GB 50728-2011 PDF English
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| GB 50728-2011 | English | 605 |
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Technical code for safety appraisal of engineering structural strengthening materials
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GB 50728-2011: Technical code for safety appraisal of engineering structural strengthening materials
---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/GB50728-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
Technical code for safety appraisal of
engineering structural strengthening materials
Issued on. DECEMBER 5, 2011
Implemented on. MAY 1, 2012
Jointly issued by. Ministry of Housing and Urban-Rural Development of
the People’s Republic of China;
General Administration of Quality Supervision,
Inspection and Quarantine of the People’s Republic of
China.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Technical code for safety appraisal of
engineering structural strengthening materials
Chief development department. Sichuan Provincial Department of Housing and
Urban-Rural Development
Approval department. Ministry of Housing and Urban-Rural Development of the
People’s Republic of China
Implementation date. May 1, 2012
2011 Beijing
Ministry of Housing and Urban-Rural
Development of the People’s Republic of China
Table of Contents
Foreword... 4
1 General provisions... 10
2 Terms... 11
3 Basic requirements... 15
4 Structural adhesives... 18
5 Injection grouting for cracks... 40
6 Cement-based grouting material for structural strengthening... 44
7 Polymer modified cement mortar for structural strengthening... 47
8 Fibre reinforced polymer... 50
9 Steel wire ropes... 54
10 Synthetics modified concrete and mortar... 56
11 Steel fibre reinforced concrete... 59
12 Post-installed fastenings... 61
Annex A Suitable test method standards for safety appraisal... 64
Annex B Calculation method for characteristic value of material properties.. 67
Annex C Quick determination of wedge for bond durability... 68
Annex D Determination method for interlaminar shear strength of
fibre reinforced polymer... 74
Annex E Determination method for splitting tensile strength of filler-rich
adhesive colloid and polymer modified cement mortar... 80
Annex F Determination method and evaluation criteria for T impact peeling
length of structural adhesive... 84
Annex G Laboratory determination method and evaluation criteria for
tensile bond strength of adhesive material agglutinate strengthening
material and substrate... 89
Annex H Determination method of non-volatile matter
content in structural adhesive... 97
Annex J Determination method for damp heat ageing of structural adhesive
and polymer modified cement mortar [Translator Note. Annex I is not existed]
... 100
Annex K Determination method for bond strength of adhesive agglutinate
steel bar and concrete substrate in pull-out constraint condition... 104
Annex L Determination method for heat ageing resistance of structural
adhesive... 109
Annex M Determination method for fatigue stress resistance ability of
specimens connected with adhesive... 113
Annex N Determination method and evaluation criteria for compressive shear
strength of concrete-to-concrete bonding... 116
Annex P Determination method for shrinkage of adhesive casting (colloid). 122
Annex Q Determination method for initial viscosity of structural adhesive... 125
Annex R Determination method for thixotropic index of structural adhesive 129
Annex S Determination method for flexural strength of polymer modified
cement mortar and grouting material... 132
Annex T Determination method for flexural toughness of
synthetics modified concrete... 136
Annex U Test method of anchorage capacity... 139
Explanation of wording in this Code... 142
List of quoted standards... 143
1 General provisions
1.0.1 This Code is formulated with a view of strengthening the quality control
and technical management of relevant materials and products used in the
engineering structural strengthening to ensure the quality and safety of the
engineering structural strengthening projects.
1.0.2 This Code is applicable to the safety inspection and appraisal of
materials and products used in structure strengthening engineering.
1.0.3 The conclusions on the safety appraisal of application of engineering
structural strengthening materials and products shall be taken as the basis for
the selection of materials for engineering strengthening, and shall not be used
for replacing the sampling of strengthening materials and products at the
construction site for re-inspection.
1.0.4 The safety appraisal of application of engineering structural
strengthening materials and products shall be accepted by the inspection and
appraisal institutions with corresponding qualifications approved by the
competent authorities of the nation.
