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According to the requirements of Document JIANBIAO [2013] No.169 Notification of Notice on Printing Development and Revision Plan of National Engineering Construction Standards and Codes in 2014 issued by the Ministry of Housing and Urban-Rural Development, this standard is jointly developed by the Branch of Chemical Engineering, China Association for Engineering Construction Standardization, China Huanqiu Contracting & Engineering Co., Ltd. and relevant participating development organizations.
During the revision of this standard, the drafting group conducted extensive investigations, carried out monographic discussions and experimental research, summarized the practical experience of anticorrosion designs of industrial constructions in China in recent years, coordinated with relevant specifications in China, and referenced relevant international standards. This standard has been reviewed and finalized on the basis of extensive solicitation of opinions.
This standard consists of 7 clauses and 4 annexes, with the main technical contents covering general provisions, terms, basic requirements, structures and members, building protection, structures, and materials.
The main changes in this revision include:
1 The corrosiveness class of the gaseous medium is partially revised; the corrosiveness class of the gaseous medium to the steel and the corrosiveness class of the marine atmosphere are added when the mass loss and thickness loss per unit are used as the corrosion conditions.
2 Design requirements for service life of protective layer are added.
3 Technical content and requirements for the durability of concrete structures are added
4 The mandatory provisions are modified as non-compulsory provisions.
5 Conditions for the use of the pile foundation under corrosive environment are adjusted.
6 Technical requirements for the integral surface layer of vinyl ester resin mortar and the integral storage tank of resin fine aggregate concrete are added.
7 Chemical properties of corrosive medium and anticorrosion system are enriched.
8 Testing methods for linear shrinkage of resin mortar and resin concrete are added.
The Ministry of Housing and Urban-Rural Development of the People’s Republic of China is in charge of the administration of this standard; the Branch of Chemical Engineering, China Association for Engineering Construction Standardization is responsible for the routine management; China Huanqiu Contracting & Engineering Co., Ltd. is responsible for the explanation of specific technical contents. During the process of implementing this standard, all relevant organizations are kindly requested to sum up experience and accumulate information carefully in combination with engineering practice, and feed the opinions and suggestions back to China Huanqiu Contracting & Engineering Co., Ltd. (address: No.1, Chuangda 2nd Road, Laiguangying High-tech Industrial Park, Chaoyang District, Beijing, 100012, China) for future reference in revision.
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.
2 Terms
2.0.1 corrosiveness classification
under the long-term action of corrosive medium, according to the degree of deterioration of building materials, namely appearance change, weight change, strength loss and corrosion rate, the corrosive grade is comprehensively evaluated and divided into: strongly corrosive (A), moderately corrosive (B), weakly corrosive (C) and slightly corrosive (D)
2.0.2 service life of protective layer
under the conditions of reasonable design, correct construction and normal use and maintenance, the service life of anticorrosion ground, coating and other protective layers
2.0.3 resin-bonded glass flake mastic
a kind of mixed material prepared by mixing curing agent, glass flake and various additives and fillers with resin as binder, which can be used for spatulation
2.0.4 dense type water glass bonded materials
materials such as sodium silicate acid-resistant cement, sodium silicate acid-resistant mortar and sodium silicate acid-resistant concrete with impermeability grade greater than or equal to 1.2 MPa
2.0.5 resin fine aggregate concrete
fine stone concrete prepared by mixing curing agent and acid-resistant aggregate using resin as binder
2.0.6 resistance class to sulphate attack of concrete KS
resistance class of concrete to sulfate attack divided by the maximum number of wet-dry cycles measured with test method for resistance to sulfate attack
2.0.7 dense concrete
fine stone concrete with impermeability grade greater than P8
3 Basic requirements
3.1 Corrosiveness classification
3.1.1 Corrosive medium can be divided into gaseous medium, liquid medium and solid medium according to its existence form. All kinds of medium shall be classified according to their nature, content and environmental conditions. The corrosive medium category of the production part shall be determined in accordance with the production conditions.
3.1.2 The corrosiveness of medium to building materials under long-term action may be classified into four classes: strongly corrosive (A), moderately corrosive (B), weakly corrosive (C) and slightly corrosive (D); if multiple media of the same form act simultaneously on the same part, the highest corrosiveness class shall be; if the same medium is classified into different corrosiveness classes by different methods, the highest one shall be taken.
3.1.3 The relative humidity of the environment shall be the actual relative humidity of the part where the component is placed; if the production condition has little effect on the relative humidity of the environment, the annual average relative humidity of the area where the project is located may be used; for the part that is often in a wet state or inevitably dewy, the relative humidity of the environment shall be greater than 75%.
3.1.4 At normal temperature, the corrosiveness class of gaseous medium to building materials can be determined according to the medium concentration and ambient humidity in accordance with Table 3.1.4.
