1.0.1 This code is formulated with a view to reinforcing the quality management of building structure strengthening engineering, unifying the acceptance of construction quality of building structure strengthening engineering and to guaranteeing the engineering quality and security.
1.0.2 This code is applicable to the construction process control and construction quality acceptance of the strengthening engineering of concrete structure, masonry structure and steel structure.
1.0.3 The requirements on quality of strengthening engineering as specified in the technical documents and contract agreement of building structure strengthening engineering shall not be less than the requirements of this code.
1.0.4 This code shall be used together with the following current national standards:
1 “Unified Standard for Constructional Quality Acceptance of Building Engineering” (GB 50300);
2 “Code for Acceptance of Constructional Quality of Concrete Structures” (GB 50204);
3 “Code for Acceptance of Construction Quality of Masonry Engineering” (GB 50203);
4 “Code for Acceptance of Construction Quality of Steel Structures” (GB 50205).
1.0.5 The construction process control and construction quality acceptance of building structure strengthening engineering not only shall comply with this code and its supporting standards and codes, but also shall comply with those specified in the current relevant standards of the nation.
2 Terms
2.1 General Terms
2.1.1 Structure strengthening engineering
The bearing structures, members and their relevant portions with insufficient reliability are strengthened or with their internal force adjusted to make them be with adequate security and durability and to keep their applicability as much as possible.
2.1.2 Quality of structure strengthening engineering
It is the characteristic sum reflecting the structure strengthening engineering meets the requirements of current relevant standards or the requirements agreed in the contract, including all the obvious and implicit abilities of structure strengthening engineering in such aspects as the safety performance, endurance quality, functions of use and environmental protection.
2.1.3 Acceptance
Based on the inspection and evaluation on the quality of structure strengthening engineering of the construction organization, the organizations concerned participating in this engineering activity shall jointly carry out sampling re-inspection on the quality of inspection lot, subitem projects, sub-subsection projects and subsection projects; and issue confirmation on whether the quality is qualified or not in written form according to the current relevant standards.
2.1.4 Site inspection
Inspection or examination on the strengthening materials, products, members and accessories, connection pieces, anchoring elements, instruments and equipments entering into the construction site according to the requirements of the relevant standards so as to issue confirmation on whether their quality is qualified or not
2.1.5 Repeat test
All the strengthening materials and products in relation to safety or function, no matter what kind of test certificates they are equipped, shall be carried out with evidential sampling inspection activities on the items stated in the current relevant standards and codes when approaching the construction site.
2.1.6 Lot
The product or material assembly composed of a certain amount of individuals (or bulk cargos) that are produced and constructed under uniform conditions or summarized according to the specified mode.
2.1.7 Inspection lot
The to-be-inspected lot designed for doing the sampling inspection (examination).
2.1.8 Evidential sampling
The field sampling process conducted by the professional personnel of construction organization or testing organization under the supervision of supervision organization or development organization (the owner).
The samples through evidential sampling shall be firstly signed and sealed by the supervisor and then be sent to be tested by the independent testing organization with corresponding qualification.
2.1.9 Dominant item
The inspection items playing a decisive role in the safety, sanitation, environmental protection and public interest of structure strengthening engineering.
2.1.10 General item
Inspection items except for the dominant items.
2.1.11 Existing structure member
The original (existing) member before strengthening.
2.1.12 Substrate
One of the adhered article coated with adhesive or other binding materials. It refers to the adhered existing structure member in structure strengthening engineering. If the existing structure member is made of composite material or combined material, then the substrate refers to the material of the adhered part.
2.2 Material Terms
2.2.1 Structural adhesives
It is the adhesive used for the cementing of bearing structural members to bear the design stress and enviromental effect for a long term. In civil works, due to the limitation of field conditions, the used structural adhesives mainly are the structural adhesives cured at room temperature.
2.2.2 Primer
It is a kind of adhesive cured at room temperature that is with good compatibility and adhesive capacity with the structural adhesives and substrate and is coated on the binding surface of substrate in advance so as to improve the cementing property and prevent the substrate surface from being contaminated or eroded after treatment.
