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According to the requirements of Guangdong Provincial Department of Construction's Notice on Compilation Task of Guangdong Local Standard Technical code for indoor environmental pollution control of civil building engineering (YUEJIANKEHAN [2007] No. 333), the compilation team conducted a special study on the relevant detection methods based on the investigation of a large number of standards and research results at home and abroad, and combined with the specific situation of Guangdong Province, and put forward an exposure draft. After soliciting opinions all over the country, and repeated revisions, the Guangdong Provincial Standard Technical code for indoor environmental pollution control of civil building engineering is formulated.
This code is divided into seven clauses, i.e. general provisions, terms, materials, survey and design for building engineering, engineering construction, acceptance, quality assurance and quality control, and six annexes of relevant detection methods. Emphasis is placed on the admission detection of pollutants in building materials and decoration materials, attention is paid to the control of pollutants in engineering investigation, design and construction process, and priority is given to the final engineering acceptance. Specific technical requirements are put forward for air quality control in the whole building construction process.
Mandatory provisions in this standard are basically consistent with those in GB 50325-2010 Code for indoor environmental pollution control of civil building engineering.
The provisions hereof printed in bold type are compulsory provisions and must be enforced strictly.
Guangdong Provincial Department of Housing and Urban-Rural Development is in charge of the administration of this code, and Guangzhou City Architectural Research Institute is responsible for the explanation of specific technical contents.
Technical code for indoor environmental pollution control of civil building engineering
1 General provisions
1.0.1 This code is formulated with a view to preventing and controlling indoor environmental pollution caused by building materials and decoration materials in civil building engineering, protecting public health, safeguarding public interests, and achieving advanced technology, economy and rationality, in combination with the actual situation of Guangdong Province.
1.0.2 This code is applicable to indoor environmental pollution control for new construction, extension and renovation of civil buildings, and not applicable to indoor environmental pollution control for industrial building engineering, warehouse building engineering or structures, and rooms with special purification or sanitation requirements.
Notes:
1 Indoor environmental pollution hereof refers to indoor environmental pollution caused by building materials and decoration materials. After the civil building engineering is delivered for use, indoor environmental pollution caused by non-building decoration materials is not within the control range of this code.
2 Indoor air pollutant content detection in industrial buildings or other buildings may refer to this code.
1.0.3 Indoor environmental pollutants controlled in this code are radon (Rn-222), formaldehyde, ammonia, benzene and total volatile organic compounds (TVOC).
1.0.4 Civil building engineering are divided into the following two categories according to different requirements for controlling indoor environmental pollution:
1 Class I civil building engineering: residential buildings, hospitals, buildings for the aged, kindergartens, school classrooms and other civil building engineering;
2 Class II civil building engineering: office buildings, shops, hotels, cultural and entertainment places, bookstores, libraries, exhibition halls, gymnasiums, waiting rooms for public transportation, restaurants, barbershops and other civil building engineering as well as office places in industrial buildings.
1.0.5 The main building materials and decoration materials used in civil building engineering must meet the requirements hereof.
1.0.6 In addition to the requirements specified hereof, the indoor environmental pollution control of civil building engineering shall also meet the relevant national and professional current standards.
2 Terms
2.0.1
civil building engineering
general term of constructed, extended and renovated civil building structure engineering and decoration engineering
2.0.2
environmental test chamber
equipment for testing pollutant emission of building materials and decoration materials by simulating indoor environment
2.0.3
radon exhalation rate from soil surface
radioactivity (mBq) of radon released from the surface of soil or material per unit area (m2) at per unit time (s), mBq/(m2·s)
2.0.4
internal exposure index
quotient (IRa) of specific activity of natural radionuclide radium-226 in building materials divided by the limited value of specific activity 200
2.0.5
external exposure index
sum of quotients (Ir) of specific activities of natural radionuclides radium-226, thorium-232 and potassium-40 in building materials divided by their limits respectively
(2.0.5)
where,
CRa, CTh and CK——the specific activities of natural radionuclides radium-226, thorium-232 and potassium-40 in building materials respectively, Bq/kg.
2.0.6
radon concentration
radioactivity of radon in air per unit volume
2.0.7
wood-based panels
panels of which the raw material is plant fiber which is separated into unit materials of various shapes by mechanical processing, and then combined and pressed with adhesive, including plywood, fiberboard, particleboard, etc.
