GB 50496-2018 PDF English
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| GB 50496-2018 | English | 510 |
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GB 50496-2018: Code for construction of mass concrete---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/GB50496-2018
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB/T 50496-2018
Standard for construction of mass concrete
Issued on. APRIL 25, 2018
Implemented on. DECEMBER 01, 2018
Issued by. Ministry of Housing and Urban-Rural Development of PRC.
State Administration for Market Regulation.
Standard for construction of mass concrete
Main drafting organization. Ministry of Housing and Urban-Rural Development of
PRC
Approved by. Ministry of Housing and Urban-Rural Development of PRC
Date of implementation. December 01, 2018
China Construction Industry Press
2018 Beijing
Announcement of the Ministry of Housing and Urban-Rural
Development of the People's Republic of China
2018 No.77
Table of Contents
Foreword... 5
1 General provisions... 8
2 Terms and symbol... 8
3 Basic requirements... 13
4 Materials, mix proportioning, production and transportation... 14
5 Construction... 18
6 Temperature monitor and control... 23
Appendix A Computing method for concrete pump output and carriers... 26
Appendix B Computing method of thermal stress and shrinkage stress during
construction of mass concrete... 27
Appendix C Computing method of insulation layer thickness of mass concrete... 37
Explanation of wording in this standard... 40
List of quoted standards... 41
1 General provisions
1.0.1 This standard is formulated in order to implement national technical and economic
policies in mass concrete construction, ensure project quality, achieve advanced
technology, reasonable process, resource saving, environment protection.
1.0.2 This standard applies to mass concrete construction in concrete structures. It is
not applicable to the construction of roller compacted concrete and hydraulic mass
concrete.
1.0.3 In addition to complying with this standard, mass concrete construction shall also
comply with the relevant current national standards.
2 Terms and symbol
2.1 Terms
2.1.1 Mass concrete
A large volume concrete which has a minimum physical dimension of not less than 1
m, OR concrete which is expected to cause harmful cracks due to temperature changes
and shrinkage caused by hydration of the cementitious materials in the concrete.
2.1.2 Cementitious material
A general term for Portland cement and active mineral admixtures used to prepare
concrete.
2.1.5 Vertical construction seam
The vertical reserved joint which is left in appropriate positions, when the pouring pause
time may exceed the initial setting time of concrete, during the noncontinuous placing
of concrete.
2.1.6 Horizontal construction seam
The horizontal reserved joint which is left in appropriate positions, when the pouring
pause time may exceed the initial setting time of concrete, during the noncontinuous
placing of concrete.
2.1.7 Thermal stress
The stress generated inside the concrete, when the temperature deformation of the
concrete is restrained.
2.1.8 Shrinkage stress
The stress generated inside the concrete, when the shrinkage deformation of the
concrete is restrained.
2.1.9 Peak value of rising temperature
The maximum temperature rise inside the concrete cast block.
2.1.10 Temperature difference of core and surface
The difference -- between the maximum temperature inside the concrete block and the
temperature 50 mm inside the outer surface.
2.2 Symbol
2.2.1 Temperature and material properties
a - Thermal diffusivity of concrete;
C - Specific heat capacity of concrete;
3 Basic requirements
3.0.1 Mass concrete construction shall prepare a construction program or construction
technical plan, which shall include technical measures for environmental protection and
safe construction.
3.0.4 The temperature control indicators for mass concrete construction shall comply
with the following requirements.
3.0.6 Mass concrete construction shall adopt energy-saving, material-saving, water-
saving, land-saving, environmental protection measures. It shall comply with the
relevant provisions of the current national standard "Code for green construction of
building" GB/T 50905.
4 Materials, mix proportioning, production and transportation
4.1 General requirements
4.1.1 In addition to meeting the design requirements for strength grade, durability,
impermeability, volume stability, the mass concrete's mix proportion design shall also
meet the requirements for mass concrete construction technology; it shall use materials
rationally and reduce the adiabatic temperature rise of concrete.
4.2 Materials
4.2.1 The selection and quality of cement shall comply with the following requirements.
4.2.2 When cement used for mass concrete enters the site, it shall check the cement
variety, code, strength grade, packaging or bulk number, date of exit-factory, etc.;
it shall inspect the strength, stability, setting time, heat of hydration of the cement.
The inspection results shall comply with the relevant provisions of the current
national standard "Common Portland cement" GB 175.
4.3.2 Before preparing concrete, it should conduct tests on technical parameters such as
adiabatic temperature rise, bleeding rate, pumpability, etc. that have an impact on the
control of cracks in mass concrete. If necessary, the mix proportioning design shall be
verified through trial pumping.
4.3.3 When determining the concrete mix proportioning, it shall propose the technical
measures for coarse and fine aggregate and mixing water during concrete preparation
and control of temperature of mixture placing to mold, based on the requirements of the
concrete adiabatic temperature rise and temperature control construction plan.
4.4 Production and transportation
4.4.4 The number of mixer trucks shall meet the requirements of concrete pouring
technology; the calculation method can be determined according to Appendix A of this
standard.
5 Construction
5.1 General requirements
5.1.1 The construction program of mass concrete construction shall include the
following main contents.
5.1.3 The thickness of the thermal insulation covering layer can be determined based
on Appendix C of this standard, according to the requirements of the temperature
control indicators.
5.1.4 Mass concrete construction should adopt overall layered or push-type continuous
pouring construction.
5.2 Technology preparation
5.2.1 Before the construction of mass concrete, it shall carry out joint review of the
drawings; propose comprehensive anti-cracking measures during the construction stage;
formulate the construction work instructions for key locations.
5.2.2 Mass concrete construction shall be carried out on the basis that the concrete
formwork and brackets, steel bar engineering, embedded pipe fittings and other work
have been completed and accepted.
5.3 Formwork
5.3.1 It shall check the bearing capacity, stiffness, overall stability of mass concrete
formwork and brackets; it shall design the thermal insulation structure based on
the maintenance methods used for mass concrete.
5.3.2 Safety and stability measures must be taken, during the installation, use, removal
of formwork and support systems.
5.5 Curing
5.5.1 Mass concrete shall be cured with thermal insulation and moisturizing. After each
concrete placing, in addition to regular curing as ordinary concrete, thermal insulation
curing shall comply with the following requirements.
5.6 Construction in special climate
5.6.1 When mass concrete construction encounters high temperatures, winter, strong
winds or rain or snow, measures must be taken to ensure the quality of concrete pouring.
6 Temperature monitor and control
6.0.1 The temperature difference of core and surface of the mass concrete, the
descending speed of temperature, the ambient temperature shall be tested not less than
4 times every day and night after the concrete is placed; the temperature of mixture
placing to mold shall be measured not less than 2 times per shift.
6.0.3 Strain test should be carried out according to project needs.
6.0.4 The selection of test components shall comply with the following requirements.
6.0.6 During the test process, the temperature change curve of each point and the cross-
section temperature distribution curve shall be drawn.
6.0.7 When abnormal monitoring results are found, it shall sound the alarm immediately
and take corresponding measures.
6.0.8 Temperature control measures can be adjusted in real time based on the following
principles or methods and combined with monitoring data.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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