2.2.3 Repairing adhesive for concrete crack
1 General Provision
2 Terms
2.1 General Terms
2.2 Material Terms
2.3 Construction Terms
3 Basic Requirement
4 Materials
4.1 Concrete Materials
4.2 Steels
4.3 Welding Materials
4.4 Structural Adhesives
4.5 Fiber Reinforced Polymers
4.6 Cements and Sands
4.7 Polymer Motar
4.8 Crack Repairs with Injections
4.9 Interfacial Adhesives for Concrete
4.10 Grouts for Structural Strengthening
4.11 Anchors
5 Strengthening with Enlarged Concrete Sections
5.1 General Requirement
5.2 Interface Treatment
5.3 Enlarge Concrete Section
5.4 Inspection of Construction Quality
6 Strengthening with Replaced RC Structural Elements
6.1 General Requirement
6.2 Real-time Control for Unloading
6.3 Local removal and Interface Treatment of Concrete
6.4 Replacement of Concrete
6.5 Inspection of Construction Quality
7 RC Elements Strengthened with Wrapped Wires
7.1 General Requirement
7.2 Interface Treatment
7.3 Wrapping with Wires
7.4 Inspection of Construction Quality
8 RC Member Strengthened by Externally Applied Prestress
8.1 General Requirement
8.2 Fabrication and Installation
8.3 Pre-stredding Tension
8.4 Inspection of Construction Quality
9 Strengthening by Externally Bonded or Wrapped Shaped Steel
9.1 General Requirement
9.2 Fabrication of Steel Skeleton
9.3 Surface Treatment
9.4 Installation and Welding of Steel Skeleton
9.5 Injection of Grouts
9.6 Inspection of Construction Quality
10 Strengthening by Externally Bonded Fiber Reinforced Polymers
10.1 General Requirement
10.2 Interface Treatment
10.3 Bonding of Fiber Reinforced Polymers
10.4 Inspection of Construction Quality
11 Strengthening by Bonding Steel Plates
11.1 General Requirement
11.2 Interface Treatment
11.3 Bonding of Steel Plates
11.4 Inspection of Construction Quality
12 Strengthening by Polymer motar Reinforced with Steel Wire Mesh
12.1 General Requirement
12.2 Interface Treatment
12.3 Installation of Steel Wire Mesh
12.4 Application of Polymer Motar
12.5 Inspection of Construction Quality
13 Strengthening Concrete or Masonry Members by Steel Bar Mesh and Motar Layer
13.1 General Requirement
13.2 Interface Treatment
13.3 Installation of Steel Bar Meshes and Construction of Motar Layers
13.4 Inspection of Construction Quality
14 Strengthening Masonry Columns with Prestressed Rods
14.1 General Requirement
14.2 Interface Treatment
14.3 Fabrication of Rods
14.4 Installation and Stress of Rods
14.5 Inspection of Construction Quality
15 Strengthening Steel Members with Enlarged Section
15.1 General Requirements
15.2 Interface Treatment
15.3 Fabrication of Steel Elements
15.4 Installation and Slicing Construction of Newly-added Steel Elements
15.5 Inspection of Construction Quality
16 Strengthening Welds in Steel Structures
16.1 General Requirement
16.2 Treatment of Welding Surface
16.3 Strengthening of Welding
16.4 Quality Inspection of Welding
17 Repair Cracks in Steel Structures
17.1 General Requirement
17.2 Strengthening of Welds and Quality Inspection
18 Repair Cracks in Concrete and Masonry Structures
18.1 General Requirement
18.2 Surface Treatment
18.3 Seal Crack Surfaces
18.4 Fill Cracks with Flexible Materials
18.5 Inject Cracks with Epoxy
18.6 Quality Inspection
19 Plant Rebars
19.1 General Requirement
19.2 Surface Treatment
19.3 Plant Rebars
19.4 Quality Inspection of Construction
20 Anchors
20.1 General Requirement
20.2 Installation of Anchors
20.3 Quality Inspection
21 Grouts
21.1 General Requirement
21.2 Safety Review of Construction Drawings
21.3 Surface Treatment
21.4 Application of Grouts
21.5 Quality Inspection
22 Acceptance of Building Structure Strengthening Engineering
Appendix A Division of Sub-subsection Projects and Subitem in Structural Strengthening Engineering
Appendix B Records of Quality Inspection
Appendix C Technical Specification for High-pressure Water Jet
Appendix D Sample Specification for Site Repeat Test of Materials or Products for Strengthening
Appendix E Specifications for Laboratory Test and Evaluation of Normal Tensile Bonding Strength between Strengthening Material and Substrate Bonded by Adhesive Material
Appendix F Specifications for Test and Evaluation of Debonding Performance of Structural Adhesives under T-Peel Impacts
