Standard for indoor environmental pollution control of civil building engineering
1 General provisions
1.0.1 This standard is developed in order to prevent and control indoor environmental pollution caused by major materials and decoration materials in civil building engineering, protect public health, safeguard public interests, and achieve advanced level of technology and economic efficiency.
1.0.2 This standard is applicable to indoor environmental pollution control for new construction, extension and renovation of civil buildings.
1.0.3 Indoor environmental pollutants controlled by this standard include radon, formaldehyde, ammonia, benzene, toluene, xylene and total volatile organic compounds.
1.0.4 Civil buildings shall be classified as follows:
1 Category I civil buildings shall include residential buildings, residential apartments, hospital wards, housing facilities for elderly care, kindergartens, school classrooms, student dormitories, etc.;
2 Category II civil buildings shall include office buildings, shops, hotels, cultural and entertainment venues, bookstores, libraries, exhibition halls, gymnasiums, public transportation waiting rooms, restaurants, etc.
1.0.5 The major materials and decoration materials selected for civil building engineering shall comply with the relevant provisions of this standard.
1.0.6 The indoor environmental pollution control of civil buildings shall comply with current relevant national standards, in addition to this standard.
2 Terms and symbols
2.1 Terms
2.1.1 civil building engineering
generic term for civil building engineering and decoration engineering in new construction, extension and renovation
2.1.2 environmental test chamber
setup that simulates indoor environment to measure the emissions of chemical pollutants from decoration materials
2.1.3 radon exhalation rate from the surface
radioactivity of radon exhaled from the surface of soil or material per unit area and time
2.1.4 internal exposure index (IRa)
quotient obtained by dividing the specific activity of the natural radionuclide radium-226 in the major materials and decoration materials of the building by the specific activity limit value of 200
2.1.5 external exposure index (Iγ)
sum of the quotients obtained by dividing the specific activity of the natural radionuclide radium-226, thorium-232 and potassium-40 in the major materials and decoration materials of the building by the specific activity limit value of 370, 260 and 4200 respectively
2.1.6 radon concentration
radioactivity of radon in air per unit volume
2.1.7 wood-based panels
panels assembled with blanks by means of adhesive, or formed products, which are composed of material units, made from wood or non-wood plant fibers as the main raw materials, with or without adhesive and other additive applied, mainly including plywood, fiberboard, particleboard and its surface decorative panel
2.1.8 wood-plastic composite products
product made of wood fiber material and thermoplastic polymer in a certain proportion, mainly including wood-plastic flooring, wood-plastic decorative panels, wood-plastic doors, etc.
2.1.9 water-based treatment agents
liquid with water as diluent that can be absorbed into the major materials and decoration materials so as to improve its flame-retardant, waterproof, and anti-corrosion properties
2.1.10 bulk construction adhesive
adhesive, the solvent content or water content of which accounts for less than 5% of the total mass of the adhesive
2.1.11 total volatile organic compounds
total amount of volatile organic compounds in the air measured under the conditions specified hereof, henceforth “TVOC”
Foreword ii
1 General provisions
2 Terms and symbols
3 Building materials
4 Survey and designing for building engineering
5 Construction
6 Inspection and acceptance
Annex A Measurement of radon exhalation rate
Annex B Measurement of content of formaldehyde and VOC emission in decoration materials using environmental test chamber
Annex C Measurements of radon concentration in soil and radon exhalation rate
Annex D Measurement of indoor benzene, toluene and xylene
Annex E Measurement of indoor TVOC
Explanation of wording in this standard
List of quoted standards
Standard for indoor environmental pollution control of civil building engineering
1 General provisions
1.0.1 This standard is developed in order to prevent and control indoor environmental pollution caused by major materials and decoration materials in civil building engineering, protect public health, safeguard public interests, and achieve advanced level of technology and economic efficiency.
1.0.2 This standard is applicable to indoor environmental pollution control for new construction, extension and renovation of civil buildings.
1.0.3 Indoor environmental pollutants controlled by this standard include radon, formaldehyde, ammonia, benzene, toluene, xylene and total volatile organic compounds.
1.0.4 Civil buildings shall be classified as follows:
1 Category I civil buildings shall include residential buildings, residential apartments, hospital wards, housing facilities for elderly care, kindergartens, school classrooms, student dormitories, etc.;
2 Category II civil buildings shall include office buildings, shops, hotels, cultural and entertainment venues, bookstores, libraries, exhibition halls, gymnasiums, public transportation waiting rooms, restaurants, etc.
1.0.5 The major materials and decoration materials selected for civil building engineering shall comply with the relevant provisions of this standard.
1.0.6 The indoor environmental pollution control of civil buildings shall comply with current relevant national standards, in addition to this standard.
2 Terms and symbols
2.1 Terms
2.1.1 civil building engineering
generic term for civil building engineering and decoration engineering in new construction, extension and renovation
2.1.2 environmental test chamber
setup that simulates indoor environment to measure the emissions of chemical pollutants from decoration materials
2.1.3 radon exhalation rate from the surface
radioactivity of radon exhaled from the surface of soil or material per unit area and time
2.1.4 internal exposure index (IRa)
quotient obtained by dividing the specific activity of the natural radionuclide radium-226 in the major materials and decoration materials of the building by the specific activity limit value of 200
2.1.5 external exposure index (Iγ)
sum of the quotients obtained by dividing the specific activity of the natural radionuclide radium-226, thorium-232 and potassium-40 in the major materials and decoration materials of the building by the specific activity limit value of 370, 260 and 4200 respectively
2.1.6 radon concentration
radioactivity of radon in air per unit volume
2.1.7 wood-based panels
panels assembled with blanks by means of adhesive, or formed products, which are composed of material units, made from wood or non-wood plant fibers as the main raw materials, with or without adhesive and other additive applied, mainly including plywood, fiberboard, particleboard and its surface decorative panel
2.1.8 wood-plastic composite products
product made of wood fiber material and thermoplastic polymer in a certain proportion, mainly including wood-plastic flooring, wood-plastic decorative panels, wood-plastic doors, etc.
2.1.9 water-based treatment agents
liquid with water as diluent that can be absorbed into the major materials and decoration materials so as to improve its flame-retardant, waterproof, and anti-corrosion properties
2.1.10 bulk construction adhesive
adhesive, the solvent content or water content of which accounts for less than 5% of the total mass of the adhesive
2.1.11 total volatile organic compounds
total amount of volatile organic compounds in the air measured under the conditions specified hereof, henceforth “TVOC”
Contents of GB 50325-2020
Foreword ii
1 General provisions
2 Terms and symbols
3 Building materials
4 Survey and designing for building engineering
5 Construction
6 Inspection and acceptance
Annex A Measurement of radon exhalation rate
Annex B Measurement of content of formaldehyde and VOC emission in decoration materials using environmental test chamber
Annex C Measurements of radon concentration in soil and radon exhalation rate
Annex D Measurement of indoor benzene, toluene and xylene
Annex E Measurement of indoor TVOC
Explanation of wording in this standard
List of quoted standards