2.0.8
decorated wood-based panels
plate of which the artificial wood panel is used as the base, finished or of which the surface layer is compounded with decorative materials
2.0.9
water-based coatings
coatings with water as diluent
2.0.10
water-based adhesives
adhesives with water as diluent
2.0.11
water-based treatment agents
liquid with water as diluent, which can be immersed in building materials and decoration materials to improve their flame retardant, waterproof and anticorrosion and other properties
2.0.12
solvent-thinned coatings
coatings with organic solvents as diluent
2.0.13
solvent-thinned adhesives
adhesives with organic solvents as diluent
2.0.14
content of released formaldehyde
amount of free formaldehyde released by materials by environmental test chamber method or dryer method
2.0.15
content of free formaldehyde
amount of free formaldehyde in unit mass of material by perforation method
2.0.16
total volatile organic compounds
total amount of volatile organic compounds in the air determined under the conditions specified hereof, referred to as TVOC
2.0.17
volatile organic compound
total amount of volatile organic compounds in the material determined under the conditions specified hereof, referred to as VOC
2.0.18
infiltration rate
percentage of indoor air volume from outdoor to indoor air volume in the room within one hour, %
3 Materials
3.1 Inorganic non-metallic main building materials and decoration materials
3.1.1 The radioactive indicator limit of inorganic non-metallic building materials such as sand, stone, cement, brick, block, fly ash as well as concrete and concrete prefabricated components used in civil building engineering shall meet the requirements of Table 3.1.1.
Table 3.1.1 Radioactivity limits for inorganic non-metallic building materials
Determination item Limit
Internal exposure index (IRa) ≤1.0
External exposure index (Ir) ≤1.0
3.1.2 When classifying inorganic non-metallic decorative materials used in civil building engineering, including stone materials, building sanitary ceramics, gypsum board, ceiling materials, inorganic ceramic tile adhesive materials, etc., the radioactivity limit shall meet those specified in Table 3.1.2.
Table 3.1.2 Radioactivity limit of inorganic non-metallic building decorative materials
Measuring item Limit
A B
Internal exposure index (IRa) ≤1.0 ≤1.3
External exposure index (Ir) ≤1.3 ≤1.9
3.1.3 The use range of Class A decorative materials is not limited; Class B materials can't be used for the interior decoration of Class I civil buildings, but can be used for the interior decoration of Class II civil buildings, industrial buildings and the exterior decoration of all other buildings.
3.1.4 The radioactivity limit of aerated concrete and building materials such as hollow bricks and hollow blocks with hollow ratio (void ratio) greater than 25% used in civil building engineering shall meet those specified in Table 3.1.4.
Table 3.1.4 Radioactivity limit of aerated concrete and building materials with hollow ratio (void ratio) greater than 25%
Determination item Limit
Radon exhalation rate from soil surface [mBq/(m2s)] ≤15
Internal exposure index (IRa) ≤1.0
External exposure index (Ir) ≤1.3
3.1.5 The detection method of radionuclide in main materials and decorative materials of building shall meet the relevant requirements of the current national standard GB 6566 Limits of radionuclides in building materials. The detection method of radon exhalation rate from soil surface shall meet the relevant requirements of the current national standard GB/T 16143 Charcoal canister method for measuring 222Rn exhalation rate from building surface or the Annex A of GB 50325-2010 Code for indoor environmental pollution control of civil building engineering.
3.2 Wood-based panels and decorated wood-based panels
3.2.1 The content of free formaldehyde or released formaldehyde must be determined for indoor wood-based panels and decorated wood-based panels in civil building engineering.
3.2.2 When the content of released formaldehyde is measured by the environmental test chamber method, and the wood-based panels are classified accordingly, the limit shall meet those specified in Table 3.2.2.
Table 3.2.2 Determination of content limit of released formaldehyde using environmental test chamber method
Level Limit (mg/m3)
E1 ≤0.12
3.2.3 When the content of free formaldehyde is determined by the perforation method and the wood-based panels are graded accordingly, the limit shall meet the relevant requirements of the current national standard GB 18580 Indoor decorating and refurbishing materials - Limit of formaldehyde emission of wood-based panels and finishing products.
