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GB 50728-2011: Technical code for safety appraisal of engineering structural strengthening materials Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB 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 ContentsForeword... 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... 1431 General provisions1.0.1 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 Terms2.0.1 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 requirements3.0.1 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 adhesives4.1 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 cracks5.1 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 strengthening6.1 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 polymer8.1 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 ropes9.1 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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