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GB 50666-2011: Code for construction of concrete structures
GB 50666-2011
Code for Construction of Concrete Structures
NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50666-2011
ISSUED ON: JULY 29, 2011
IMPLEMENTED ON: AUGUST 1, 2012
Issued by: Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine of PRC.
Table of Contents
1 General Provisions ... 9
2 Terms ... 10
3 Basic Requirements ... 12
3.1 Construction Management ... 12
3.2 Construction Technology ... 12
3.3 Construction Quality and Safety ... 13
4 Formwork ... 15
4.1 General Requirements ... 15
4.2 Materials ... 15
4.3 Design ... 15
4.4 Fabrication and Installation ... 20
4.5 Removal and Maintenance ... 24
4.6 Quality Control ... 25
5 Reinforcement ... 27
5.1 General Requirements ... 27
5.2 Materials ... 27
5.3 Reinforcement Fabrication ... 28
5.4 Reinforcement Connection and Fixing ... 30
5.5 Quality Control ... 34
6 Prestressed Concrete ... 37
6.1 General Requirements ... 37
6.2 Materials ... 37
6.3 Fabrication and Installation ... 38
6.4 Post-tensioning and Pre-tensioning ... 42
6.5 Grouting and Anchorage Protection ... 46
6.6 Quality Control ... 48
7 Concrete Production and Transportation ... 51
7.1 General Requirements ... 51
7.2 Materials ... 51
7.3 Mix Proportioning ... 54
7.4 Mixing ... 57
7.5 Transportation ... 59
7.6 Quality Control ... 59
8 Cast-in-situ Concrete ... 63
8.1 General Requirements ... 63
8.2 Conveying ... 63
8.3 Placing ... 66
8.4 Compacting ... 72
8.5 Curing ... 73
8.6 Construction Joint and Post-cast Strip ... 75
8.7 Crack Control of Mass Concrete ... 77
8.8 Quality Control ... 80
8.9 Repair of Concrete Defects ... 82
9 Precast Concrete ... 85
9.1 General Requirements ... 85
9.2 Checking ... 85
9.3 Production ... 88
9.4 Storage and Transportation ... 90
9.5 Erection ... 91
9.6 Quality control ... 94
10 Construction in Cold, Hot and Rainy Weather ... 97
10.1 General Requirements ... 97
10.2 Cold Weather Requirements ... 97
10.3 Hot Weather Requirements ... 101
10.4 Rainy Weather Requirements ... 103
11 Environmental Protection ... 105
11.1 General Requirements ... 105
11.2 Environmental Considerations ... 105
Appendix A -- Characteristic Value of Loads Acting on Formwork ... 107
Appendix B -- Nominal Diameter, Nominal Sectional Area, Calculation Sectional Area and
Theoretical Weight of Common Reinforcement ... 110
Appendix C -- Minimum Splicing Length of Longitudinal Reinforcement ... 112
Appendix D -- Calculation and Measurement Method for Elongation of Prestressed
Tendon ... 114
Appendix E -- Testing Method for Prestressing Loss Due to Friction ... 116
Appendix F -- Specification of Concrete Materials ... 118
Explanation of Wording in This Code ... 124
List of Quoted Standards ... 125
1 General Provisions
1.0.1 This Code is formulated with a view to implementing the national technical and
economic policies, ensuring the engineering quality, and realizing advanced
technology, reasonable process, resources conservation and environmental
protection during the construction of concrete structures.
1.0.2 This Code is applicable to the construction of concrete structures in building
engineering, not to the construction of lightweight aggregate concrete and special
concrete.
1.0.3 This Code contains the basic requirements for the construction of concrete
structures. When there are special requirements for the construction stated in the
design documents, the construction shall also be implemented in accordance with the
design documents.
1.0.4 Construction of concrete structures shall not only meet the requirements of this
Code but also comply with those in the current relevant standards of the nation.
2 Terms
2.0.1 Concrete structure
The structure mainly made of concrete, including plain concrete structure, reinforced
concrete structure and prestressed concrete structure, which may be classified into
cast-in-situ concrete structure and precast concrete structure according to the
construction method.
2.0.2 Cast-in-situ concrete structure
The concrete structure that is made by erecting formwork in situ and integral casting,
hereinafter referred to as cast-in-situ structure.
2.0.3 Precast concrete structure
The concrete structure that is made by assembling and connecting the precast
concrete members or parts, hereinafter referred to as precast structure.
2.0.4 Workability of concrete
The features that shall be possessed of by the concrete mixture in order to meet the
construction operation requirements and ensure the concrete uniformity and
compactness, mainly including flowability, cohesiveness and water-retaining property.
It is hereinafter referred to as workability of concrete.
2.0.5 Self-compacting concrete
The concrete that can flow and be compacted under the action of deadweight,
dispensing with the vibration by external force.
2.0.6 Pre-tensioning
It is a kind of construction method that establishes prestress by firstly post-tensioning
the prestressed tendon on a pedestal or formwork and temporarily anchoring it with
grip, concreting and then pre-tensioning the prestressed tendon after the concrete
reaching a certain specified strength.
2.0.7 Post-tensioning
It is a kind of construction method that establishes prestress by post-tensioning the
prestressed tendon after the concrete of a structural member reaching a certain
3 Basic Requirements
3.1 Construction Management
3.1.1 The construction organizations for the concrete structures shall have
corresponding qualification and establish corresponding quality management system
as well as construction quality control and inspection system.
3.1.2 Organization structuring and manning of construction project department shall
meet the construction management requirements of concrete structures. Construction
operation personnel shall receive training to acquire the basic knowledge and skills
required for their respective posts.
3.1.3 Before construction, the development organization shall organize the design,
construction and supervision organizations to carry out the technical disclosure and
joint trial for the design documents. The in-depth design documents completed by the
construction organization shall be confirmed by the original design organization.
3.1.4 The construction organization shall ensure the authenticity, effectiveness,
integrity and completeness of the construction documents. Construction project
technical leader shall organize the data preparation, collection, arrangement,
examination and verification, and timely archiving and filing during the whole
construction process.
3.1.5 The construction organization shall establish specific construction schemes
according to the requirements of the design documents and construction organization
design, which shall be implemented after examined and approved by the supervision
organization.
3.1.6 Before construction of concrete structures, the construction organization shall
establish emergency plan upon the contingent hazards, disasters and emergencies at
the construction site. Technical disclosure and training shall be carried out for the
emergency plan, and drilling shall be carried out if necessary.
3.2 Construction Technology
3.2.1 Before construction of concrete structures, the construction process shall be