the jurisdiction of Science, Technology and Education
Division of Ministry of Transport.
Drafting organization of this Standard. Highway Research Institute of Ministry of
Transport.
The main drafters of this Standard. Wei Xianwei, Shen Yi, Yan Xiaolin, Ye Huihai,
Shang Xiaodong, Huang Shufang, and Wang Jian.
Specifications and examining methods for
highway noise barriers materials
1 Scope 
This Standard specifies the classification, technical requirements and test methods of
highway noise barriers materials.
This Standard applies to noise barriers materials to reduce traffic noise of various
grades of highways.
2 Normative references 
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB 8624 Classification for burning behavior of building materials and products
GB/T 18226 Highway Traffic engineering technical conditions of the steel
component anticorrosion
GB 50003 Code for design of masonry structures
GB 50010 Code for design of concrete structures
GBJ 17 Code for Design of Steel Structures
GBJ 47 Acoustics-sound-abserbin coefficient measurement by method of
reverbration room (Trial)
GBJ 75 Acoustics-measurement of sound insulation in buildings specifications
GBJ 129 Testing methods of basic mechanical performance of masonry
structures
Combustion property of plate-shaped acoustic materials shall meet the requirements
of Class B of GB 8624.
5.2.6 Appearance
According to the project design requirements, for the metal material’s surface that
needs color treatment, it may adopt polyester to perform powder coating. Coating
layer performance shall meet the requirements of GB/T 18226.
5.3 Structural Materials
5.3.1 Construction
5.3.1.1 Metal supporting materials shall meet the requirements of GBJ 17.
5.3.1.2 Concrete columns shall meet the requirements of GB 50010.
5.3.2 Anti-corrosion performance
Requirements to anti-corrosion performance of metal structural materials are the
same as 5.2.4.
5.3.3 Appearance
Appearance requirements are the same as 5.2.6.
6 Test methods 
6.1 Insulation index test shall be executed according to GBJ 75; noise reduction
coefficient test shall be executed according to GBJ 47.
6.2 Deflection test of plate-shaped acoustic materials shall be executed according to
Appendix A.
6.3 Strength performance test of block-shaped acoustic materials shall be executed
according to GBJ 129.
6.4 Anti-corrosion coating layer performance test shall be executed according to GB/T
18226.
6.5 Fireproof performance test shall be executed according to GB 8624.