GB 50325-2020 PDF English
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Standard for indoor environmental pollution control of civil building engineering
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Code for indoor environmental pollution control of civil building engineering
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GB 50325-2020: Standard for indoor environmental pollution control of civil building engineering
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50325-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50325-2020
Standard for indoor environmental pollution control of
civil building engineering
Issued on. JANUARY 16, 2020
Implemented on. AUGUST 01, 2020
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
State Administration for Market Regulation.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Standard for indoor environmental pollution control of
civil building engineering
Editor-in-Chief. Ministry of Housing and Urban-Rural Development of the
People's Republic of China
Approved by. Ministry of Housing and Urban-Rural Development of the
People's Republic of China
Date of implementation. August 1, 2020
China Planning Press
2020 Beijing
Table of Contents
Foreword... 5
1 General provisions... 7
2 Terms and symbols... 8
2.1 Terms... 8
2.2 Symbols... 9
3 Building materials... 10
3.1 Inorganic nonmetallic building materials... 10
3.2 Wood-based panels and finishing products... 10
3.3 Coatings... 11
3.4 Adhesives... 12
3.5 Water-based treatment agents... 13
3.6 Others... 13
4 Survey and designing for building engineering... 16
4.1 General requirements... 16
4.2 Radon concentration measurement and resistance on construction sites... 16
4.3 Choice of construction materials... 18
5 Construction... 20
5.1 General requirements... 20
5.2 On-site examination on building materials... 22
5.3 Requirements for construction... 23
6 Inspection and acceptances... 25
Appendix A Measurement of radon exhalation rate... 30
Appendix B Measurement of content of formaldehyde and VOC emission in
decorations materials using environmental test chamber... 33
Appendix C Measurements of radon concentration in soil and radon exhalation
rate... 36
Appendix D Measurement of indoor benzene, toluene, xylene... 41
Appendix E Measurement indoor TVOC... 45
Explanation of wording in this standard... 49
List of quoted standards... 50
1 General provisions
1.0.1 This standard is formulated, in order to prevent and control indoor
environmental pollution, which is caused by main materials and decoration
materials, in civil construction projects; protect public health; safeguard public
interests; achieve advanced technology and economical rationality.
1.0.2 This standard is applicable to the control of indoor environmental pollution,
in newly constructed, expanded, reconstructed civil construction projects.
1.0.3 The indoor environmental pollutants, which are controlled by this standard,
include radon, formaldehyde, ammonia, benzene, toluene, xylene. total volatile
organic compounds.
1.0.4 The division of civil construction projects shall meet the following
requirements.
1 The category I civil buildings shall include residences, residential functional
apartments, hospital wards, elderly care housing facilities, kindergartens,
school classrooms, student dormitories, etc.;
2 The 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 main building materials and decoration materials, which are selected
for civil construction projects, shall comply with the relevant provisions of this
standard.
1.0.6 The indoor environmental pollution control of civil buildings shall not only
comply with the provisions of this standard, BUT also comply with the relevant
current national standards.
2 Terms and symbols
2.1 Terms
2.1.1 Civil building engineering
The general term for newly built, expanded, reconstructed civil building
structural engineering and decoration engineering.
2.1.2 Environmental test chamber
An equipment, which simulates the indoor environment, to test the release
of chemical pollutants from decoration materials.
2.1.3 Radon exhalation rate from the surface
The radioactive activity of radon, which is released from soil or material
surface per unit area and unit time.
2.1.6 Radon concentration
The radioactive activity of radon per unit volume of air.
2.1.7 Wood-based panels
The panels or formed products, which are produced by using wood or non-
wood plant fibers as the main raw material; processing it into various material
units; applying (or not applying) adhesives and other additives; gluing
together.
2.1.12 Volatile organic compound
Under the detection conditions as specified in this standard, the total amount
of volatile organic compounds in the measured material, shortly referred to
as VOC.
2.1.13 Decorate material loading factor
In interior decoration, the ratio of the total exposed area of the decoration
materials used TO the net space volume of the room.
3 Building materials
3.1 Inorganic nonmetallic building materials
3.1.1 For inorganic non-metallic main building materials, such as sand,
stone, brick, solid block, cement, concrete, concrete prefabricated
components, etc. which are used in civil construction projects, the
radioactive limit shall comply with the requirements of the current
national standard "Limits of radionuclides in building materials" GB 6566.
3.1.4 The measurement method of radionuclides of main materials and
decoration materials shall comply with the relevant provisions of the current
national standard "Limits of radionuclides in building materials" GB 6566.The
measurement method of radon exhalation rate from the surface shall comply
with the provisions of Appendix A of this standard.
3.2 Wood-based panels and finishing products
3.2.1 The release of free formaldehyde shall be measured, for the wood-based
panels and its products, as used indoors in civil construction projects.
3.3 Coatings
3.3.1 The free formaldehyde limit of indoor water-based decorative panel
coatings, water-based wall coatings, water-based wall putty, for civil
construction projects shall comply with the current national standard "Limit of
harmful substances of architectural wall coatings" GB 18582.