3.2.4 When the content of released formaldehyde is determined by the dryer method, and the wood-based panels are graded accordingly, the limit shall meet the relevant requirements of the current national standard GB 18580 Indoor decorating and refurbishing materials - Limit of formaldehyde emission of wood-based panels and finishing products.
3.2.5 The content of released formaldehyde of decorated wood-based panels may be determined by the environmental test chamber method or dryer method. In case of any dispute, the determination result of the environmental test chamber method shall prevail; the content of released formaldehyde of ply-wood and blockboard should be determined by the dryer method; the particleboard, fiberboard should be determined by the perforation method.
3.2.6 When determining the content of released formaldehyde by using environmental test chamber method, the determination should be carried out according to Annex A hereof.
3.2.7 When perforation method and dryer method are used for detection, they shall meet the relevant requirements of the current national standard GB 18580 Indoor decorating and refurbishing materials - Limit of formaldehyde emission of wood-based panels and finishing products. When dryer method is used for detection, the four sides of the sample shall be sealed with formaldehyde-free aluminum tape.
3.3 Coating
3.3.1 For indoor water-based coatings and water-based putty in civil building engineering, the content of free formaldehyde shall be determined, and its limit shall meet those specified in Table 3.3.1.
Table 3.3.1 Limit of free formaldehyde in indoor water-based coatings and water-based putty
Determination item Limit
Free formaldehyde (mg/kg) ≤100
3.3.2 The indoor solvent-thinned coatings and solvent-thinned putty for woodenware in civil building engineering shall be mixed according to the specified maximum dilution ratio, and then the contents of VOC and benzene, methylbenzene + dimethylbenzene + ethylbenzene shall be determined, and their limits shall meet those specified in Table 3.3.2.
Table 3.3.2 Limits of VOC and benzene, methylbenzene + dimethylbenzene + ethylbenzene in indoor solvent-thinned coatings and solvent-thinned putty for woodenware
Name of coating VOC (g/L) Benzene (%) Methylbenzene + dimethylbenzene + ethylbenzene (%)
Alkyd coatings ≤500 ≤0.3 ≤5
Nitrocellulose coatings ≤720 ≤0.3 ≤30
Polyurethane coatings ≤670 ≤0.3 ≤30
Phenolic anti-rust paint ≤270 ≤0.3 -
Other solvent-thinned coatings ≤600 ≤0.3 ≤30
Solvent-thinned putty for woodenware ≤550 ≤0.3 ≤30
3.3.3 For polyurethane paint, after determining the content of free diisocyanate (TDI, HDI) in curing agent, the content of free diisocyanate (TDI, HDI) in polyurethane paint shall be calculated according to the specified minimum dilution ratio, and shall not exceed 4g/kg. The determination method should meet the relevant requirements of the current national standard GB/T 18446 Binders for paints and varnishes - Determination of monomeric diisocyanates in isocyanate resins.
3.3.4 The determination method of free formaldehyde content in water-based coatings and water-based putty should meet the relevant requirements of the current national standard GB 18582 Indoor decorating and refurbishing materials - Limit of harmful substances of interior architectural coatings.
3.3.5 The determination method of VOC and benzene, methylbenzene + dimethylbenzene + ethylbenzene in solvent-thinned coatings should be carried out according to Annex B hereof.
3.4 Adhesive
3.4.1 The content of volatile organic compounds (VOC) and free formaldehyde in indoor water-based adhesives for civil building engineering shall be determined, and the limits shall meet those specified in Table 3.4.1.
Table 3.4.1 Limits of volatile organic compounds (VOC) and free formaldehyde in indoor water-based adhesive
Determination item Limit
Polyvinyl acetate adhesive Rubber adhesive Polyurethane adhesive Other adhesives
Volatile organic compounds (VOC)/(g/L) ≤110 ≤250 ≤100 ≤350
Free formaldehyde/(g/kg) ≤1.0 ≤1.0 — ≤1.0
3.4.2 The content of volatile organic compounds (VOC), benzene, methylbenzene + dimethylbenzene in indoor solvent-thinned adhesives in civil building engineering shall be determined, and the limit shall meet those specified in Table 3.4.2.