Appendix G Test of Non-volatile Matter of Structural Adhesives
Appendix H Test of Durability Performance of Structural Adhesive under Circles of Wet and Heat
Appendix J Quick Test on Site of Durability Performance of Structural Adhesive under Circles of Wet and Heat
Appendix K Test Method of Initial Viscosity
Appendix L Determination of Thixotropic Index of Structural Adhesive
Appendix M Quick Determination of K Number of Carbon Fiber Reinforced Polymers
Appendix N Test Methods of Interface Shear Strength of Fiber Reinforced Polymers
Appendix P Test Method of Split Tensile Strength of Anchoring Type Structural Adhesives and Polymer Motar
Appendix Q Test Method of Flexural Strength of Motar and Grout for Structural Strengthening
Appendix R Test Method of Shear Strength under Tension of Polymer Motar and Composite Motar (Steel Sleeve Method)
Appendix S Test and Determination of Shear Bonding Strength of Structural Interfacial Adhesives (Agents)
Appendix T Sampling Rules and Determination on Site of Newly Added Concrete Strength
Appendix U Test and Determination of Normal Tensile Bonding Strength between Bonded Material and Substrate
Appendix V Provisions on Compressive Strength Determination for the Outer Added Mortar Surface Layer of Bearing Member with Rebounding Method
Appendix W On Site Test and Determination of Anchorage Capacity
Appendix Y Steel Bar Inhibitor Application Requirements
Explanation of Wording in This Code
List of Quoted Standards
1.0.1 This code is formulated with a view to reinforcing the quality management of building structure strengthening engineering, unifying the acceptance of construction quality of building structure strengthening engineering and to guaranteeing the engineering quality and security.
1.0.2 This code is applicable to the construction process control and construction quality acceptance of the strengthening engineering of concrete structure, masonry structure and steel structure.
1.0.3 The requirements on quality of strengthening engineering as specified in the technical documents and contract agreement of building structure strengthening engineering shall not be less than the requirements of this code.
1.0.4 This code shall be used together with the following current national standards:
1 “Unified Standard for Constructional Quality Acceptance of Building Engineering” (GB 50300);
2 “Code for Acceptance of Constructional Quality of Concrete Structures” (GB 50204);
3 “Code for Acceptance of Construction Quality of Masonry Engineering” (GB 50203);
4 “Code for Acceptance of Construction Quality of Steel Structures” (GB 50205).
1.0.5 The construction process control and construction quality acceptance of building structure strengthening engineering not only shall comply with this code and its supporting standards and codes, but also shall comply with those specified in the current relevant standards of the nation.
2 Terms
2.1 General Terms
2.1.1 Structure strengthening engineering
The bearing structures, members and their relevant portions with insufficient reliability are strengthened or with their internal force adjusted to make them be with adequate security and durability and to keep their applicability as much as possible.
2.1.2 Quality of structure strengthening engineering
It is the characteristic sum reflecting the structure strengthening engineering meets the requirements of current relevant standards or the requirements agreed in the contract, including all the obvious and implicit abilities of structure strengthening engineering in such aspects as the safety performance, endurance quality, functions of use and environmental protection.
2.1.3 Acceptance
Based on the inspection and evaluation on the quality of structure strengthening engineering of the construction organization, the organizations concerned participating in this engineering activity shall jointly carry out sampling re-inspection on the quality of inspection lot, subitem projects, sub-subsection projects and subsection projects; and issue confirmation on whether the quality is qualified or not in written form according to the current relevant standards.