Table 3.1.4 Corrosiveness class of gaseous medium to building materials
Medium type Medium name Corrosive medium concentration (mg/m3) Relative ambient humidity (%) Rebar in the reinforced concrete and pre-stressed concrete Cement mortar and plain concrete Steel Fired brick masonry Wood Al
Q1 Chlorine 1.0~5.0 >75 A C A C C A
60~75 B C B C D B
<60 C D B D D B
Q2 0.1~1.0 >75 B D B D D B
60~75 C D B D D B
<60 D D C D D C
03 Hydrogen chloride 1.0~10.0 >75 A B A B C A
60~75 A C A C C A
<60 B D B D D B
Q4 0.05~1.00 >75 B C A C C A
60~75 B C B D D B
<60 C D C D D C
Q5 Nitrogen oxides 5.0~25.0 >75 A B A B B C
60~75 B C B C C C
<60 C D B D D D
Q6 0.1~5.0 >75 B C B C C C
60~75 C D B D D D
<60 D D C D D D
Q7 Hydrogen sulfide 5.0~100.0 >75 A C A C C C
60~75 B D B D D C
<60 C D B D D D
Q8 0.01~5.00 >75 B D B D C C
60~75 C D B D D D
<60 D D C D D D
Q9 Hydrogen fluoride 1.0~10.0 >75 B C A D C B
60~75 C D B D D B
<60 D D B D D C
Q10 Sulfur dioxide 10.0~200.0 >75 A C A C C A
60~75 B C B C D B
<60 C D B D D C
Q11 0.5~10.0 >75 B D B D D B
60~75 C D B D D C
<60 D D C D D C
Q12 Sulfuric acid mist Frequently act >75 A A A B B A
Q13 Occasionally act >75 B B A C C B
≤75 C C B C C C
Q14 Acetic acid mist Frequently act >75 A B A B C C
Q15 Occasionally act >75 B C A C D D
≤75 C C B D D D
Q16 Carbon dioxide >2000.0 >75 B D B D D C
60~75 C D C D D D
<60 D D C D D D
Q17 Ammonia >20.0 >75 C D B D C C
60~75 C D B D D D
<60 D D C D D D
Q18 Alkali mist Occasionally act — C C C B B B
Note: Plain concrete is cement concrete without any admixture.
3.1.5 At normal temperature, the corrosiveness class of liquid medium to building materials shall be determined in accordance with Table 3.1.5.
Table 3.1.5 Corrosiveness class of liquid medium to building materials
Medium type Medium name pH value
or concentration Reinforced concrete and prestressed concrete Cement mortar and plain concrete Fired brick masonry
Y1 Inorganic acid Sulfuric acid, hydrochloric acid, nitric acid, chromic acid, phosphoric acid, various acid pickling solution, plating solution, electrolyte and acidic water (pH value) <4.0 A A A
Y2 4.0~5.0 B B B
Y3 5.0~6.5 C C C
Y4 Hydrofluoric acid (%) ≥2 A A A
Y5 Organic acid Acetic acid and citric acid (%) ≥2 A A A
Y6 Lactic acid, C5~C20 fatty acid (%) ≥2 B B B
Y7 Alkali Sodium hydroxide (%) >15 B B A
Y8 8~15 C C A
Y9 Ammonia water (%) ≥10 C D C
Y10 Salt Carbonate and bicarbonate of Na, K, and NH4+ (%) ≥2 C C B
Y11 Sulfate of Na, K, NH4+, Mg, Cu, Cd and Fe (%) ≥1 A A A
Y12 Sulfite and nitrite of Na and K (%) ≥1 B B B
Y13 Ammonium nitrate (%) ≥1 A A A
Y14 Nitrate of Na and K (%) ≥2 C C B
Y15 Chloride of NH4+ Al and Fe (%) ≥1 A A A
Y16 Chloride of Ca Mg K and Na (%) ≥2 A C B
Y17 Urea (%) ≥10 B B B
Notes:
1 The concentration in the table refers to mass percent, %;
2 If the liquid medium is classified by ion concentration, the corrosiveness class shall be determined in accordance with the relevant requirements of the current national standard GB 50021 Code for investigation of geotechnical engineering.
3.1.6 At normal temperature, the corrosiveness class of solid medium (including aerosol) to building materials shall be determined according to Table 3.1.6; if the solid medium may be dissolved or easily dissolved in salt to act on the outdoor components, the corrosiveness class shall be determined in accordance with 3.1.5 of this standard.
1 General provisions
2 Terms
3 Basic requirements
3.1 Corrosiveness classification
3.2 General layout and architectural layout
3.3 Design service life period of protective layer
4 Structures and members
4.1 General requirements
4.2 Concrete structures
4.3 Steel structures
4.4 Steel and concrete composite structure
4.5 Masonry structure
4.6 Timberwork
4.7 Ground work
4.8 Foundations
4.9 Pile
5 Building protection
5.1 Ground and floor
5.2 Structure and component surface protection
5.3 Doors and windows
5.4 Roof
5.5 Wall
6 Structures
6.1 Storage tank and sewage treatment pool
6.2 Outdoor pipe rack
6.3 Exhaust funnel
7 Materials
7.1 General requirements
7.2 Cement mortar and concrete
7.3 Bulk of corrosion resistance
7.4 Metal
7.5 Plastic material
7.6 Wood
7.7 Resin materials
7.8 Water glass materials
7.9 Asphalt materials
7.10 Anticorrosion coatings