Table 3.4.2 Limits of VOC, benzene, methylbenzene + dimethylbenzene + ethylbenzene in indoor solvent-thinned adhesives
Item Limit
Neoprene adhesive SBS adhesive Polyurethane adhesive Other adhesives
Benzene /(g/kg) ≤5.0
Methylbenzene + dimethylbenzene /(g/kg) ≤200 ≤150 ≤150 ≤150
Volatile organic compounds /(g/L) ≤700 ≤650 ≤700 ≤700
3.4.3 The content of free toluene diisocyanate (TDI) in polyurethane adhesive shall be determined, which shall not be greater than 4g/kg according to the recommended minimum dilution of the product. The determination method should meet the requirements of Annex D in national standard GB 18583-2008 Indoor decorating and refurbishing materials - Limit of harmful substances of adhesives.
3.4.4 The determination method of the content of free formaldehyde and volatile organic compounds (VOC) in water-based adhesives should meet the requirements of Annex A and Annex F in GB 18583-2008 Indoor decorating and refurbishing materials - Limit of harmful substances of adhesives.
3.4.5 The determination method of the content of volatile organic compound (VOC), benzene and methylbenzene + dimethylbenzene in solvent-thinned adhesives should meet the requirements of Annex B.
3.5 Water-based treatment agent
3.5.1 For indoor water-based treatment agents such as water-based fire retardant (including fireproof coating), waterproof agent and preservative of civil building engineering, the content of free formaldehyde shall be determined and its limit shall meet those specified in Table 3.5.1.
Table 3.5.1 Limit of free formaldehyde in indoor water-based treatment agent
Determination item Limit
Free formaldehyde/(mg/kg) ≤100
3.5.2 The determination method of content of free formaldehyde in water-based treatment agent should be carried out according to the method specified in current national standard GB 18582 Indoor decorating and refurbishing materials - Limit of harmful substances of interior architectural coatings.
3.6 Other materials
3.6.1 For flame retardants and concrete admixtures that can release ammonia used in civil building engineering, the content of released ammonia shall not be greater than 0.10%, and the determination method shall meet the requirements of the current national standard GB 18588 Limit of ammonia emitted from the concrete admixtures.
3.6.2 For concrete admixtures that can release formaldehyde, the content of free formaldehyde shall not be greater than 500mg/kg, and the determination method shall meet the requirements of the current national standard GB 18582 Indoor decorating and refurbishing materials - Limit of harmful substances of interior architectural coatings.
3.6.3 For bonded timber structure materials used in civil building engineering, the content of released formaldehyde shall not be greater than 0.12mg/m3, and the determination method shall meet the requirements of Annex A.
3.6.4 During the interior decoration of civil building engineering, the content of released formaldehyde of wall cloth, curtain, etc. shall not be greater than 0.12mg/m3, and the determination method shall meet the requirements of Annex A.
3.6.5 The formaldehyde content in indoor wallpaper of civil building engineering shall not be greater than 120mg/kg, and the determination method shall meet the requirements of current national standard GB 18585 Indoor decorating and refurbishing materials - Limit of harmful substances of wallpapers.
3.6.6 The determination method of volatile matter content in indoor PVC floor sheets of civil building engineering shall meet the requirements of current national standard GB 18586 Indoor decorating and refurbishing materials - Limit of harmful substances of polyvinyl chloride floor coverings, and the limits shall meet those specified in Table 3.6.6.
Table 3.6.6 Limit of volatiles in polyvinyl chloride floor coverings
Name Limit/(g/m2)
Foamed floor coverings Glass fiber substrate ≤75
Other substrates ≤35
Non-foamed floor coverings Glass fiber substrate ≤40
Other substrates ≤10
3.6.7 The method for determining the release of total volatile organic compounds and content of released formaldehyde from indoor carpets and carpet underlay for civil building engineering shall meet the requirements of Annex A hereof, and the limits shall meet those specified in Table 3.6.7.