1.0.5 This Code shall be used in conjunction with the following current
national standards, namely GB 50367 Code for design of strengthening
concrete structure, GB 50702 Code for design of strengthening masonry
structures, GB 50550 Code for acceptance of constructional quality of
strengthening building structures, etc.
1.0.6 Not only the requirements stipulated in this Code, but also those in the
current relevant standards of the nation shall be complied with, during the safety
inspection and appraisal of application of engineering structural strengthening
materials and products.
2 Terms
2.0.1 Appraisal
A set of work activities carried out for demonstrating the reliability (including the
safety, suitability and durability) of a strengthening material or product in
involvement of load-bearing members of engineering structure under stress.
2.0.2 Verification test
A test to prove whether the properties of a strengthening material or product
meet the specified requirements.
2.0.3 Sampling
The process of randomly selecting or composing samples according to certain
rules.
2.0.6 Substrate
In the bonding engineering, both strengthening member and existing structure
member are adherents. However, the two are different in properties. For ease
of differentiation, the existing structure member or the portion to be adhered
thereto is referred to as a substrate.
2.0.7 Structural adhesive
An adhesive that is used for bonding of load-bearing structures or members
and is able to withstand long-term design stress and environmental effects,
referred to as structural adhesive.
2.0.8 Primer
An adhesive used for surface treatment of reinforced members (substrates), for
preventing surface contamination and improving surface adhesion.
2.0.12 Room temperature curing
For unmodified structural adhesives, it refers to the curing process that enables
normal chemical reactions at room temperature of not less than 15°C. For
modified structural adhesives, it refers to the curing process that enables
normal chemical reactions at room temperature of not less than 5°C.
2.0.18 Fibre reinforced polymer
Composite materials prepared using specially treated high strength or high
modulus continuous fibres arranged in accordance with certain rules, with the
fibre-reinforced effect.
2.0.19 Fibre concrete
Composite materials prepared by mixing staple fibres distributed evenly in
irregular directions in cement-based concrete. When mainly used for improving
the strength of concrete, it is called fibre-reinforced concrete. When mainly used
for improving the crack resistance or toughness of concrete, it is generally
called fibre modified concrete.
2.0.20 Stainless-steel fibre reinforced concrete
It refers only to the stainless-steel staple fibre produced by melt extraction,
mixed with nickel and chromium components. It is suitable for concrete or
mortar layer strengthening, and is generally applied to important structures with
strict requirements for corrosion protection and heat resistance.
3 Basic requirements
3.0.1 Any engineering structural strengthening materials and products
involved in engineering safety must pass the safety appraisal according
to the requirements of this Code.
3.0.2 The strengthening materials or products applying for safety appraisal
shall meet the following conditions.
3.0.3 The sampling for safety appraisal of strengthening materials or products
shall meet the following requirements.
3.0.6 The characteristic value of the properties of engineering structural
strengthening material shall be calculated according to the requirements of
Annex B in this Code. The confidence level of calculation, γ, shall meet the
following requirements.
3.0.7 For the structural strengthening materials or products passing the safety
appraisal, the safety appraisal report shall be submitted. The inspection report
attached to the appraisal report shall specify the sampling rules, sampling
objects, sampling methods and time used in the inspection.
4 Structural adhesives
4.1 General requirements
4.1.1 The structural adhesives for strengthening of engineering structures
shall be divided into adhesive for concrete, adhesive for structural steel,
adhesive for masonry and adhesive for timber, according to different adhesive
substrates.
4.1.2 The highest service temperature category of room temperature curing
structural adhesives shall be indicated in the manual, according to the following
requirements. The corresponding conformity assessment criteria are set out in
the sections of this chapter.
4.2 Structural adhesive for concrete substrates
4.2.1 During safety appraisal of the structural adhesives using concrete
structural members as the substrates for steel, fibre reinforced polymer and
anchor bonding, and the primer and putty that need to be used in conjunction
with the structural adhesives, the requirements of this section shall apply.