2.1.4 Site inspection
Inspection or examination on the strengthening materials, products, members and accessories, connection pieces, anchoring elements, instruments and equipments entering into the construction site according to the requirements of the relevant standards so as to issue confirmation on whether their quality is qualified or not
2.1.5 Repeat test
All the strengthening materials and products in relation to safety or function, no matter what kind of test certificates they are equipped, shall be carried out with evidential sampling inspection activities on the items stated in the current relevant standards and codes when approaching the construction site.
2.1.6 Lot
The product or material assembly composed of a certain amount of individuals (or bulk cargos) that are produced and constructed under uniform conditions or summarized according to the specified mode.
2.1.7 Inspection lot
The to-be-inspected lot designed for doing the sampling inspection (examination).
2.1.8 Evidential sampling
The field sampling process conducted by the professional personnel of construction organization or testing organization under the supervision of supervision organization or development organization (the owner).
The samples through evidential sampling shall be firstly signed and sealed by the supervisor and then be sent to be tested by the independent testing organization with corresponding qualification.
2.1.9 Dominant item
The inspection items playing a decisive role in the safety, sanitation, environmental protection and public interest of structure strengthening engineering.
2.1.10 General item
Inspection items except for the dominant items.
2.1.11 Existing structure member
The original (existing) member before strengthening.
2.1.12 Substrate
One of the adhered article coated with adhesive or other binding materials. It refers to the adhered existing structure member in structure strengthening engineering. If the existing structure member is made of composite material or combined material, then the substrate refers to the material of the adhered part.
2.2 Material Terms
2.2.1 Structural adhesives
It is the adhesive used for the cementing of bearing structural members to bear the design stress and enviromental effect for a long term. In civil works, due to the limitation of field conditions, the used structural adhesives mainly are the structural adhesives cured at room temperature.
2.2.2 Primer
It is a kind of adhesive cured at room temperature that is with good compatibility and adhesive capacity with the structural adhesives and substrate and is coated on the binding surface of substrate in advance so as to improve the cementing property and prevent the substrate surface from being contaminated or eroded after treatment.
2.2.3 Repairing adhesive for concrete crack
Contents of GB 50550-2010
1 General Provision
2 Terms
2.1 General Terms
2.2 Material Terms
2.3 Construction Terms
3 Basic Requirement
4 Materials
4.1 Concrete Materials
4.2 Steels
4.3 Welding Materials
4.4 Structural Adhesives
4.5 Fiber Reinforced Polymers
4.6 Cements and Sands
4.7 Polymer Motar
4.8 Crack Repairs with Injections
4.9 Interfacial Adhesives for Concrete
4.10 Grouts for Structural Strengthening
4.11 Anchors
5 Strengthening with Enlarged Concrete Sections
5.1 General Requirement
5.2 Interface Treatment
5.3 Enlarge Concrete Section
5.4 Inspection of Construction Quality
6 Strengthening with Replaced RC Structural Elements
6.1 General Requirement
6.2 Real-time Control for Unloading
6.3 Local removal and Interface Treatment of Concrete
6.4 Replacement of Concrete
6.5 Inspection of Construction Quality
7 RC Elements Strengthened with Wrapped Wires
7.1 General Requirement
7.2 Interface Treatment
7.3 Wrapping with Wires
7.4 Inspection of Construction Quality
8 RC Member Strengthened by Externally Applied Prestress
8.1 General Requirement
8.2 Fabrication and Installation
8.3 Pre-stredding Tension
8.4 Inspection of Construction Quality
9 Strengthening by Externally Bonded or Wrapped Shaped Steel
9.1 General Requirement
9.2 Fabrication of Steel Skeleton
9.3 Surface Treatment
9.4 Installation and Welding of Steel Skeleton
9.5 Injection of Grouts
9.6 Inspection of Construction Quality