Table 3.6.7 Release limits of hazardous substances in carpets and carpet underlay
Name Item of hazardous substances Limit mg/(m2·h)
Class A Class B
Carpet Total volatile organic compounds ≤0.500 ≤0.600
Free formaldehyde ≤0.050 ≤0.050
Carpet underlay Total volatile organic compounds ≤1.000 ≤1.200
Free formaldehyde ≤0.050 ≤0.050
4 Survey and design for building engineering
4.1 General requirement
4.1.1 Before the design of a new or expanded civil building engineering, an investigation shall be carried out on the radon concentration in the soil or the radon exhalation rate from soil surface in the urban area where the building engineering is located, and the corresponding investigation report shall be submitted. If not been measured, the radon concentration in the soil or the radon exhalation rate from soil surface shall be measured, and the corresponding detection report shall be provided.
4.1.2 For civil building engineering design, the usage of decoration materials shall be controlled according to the type and purpose of the building.
4.1.3 The indoor ventilation design of civil building engineering shall meet the relevant requirements of the national current standard GB 50352 General principles for design of civil buildings. For civil building engineering with central air conditioning, the fresh air volume shall meet the relevant requirements of the current national standard GB 50189 Design standard for energy efficiency of public buildings.
4.1.4 For civil building engineering with natural ventilation, the effective ventilation opening area of a single room shall not be less than 1/20 of floor area of the room.
4.2 Radon concentration detection and resistant measures on engineering sites
4.2.1 The engineering geological survey data of newly-built and expanded civil building engineering shall include the historical data of soil radon concentration or radon exhalation rate in the urban area where the engineering is located, and the average data of soil radon concentration or radon exhalation rate.
.
4.2.2 For civil building engineering for which regional determination of radon concentration in soil or radon exhalation rate from soil surface has been carried out, when the average value of soil radon concentration is not more than 10,000Bq/m3 or the radon exhalation rate from soil surface is not more than 20mBq/(m2·s), and when there is no geological fracture structure at the construction site, the determination of soil radon concentration can no longer be carried out; otherwise, determination shall be carried out.
4.2.3 When the radon concentration in the soil of civil building engineering site is not more than 20,000Bq/m3 or the average value of radon exhalation rate from soil surface is not more than 50mBq/(m2·s), the anti-radon engineering measures may be omitted.
4.2.4 When the determination results of soil radon concentration in civil building engineering sites are more than 20,000Bq/m3 and less than 30,000Bq/m3, or the radon exhalation rate from oil surface is greater than 50mBq/(m2·s) and less than 100mBq/(m2·s), anti-cracking measures shall be taken on the ground floor of the building.
4.2.5 When the determination results of soil radon concentration in civil building engineering sites are greater than or equal to 30,000Bq/m3 and less than 50,000Bq/m3, or the radon exhalation rate from soil surface is greater than or equal to 100mBq/(m2 s) and less than 300mBq/ (m2 s), in addition to taking anti-cracking measures on the ground floor of the building, the foundation must also be treated in accordance with the first-class waterproofing requirements of the current national standard GB 50108 Technical code for waterproofing of underground work.
4.2.6 When the determination results of soil radon concentration in civil building engineering sites are greater than or equal to 50,000Bq/m3, or the radon exhalation rate is greater than or equal to 300mBq/(m2·s), comprehensive anti-radon building structural measures shall be taken.
4.2.7 When the radon concentration in the soil of Class I civil building engineering site is greater than or equal to 50,000Bq/m3, or the radon exhalation rate from soil surface is greater than or equal to 300mBq/(m2·s), the specific activities of radium-266, thorium-232 and potassium-40 in the soil of construction site shall be determined. Each site shall take a soil sample evenly for every 1,000m2 (areas less than 1,000m2 shall be counted as 1,000m2) for radioactivity detection. When the detection results show that the internal exposure index (IRa) is greater than 1.0 or the external exposure index (Ir) is greater than 1.3, the soil of the construction site shall not be used as the backfill.
4.2.8 The average radon concentration in soil shall be evaluated separately according to the radon concentration in basement space which is independent but connected.
4.2.9 The determination of radon concentration in soil and radon exhalation rate from soil surface in civil building engineering site shall be carried out in accordance with Annex C hereof.
4.3 Choice of materials
4.3.1 For indoor civil building engineering, building materials prohibited or restricted by the state shall not be used.
The inorganic non-metallic decoration materials used in the indoor decoration of Class I civil building engineering must be Class A.
