GB/T 50046-2018 English PDF (GBT50046-2018)

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GB/T 50046-2018: Standard for anticorrosion design of industrial constructions
GB/T 50046-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB/T 50046-2018
Standard for anticorrosion design of industrial constructions
ISSUED ON: SEPTEMBER 11, 2018
IMPLEMENTED ON: MARCH 01, 2019
Issued by: Ministry of Housing and Urban-Rural Development of PRC.
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
Foreword ... 6
1 General provisions ... 10
2 Terms ... 11
3 Basic requirements ... 12
3.1 Corrosiveness classification ... 12
3.2 General layout and architectural layout ... 17
3.3 Design service life period of protective layer ... 18
4 Structures and members ... 19
4.1 General requirements ... 19
4.2 Concrete structures ... 19
4.3 Steel structures ... 22
4.4 Steel and concrete composite structure ... 24
4.5 Masonry structure ... 24
4.6 Timberwork ... 25
4.7 Ground work ... 25
4.8 Foundations ... 26
4.9 Pile ... 28
5 Building protection ... 33
5.1 Ground and floor ... 33
5.2 Structure and component surface protection ... 43
5.3 Doors and windows ... 46
5.4 Roof ... 47
5.5 Wall ... 47
6 Structures ... 49
6.1 Storage tank and sewage treatment pool ... 49
6.2 Outdoor pipe rack ... 52
6.3 Exhaust funnel ... 52
7 Materials ... 55
7.1 General requirements ... 55
7.2 Cement mortar and concrete ... 55
7.3 Bulk of corrosion resistance ... 56
7.4 Metal ... 57
7.5 Plastic material ... 57
7.6 Wood ... 58
7.7 Resin materials ... 58
7.8 Water glass materials ... 58
7.9 Asphalt materials ... 59
7.10 Anticorrosion coatings ... 59
Appendix A Corrosion resistance properties of commonly used materials ... 61
Appendix B Physical and mechanical properties of commonly used materials
... 65
Appendix C Commonly used coating protection systems ... 67
Appendix D Testing methods for linear shrinkage of resin mortar and resin
concrete ... 75
Explanation of wording in this standard ... 78
List of quoted standards ... 79
Standard for anticorrosion design of industrial
constructions
1 General provisions
1.0.1 This standard is formulated with a view to ensuring that buildings and structures subjected
corrosive medium are used normally within the design service life.
1.0.2 This standard is applicable to anticorrosion design for buildings and structures subjected to
corrosive medium.
1.0.3 Anticorrosion design of industrial constructions shall follow the principle of combining
prevention with protection. According to the corrosiveness, environmental conditions, production
operation management level and construction and maintenance conditions of the medium
produced during the production process, the anticorrosion measures shall be taken in the light of
local conditions; protection and prevention shall be strengthened for parts that endanger personal
safety and are difficult to be maintained, as well as important load-bearing structures and
members.
1.0.4 In addition to the requirements of this standard, the anticorrosion design of industrial
constructions shall also meet the requirements of the current relevant standards of the nation.
4 Structures and members
4.1 General requirements
4.1.1 Under corrosive environment, the structural design shall meet the following requirements:
1 The structural materials shall be properly selected according to the adaptability of materials to
different mediums;
2 The structural type, arrangement and configuration shall be selected in a way that is beneficial
to improve the corrosion resistance of the structure, effectively avoid the accumulation of
corrosive mediums on the surface of the member and remove in time if any, and facilitate the
arrangement and maintenance of the protective layer;
3 The design service life of the structural members shall be determined according to the relevant
requirements of the current national standard GB 50068 Unified standard for reliability design of
building structures.
4 When the design service life of certain secondary members is different from that of major
structure, the secondary members shall be easily replaceable.
4.2 Concrete structures
4.2.1 The concrete structure and members shall be selected according to the following
requirements:
1 The frame should be placed in situ;
2 In case of corrosiveness class A (strongly corrosive), prestressed concrete structure should be
adopted for the roof truss, the roof girder and the crane beam with a working level equal to or
greater than A4;
3 In case of corrosiveness classes A and B, the column section should be of solid-web type,
rather than in an H shape with opening in the web.
4.2.2 The design of prestressed concrete structure shall meet the following requirements:
1 In case of corrosiveness classes A and B, pre-tensioned prestressed concrete structure should
be adopted; if unbonded prestressed concrete structure is adopted, the anchoring system shall be a
continuous fully-enclosed anti-corrosion system or the channels shall be grouted. The durability of
the corrosion-resistant materials shall conform to the requirements of the environment type and
design service life of the external tendon.
beam.
4.2.9 For the protection of exposed steel embedded parts and connecting parts in the concrete
structures, the following measures shall be taken according to the following requirements based on
the corrosiveness class, importance and ease of inspection and maintenance:
1 Encasing with resin or polymer-cement concrete, where the thickness of concrete
should be 30mm~50mm;
2 Mortar plastering with resin or polymer cement, where the thickness of the mortar should be
10mm~20mm;
3 Resin-bonded glass flake mastic protection, where the thickness of the mastic should be
1mm~2mm;
4 Anti-corrosion coating protection, where the thickness of the coating should be
200μm~320μm;
5 The parts may be made of corrosion-resistant metals.
4.2.10 The exposed pre-tensioned tendons shall be enclosed with resin or polymer-cement
concrete, and the thickness of the protective layer shall not be less than 50 mm. The anchored end
of the post-tensioned prestressed concrete, if exposed in arrangement, shall be encased with resin
or polymer-cement concrete. The thickness of the protective layer shall not be less than 50 mm,
and the anchored end shall be protected against corrosive medium and accumulation of water.
4.3 Steel structures
4.3.1 In case of corrosiveness class A, lattice structure should not be adopted for the important
carrying members such as the truss, columns and main beams; cold-formed thin-walled steel shall
not be used.
4.3.2 Important members and those difficult to maintain shall not be made of steel with original
surface corrosiveness class of Grade D. Protective coating with long service life or more should be
adopted
4.3.3 The cross-section of steel structural members shall be selected according to the following
requirements:
1 The members shall adopted solid web type or closed section where the section end shall be
enclosed; for hot-dip galvanizing of closed-section bars, holes shall be opened to avoid explosion;
2 Double-angle steel formed T-shaped section or double-channel steel formed H-shaped section
should not be adopted in case of corrosiveness classes A and B;
3 If members made by assembling section steels, the width of gap between the section steels
shall meet the requirements of construction and maintenance of the protective layer,...