10 Strengthening by Externally Bonded Fiber Reinforced Polymers
10.1 General Requirement
10.2 Interface Treatment
10.3 Bonding of Fiber Reinforced Polymers
10.4 Inspection of Construction Quality
11 Strengthening by Bonding Steel Plates
11.1 General Requirement
11.2 Interface Treatment
11.3 Bonding of Steel Plates
11.4 Inspection of Construction Quality
12 Strengthening by Polymer motar Reinforced with Steel Wire Mesh
12.1 General Requirement
12.2 Interface Treatment
12.3 Installation of Steel Wire Mesh
12.4 Application of Polymer Motar
12.5 Inspection of Construction Quality
13 Strengthening Concrete or Masonry Members by Steel Bar Mesh and Motar Layer
13.1 General Requirement
13.2 Interface Treatment
13.3 Installation of Steel Bar Meshes and Construction of Motar Layers
13.4 Inspection of Construction Quality
14 Strengthening Masonry Columns with Prestressed Rods
14.1 General Requirement
14.2 Interface Treatment
14.3 Fabrication of Rods
14.4 Installation and Stress of Rods
14.5 Inspection of Construction Quality
15 Strengthening Steel Members with Enlarged Section
15.1 General Requirements
15.2 Interface Treatment
15.3 Fabrication of Steel Elements
15.4 Installation and Slicing Construction of Newly-added Steel Elements
15.5 Inspection of Construction Quality
16 Strengthening Welds in Steel Structures
16.1 General Requirement
16.2 Treatment of Welding Surface
16.3 Strengthening of Welding
16.4 Quality Inspection of Welding
17 Repair Cracks in Steel Structures
17.1 General Requirement
17.2 Strengthening of Welds and Quality Inspection
18 Repair Cracks in Concrete and Masonry Structures
18.1 General Requirement
18.2 Surface Treatment
18.3 Seal Crack Surfaces
18.4 Fill Cracks with Flexible Materials
18.5 Inject Cracks with Epoxy
18.6 Quality Inspection
19 Plant Rebars
19.1 General Requirement
19.2 Surface Treatment
19.3 Plant Rebars
19.4 Quality Inspection of Construction
20 Anchors
20.1 General Requirement
20.2 Installation of Anchors
20.3 Quality Inspection
21 Grouts
21.1 General Requirement
21.2 Safety Review of Construction Drawings
21.3 Surface Treatment
21.4 Application of Grouts
21.5 Quality Inspection
22 Acceptance of Building Structure Strengthening Engineering
Appendix A Division of Sub-subsection Projects and Subitem in Structural Strengthening Engineering
Appendix B Records of Quality Inspection
Appendix C Technical Specification for High-pressure Water Jet
Appendix D Sample Specification for Site Repeat Test of Materials or Products for Strengthening
Appendix E Specifications for Laboratory Test and Evaluation of Normal Tensile Bonding Strength between Strengthening Material and Substrate Bonded by Adhesive Material
Appendix F Specifications for Test and Evaluation of Debonding Performance of Structural Adhesives under T-Peel Impacts
Appendix G Test of Non-volatile Matter of Structural Adhesives
Appendix H Test of Durability Performance of Structural Adhesive under Circles of Wet and Heat
Appendix J Quick Test on Site of Durability Performance of Structural Adhesive under Circles of Wet and Heat
Appendix K Test Method of Initial Viscosity
Appendix L Determination of Thixotropic Index of Structural Adhesive
Appendix M Quick Determination of K Number of Carbon Fiber Reinforced Polymers
Appendix N Test Methods of Interface Shear Strength of Fiber Reinforced Polymers
Appendix P Test Method of Split Tensile Strength of Anchoring Type Structural Adhesives and Polymer Motar
Appendix Q Test Method of Flexural Strength of Motar and Grout for Structural Strengthening
Appendix R Test Method of Shear Strength under Tension of Polymer Motar and Composite Motar (Steel Sleeve Method)
Appendix S Test and Determination of Shear Bonding Strength of Structural Interfacial Adhesives (Agents)
Appendix T Sampling Rules and Determination on Site of Newly Added Concrete Strength
Appendix U Test and Determination of Normal Tensile Bonding Strength between Bonded Material and Substrate
Appendix V Provisions on Compressive Strength Determination for the Outer Added Mortar Surface Layer of Bearing Member with Rebounding Method
Appendix W On Site Test and Determination of Anchorage Capacity
Appendix Y Steel Bar Inhibitor Application Requirements
Explanation of Wording in This Code
List of Quoted Standards