4.3.2 The inorganic non-metallic decoration materials used in the indoor decoration of Class II civil building engineering should be Class A. When Class A and Class B inorganic non-metallic decoration materials are used together, the amount of each material shall be determined using the following equations:
(4.3.2-1)
(4.3.2-2)
where,
fi——the mass percentage of the ith material in the total amount of material, %;
IRai——the internal exposure index of the ith material;
Iri——the external exposure index of the ith material.
4.3.3 The wood-based panel and decorated wood-based panel used in the indoor decoration of Class I civil building engineering must meet the requirements of Grade E1.
4.3.4 Grade E1 wood-based panel and decorated wood-based panel should be used for the indoor decoration of Class II civil building engineering, and when Grade E2 wood-based panel is used, the parts directly exposed to the air shall be coated and sealed.
4.3.5 The coatings, adhesives, water-based treatment agents and other materials used in the indoor decoration of civil building engineering shall meet the requirements hereof.
4.3.6 Polyvinyl alcohol water glass interior wall coatings, polyvinyl formal interior wall coatings and oil in water (O/W) multicolor interior wall coatings with nitrocellulose as main resin and xylene as main solvent shall not be used for indoor decoration of civil building engineering.
4.3.7 Polyvinyl alcohol adhesive shall not be used for indoor decoration of civil building engineering.
4.3.8 It is strictly forbidden to use asphalt, coal tar oil anti-corrosion and moisture-proof agents for wood floor covering and other wood materials used in indoor decoration of civil building engineering.
4.3.9 When the plastic floor is pasted in the indoor decoration of Class I civil building engineering, solvent-thinned adhesives shall not be used.
4.3.10 When pasting plastic floors in basements and rooms that are not directly ventilated with the outside in Class II civil building engineering, solvent-thinned adhesives should not be used.
4.3.11 Urea formaldehyde foam plastics shall not be used indoors as insulation, heat insulation and sound absorption materials in civil building engineering.
5 Engineering construction
5.1 General requirements
5.1.1 The development and construction organizations shall be in accordance with the design requirements and the relevant requirements hereof, the random admission re-inspection shall be conducted on building materials and decoration materials used.
5.1.2 When the admission inspection results of building materials and decoration materials do not meet the design requirements and the relevant requirements hereof, it is strictly prohibited to use them.
5.1.3 The construction organization shall carry out the construction according to the design requirements and the relevant requirements hereof, and shall not change the requirements of design documents without authorization. When changes are needed, design changes shall be carried out according to the specified procedures.
5.1.4 The construction organization shall prepare the "Special organization design and construction scheme for indoor environmental pollution control of building engineering" according to the design requirements and the relevant requirements hereof. This scheme shall be submitted to the supervision organization and the owner organization for approval together with the "Unit engineering construction organization design and construction scheme".
5.2 Admission inspection of materials
5.2.1 The inorganic nonmetallic building materials and their products such as concrete, ready-mixed mortar, prefabricated members and wall materials used in civil building engineering shall have their radioactive detection reports, and shall meet the design requirements and the requirements hereof.
5.2.2 The inorganic nonmetallic building materials and their products such as concrete, ready-mixed mortar, prefabricated members and wall materials used by each construction organization's engineering shall be re-inspected for radioactivity indicators according to different manufacturers and different varieties of materials.
5.2.3 The inorganic nonmetallic decoration materials used in indoor decoration of civil building engineering shall have radioactivity indicator detection reports of products, and shall meet design requirements and the requirements hereof.
5.2.4 When the usable area of natural granite stone or porcelain brick used for indoor decoration by each construction unit project is greater than 200m2, the re-inspection of radioactive indicators shall be conducted for different products and different batches of materials.
5.2.5 When wood-based panels and decorated wood-based panels used in indoor decoration of civil building engineering enter the site, there must be a detection report for content of free formaldehyde or released formaldehyde, which shall meet the design requirements and the requirements hereof.
5.2.6 When the area of wood-based panels or decorated wood-based panels used in indoor decoration by each construction organization's engineering is greater than 500m2, the random inspection and re-inspection shall be conducted on the content of free formaldehyde or released formaldehyde of different products and different batches of materials.
5.2.7 The water-based coatings, water-based adhesives, water-based treatment agents, solvent-thinned coatings and solvent-thinned adhesives used in indoor decoration of civil building engineering must have the detection reports of harmful substances for the same batch of products, and shall meet the design requirements and the requirements hereof.