4.2.4 The safety appraisal of low temperature curing structural adhesives for
concrete substrates shall meet the following requirements.
4.3 Structural adhesive for masonry substrates
4.3.1 For composite masonry members whose surface layers are made of
reinforced concrete, the safety appraisal of structural adhesives for
strengthening shall meet the requirements of the structural adhesives for
concrete substrates.
4.4 Structural adhesive for steel substrates
4.4.1 During safety appraisal of the structural adhesives using steel structural
members as the substrates for bonding strengthening materials, and the primer
and putty used in conjunction with the structural adhesives, the requirements of
this section shall apply.
4.8 Technical property requirements for engineering safety of
structural adhesives
4.8.1 The technical properties with regard to engineering safety of structural
adhesives shall also be used as an integral part of safety appraisal for
inspection and appraisal. The test items and acceptable indices of Class I
adhesives shall meet the requirements of Table 4.8.1.
5 Injection grouting for cracks
5.1 General requirements
5.1.1 The injection grouting for sealing and filling concrete and masonry
cracks shall be divided into modified epoxy-based injection grouting and
modified cement-based injection grouting, in accordance with different bonding
materials in use.
5.1.2 The design working life of the injection grouting for cracks in compliance
with the safety requirements of this Code shall meet the following requirements.
5.2 Safety appraisal of injection grouting for cracks
5.2.1 The test items and acceptable indices for safety appraisal of modified
epoxy-based injection grouting for cracks shall meet the requirements of Table
5.2.1.
5.2.3 In addition to the safety requirements of Table 5.2.2, the properties of
modified cement-based injection grouting used in high-temperature
environments shall also meet the requirements for heat resistance specified in
Table 5.2.3.
6 Cement-based grouting material for structural strengthening
6.1 General requirements
6.1.1 During safety appraisal of cement-based grouting material for structural
strengthening, the requirements of this chapter shall apply.
6.2 Safety appraisal of cement-based grouting material
6.2.1 The test items and acceptable indices for safety appraisal of cement-
based grouting material for engineering structural strengthening shall meet the
requirements of Table 6.2.1-1 and Table 6.2.1-2.
8 Fibre reinforced polymer
8.1 General requirements
8.1.1 Fibre reinforced polymers for engineering structural strengthening
include the carbon fibre reinforced polymer, glass fibre reinforced polymer and
aramid fibre reinforced polymer.
8.1.2 The fibres of the fibre reinforced polymer must be continuous fibres; the
way in which they are forced must be designed to withstand only tensile stress.
8.2 Carbon fibre reinforced polymer
8.2.1 For carbon fibres for the strengthening of load-carrying structures,
the material variety and specifications must meet the following
requirements.
8.2.2 Carbon fibre reinforced polymer is divided into Grade I, Grade II and
Grade III according to its properties. During safety appraisal, the inspection
shall be carried out according to the grade reported by the entrusting party.
8.2.4 The test items and acceptable indices for safety appraisal of
carbon fibre reinforced polymer shall meet the requirements of Table 8.2.4.
8.3 Aramid fibre reinforced polymer
8.3.1 For aramid fibres for the load-carrying structures, the variety shall meet
the following requirements.
8.4.2 The test items and acceptable indices for safety appraisal of glass
fibre reinforced polymer shall meet the requirements of Table 8.4.2.
9 Steel wire ropes
9.1 General requirements
9.1.1 During the steel wire production of steel wire ropes for structural
strengthening and the safety appraisal of steel wire ropes, the requirements of
this chapter shall apply.
9.2 Steel wire for rope making
9.2.1 When using high-strength stainless wires for rope making, high-quality
stainless-steel with a carbon content of not greater than 0.15%, a sulfur content
of not greater than 0.025% and a phosphorus content of not greater than 0.035%
shall be used for rope making.
9.3 Safety appraisal of steel wire ropes
9.3.1 The test items and acceptable indices for safety appraisal of steel
wire ropes for structures shall meet the requirements of Table 9.3.1.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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