4 Survey and designing for building engineering
4.1 General requirements
4.1.1 For newly-built or expanded civil construction projects, before
design, it shall survey the radon concentration in the soil OR the radon
exhalation rate from the surface in the urban area, where the construction
project is located;
4.1.2 The interior decoration and decoration design of civil buildings shall have
pollution control measures. It shall conduct pre-assessment of decoration and
decoration design pollution control; control the load ratio of decoration and
decoration materials AND the release of material pollutants; adopt advanced
technologies such as prefabricated decoration products; the finished products
and parts for decorative purposes should be processed in the factory AND
installed on site.
4.2 Radon concentration measurement and resistance on
construction sites
4.2.1 For the engineering geological survey data of the newly-built and
expanded civil construction projects, it shall include the historical measurement
data of soil radon concentration or soil radon exhalation rate from the surface
AND the average data of soil radon concentration or radon exhalation rate from
soil the surface, in the urban area where the project is located.
4.2.4 When the measurement result of radon concentration in the soil of
civil construction projects is greater than 20000 Bq/m3 and less than
30000 Bq/m3, OR the radon exhalation rate from the surface is greater than
0.05 Bq/(m2 • s) and less than 0.10 Bq/(m2 • s), it shall take anti-cracking
measures at the ground floor of the building.
4.2.5 When the soil radon concentration of the civil construction site is
not less than 30000 Bq/m3 and less than 50000 Bq/m3, OR the radon
exhalation rate from the surface is not less than 0.10 Bq/(m2 • s) and less
than 0.30 Bq/(m2 • s), in addition to taking anti-cracking measures for the
ground floor of the building, the foundation must also be treated,
according to the grade-1 waterproofing requirements in the current
national standard "Technical code for waterproofing of underground
works" GB 50108.
4.2.6 When the average radon concentration in the civil construction site
4.3 Choice of construction materials
4.3.1 The radioactive limit of inorganic non-metallic decorative materials,
which is used in the interior decoration of the category I civil buildings,
must meet the requirements of category A, which is stipulated in the
current national standard "Limits of radionuclides in building materials"
GB 6566.
4.3.9 In civil construction projects, when the external wall adopts the internal
thermal insulation system, it shall select the thermal insulation material with
good environmental protection performance; the surface shall be tightly closed;
the urea-formaldehyde resin foam material shall not be used as thermal
insulation, heat insulation, sound absorbing material.
5 Construction
5.1 General requirements
5.1.1 When materials enter the site, the pollutant release amount or content of
the main building materials and decoration materials shall be spot-checked and
rechecked, according to the design requirements and the relevant provisions of
this standard.
5.1.3 When the main building materials and decoration materials are inspected
AND found to be inconsistent with the design requirements and the relevant
provisions of this standard, they shall not be used.
5.1.4 The construction organization shall carry out construction, in accordance
with the design requirements and the relevant provisions of this standard; it
shall not change the requirements of the design documents without
authorization. When it needs to be changed, it shall be confirmed by the original
design organization, in accordance with the relevant provisions of the
construction change procedure.
5.2 On-site examination on building materials
5.2.1 When the inorganic non-metallic main building materials and
building decoration materials, which are used in civil construction
projects, enter the site, the construction organization shall check the test
report of radioactive index.
5.2.8 When the detection items of main building materials and decoration
materials are incomplete OR there is doubt about the test results, the materials
shall be tested AND can be used only after passing the test.
5.3 Requirements for construction
5.3.1 For civil construction projects, which adopt anti-radon design measures,
the construction technology of special parts, such as deformation joints,
construction joints, wall-penetrating pipes (boxes), embedded parts, reserved
holes, etc. of the underground engineering, shall comply with the relevant
provisions of the current national standard "Technical code for waterproofing of
underground works" GB 50108.
5.3.6 It is strictly forbidden to use organic solvents to clean construction
tools, in the interior decoration of civil buildings.
5.3.7 For civil construction projects in heating areas, interior decoration work
should not be carried out, during the heating period.
5.3.8 During the decoration and construction of lightweight partition walls,
finishing works, pasting and soft packs, doors and windows, decorative panels,
suspended ceilings, etc., attention shall be paid to moisture-proof and avoid
covering local wet areas.
6 Inspection and acceptances
6.0.1 The indoor environmental quality acceptance of civil construction projects
and interior decoration projects shall be carried out, not less than 7 days after
the completion of the project AND before the project is handed over for use.
6.0.2 When the civil construction project is completed and accepted, the
following documents shall be checked.
6.0.3 The categories, quantities, construction techniques of the main building
materials and decoration materials, which are used in civil construction projects,
shall meet the design requirements AND comply with the relevant provisions of
this standard.
6.0.8 For the detection of formaldehyde, in the indoor air of civil buildings, it
may adopt a simple sampling instrument detection method.
6.0.22 When the detection results of the indoor environmental pollutant
concentration do not meet the requirements in Table 6.0.4 of this standard,
THEN, for the non-conforming items, it shall double the sampling quantity for
detection, which shall include the original unqualified rooms of the same type
and the original unqualified rooms.
6.0.23 For civil construction projects, whose detection results of indoor
environmental pollutant concentration, do not meet the requirements in
Table 6.0.4 of this standard, they are strictly prohibited from being
delivered and put into use.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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