5.2.8 When water-based coatings, water-based adhesives, water-based treatment agents, solvent-thinned coatings, solvent-thinned adhesives and other decoration materials are used in each construction organization's engineering, the re-inspection of pollutant content shall be conducted for materials with different product types from different manufacturers and different batches.
5.3 Requirements for construction
5.3.1 For civil building engineering with radon prevention measures, the construction technology of special parts such as deformation joints, construction joints, through-wall pipes (boxes), buried parts and reserved holes of its underground work shall meet the relevant requirements of the current national standard GB 50108 Technical code for waterproofing of underground works.
5.3.2 When non-local soil is used as the backfill for Class I civil building engineering, the specific activities of radium-266, thorium-232 and potassium-40 shall be determined. It may only be used when internal exposure index (IRa) is not greater than 1.0 and external exposure index (Ir) is not greater than 1.3.
5.3.3 It is strictly prohibited to use benzene, industrial benzene, petroleum benzene, heavy benzene and mixed benzene as diluent and solvent in indoor decoration of civil building engineering.
5.3.4 During indoor decoration of civil building engineering, the methylbenzene, dimethylbenzene and gasoline shall not be used for oil removal and old paint removal.
5.3.5 The coatings, adhesives, water-based treatment agents, diluents and solvents shall be sealed and stored in time after use, and the wastes shall be cleared out of the room in time.
5.3.6 It is strictly forbidden to clean the construction equipment with organic solvent in the room of civil building engineering.
5.3.7 In the indoor decoration of civil building engineering, when splicing the decorated wood-based panels, except the core board (Class E1), the cross section and the undecorated parts shall be sealed.
5.3.8 During the construction of wallpaper (covering), carpet, decorative panel, suspended ceiling, etc., attention shall be paid to moisture resistance, local wet areas shall not be covered. The condensate water drainage for air conditioning shall meet the relevant requirements of the current national standard GB 50019 Design code for heating ventilation and air conditioning.
Foreword i
1 General provisions
2 Terms
3 Materials
3.1 Inorganic non-metallic main building materials and decoration materials
3.2 Wood-based panels and decorated wood-based panels
3.3 Coating
3.4 Adhesive
3.5 Water-based treatment agent
3.6 Other materials
4 Survey and design for building engineering
4.1 General requirement
4.2 Radon concentration detection and resistant measures on engineering sites
4.3 Choice of materials
5 Engineering construction
5.1 General requirements
5.2 Admission inspection of materials
5.3 Requirements for construction
6 Acceptance
6.1 General requirements
6.2 Number of randomly inspected room
6.3 On-site sampling methods
6.4 Detection methods
6.5 Detection result judgment and re-inspection for unqualified item
6.6 Format of original detection records and detection report
7 Quality assurance and quality control
7.1 Qualification
7.2 Personnel requirements
7.3 Instruments and equipment
7.4 Quality control of on-site sampling and detection
7.5 Laboratory quality control
Annex A Determination of content of released formaldehyde in materials using environmental test chamber
Annex B Determination of volatile organic compound (VOC) and benzenes in solvent-thinned coatings and adhesives
B.1 Determination of volatile organic compound (VOC) in solvent-thinned coatings and adhesives
B.2 Determination of the content of benzene, methyl benzene + dimethylbenzene + ethylbenzene in solvent-based coatings
B.3 Determination of the content of benzene, methylbenzene + dimethylbenzene in solvent-thinned adhesives
Annex C Determination of radon concentration in soil and radon exhalation rate from soil surface
C.1 Determination of radon concentration in soil
C.2 Determination of radon exhalation rate from soil surface
Annex D Determination of radon concentration in indoor air by activated carbon box method
D.1 Radon measurement with activated carbon box with diffusion barrier
D.2 Radon measurement with activated carbon box without diffusion barrier
D.3 Quality assurance
Annex E Determination method for TVOC and benzene in indoor air
Annex F Determination method for activated carbon of benzene in indoor air
Annex G Format of original detection record and detection report
G.1 Format of original detection record
G.2 Format of detection report
Explanation of wording in this code
List of quoted standards
