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GB 50204-2015: Code for quality acceptance of concrete structure construction Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB 50204: Historical versions
Similar standardsGB 50204-2015: Code for quality acceptance of concrete structure construction---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/GB50204-2015UDC GB NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA P GB 50204-2015 Code for Quality Acceptance of Concrete Structure Construction Issued on. DECEMBER 31, 2014 Implemented on. SEPTEMBER 1, 2015 Jointly issued by. Ministry of Housing and Urban-Rural Development; General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China. NATIONAL STANDARD OF THE PEOPLE'S REPUBLIC OF CHINA Code for Quality Acceptance of Concrete Structure Construction Developed by. Ministry of Housing and Urban-Rural Development of the People's Republic of China Approved by. Ministry of Housing and Urban-Rural Development of the People's Republic of China Implementation date. September 1, 2015 China Architecture and Building Press Beijing, 2014 Table of ContentsForeword... 6 1 General Provisions... 8 2 Terms... 8 3 Basic Requirements... 9 4 Formwork Subitem Project... 10 5 Steel Bar Subitem Project... 14 6 Prestressed Subitem Project... 21 7 Concrete Subitem Project... 27 8 Cast-in-situ Structure Subitem Project... 31 9 Precast Structure Subitem Project... 36 10 Concrete Structures Sub-subsection Project... 41 Appendix A Records on Quality Acceptance... 44 Appendix B Inspection of Structural Performance of Flexural Precast Members... 47 B.1 Inspection Requirements... 47 B.2 Inspection Method... 50 Appendix C Strength Inspection of Test Piece Cured at the Same Condition of Concrete Structure Entity... 54 Appendix D Inspection on Concrete Strength of Structure Entity with Rebound and Core-drilling Method... 55 Appendix E Inspection on Protective Layer Thickness of Steel Bar of Structure Entity... 57 Appendix F Inspection on Positional and Dimensional Deviation of Structure Entity... 59 Wording Explanation in This Code... 61 List of Quoted Standards... 621 General Provisions1.0.1 This code is developed in order to strengthen the construction engineering quality management, unify acceptance of concrete structure engineering construction quality and guarantee project construction quality. 1.0.2 This code is applicable to construction quality acceptance of concrete structure. 1.0.3 Quality acceptance of concrete structure construction shall not only comply with those specified in this code, but also comply with those in the current relevant national standards.2 Terms2.0.1 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 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 is made by assembling and connecting the precast concrete members or parts, hereinafter referred to as precast structure. 2.0.7 Inspection Activity in which the features and performances of the inspected item are determined, inspected and tested, and the results are compared with the requirements specified in standards so as to verify the acceptance of each performance. 2.0.8 Inspection lot The inspection body summarized according to the same production conditions or provisions for the sampling inspection and comprising of certain quantity of samples.3 Basic Requirements3.0.1 Concrete structure, as sub-subsection project, may be classified into subitem projects of formwork, steel bar, prestress, concrete, cast-in-situ structure and precast structure. Each subitem project may be classified into several inspection lots according to approaching lots, shift, storey, structural joint or construction section in the principle of consistence with production and construction mode and being convenient for construction quality control. 3.0.5 The sampling shall be carried out randomly in inspection lot and distributed evenly and typically. 3.0.6 Treatment of ineligible inspection lot shall meet the following requirements. 3.0.7 The certified products or the products with stable source and which are eligible upon inspection only once in continuous three lots may be allowed to expand to be double of the capacity of inspection lot at site inspection according to the relevant requirements of this code and the capacity can be doubled only. 3.0.8 Materials, members and accessories, appliance and semi-finished products applied in concrete structure engineering shall be inspected according to the lot number on site.4 Formwork Subitem Project4.1 General Requirements 4.1.1 Formwork shall be prepared with a construction scheme. Technology demonstration shall be carried out for the special construction schemes of creeping formwork, tool-type formwork and tall formwork support. 4.2 Formwork Installation Dominant items 4.2.1 Technical index of formwork and support materials shall comply with the requirements of current relevant standards of the Nation. The formwork and support materials shall be sampled for inspection over the appearance, specification and dimension when entering into the site. 4.2.3 Formwork and support of post-cast strip shall be arranged separately. Inspection quantity. 100% inspection. Inspection method. observing. 4.2.5 Formwork installation shall meet the following requirements. 4.2.6 Release agent shall comply with the construction scheme in the variety and application methods and it shall not influence the structural performance and decoration construction or contaminate the joints where steel bar, prestressed bar are embedded parts are concreted or pollute the environment.5 Steel Bar Subitem Project5.1 General Requirement 5.1.1 Acceptance of concealed work shall be performed before concreting, covering. 5.2 Materials Dominant Items 5.2.1 Where steel bars approach the site, test pieces shall be sampled for yield strength, tensile strength, elongation percentage, bending properties and weight deviation according to relevant current standards of the nation, and inspection results shall meet those specified in corresponding standards. 5.2.2 Where fabricated steel bars approach the site, test pieces shall be sampled for yield strength, tensile strength, elongation percentage and weight deviation and inspection results shall meet the requirements of current relevant standards of the Nation. As for the fabricated steel bars made of hot-rolled steel bar, only weight deviation inspection may be carried out when the representatives of constructor or supervisor monitor the production on the site and provide third party inspection reports of mechanical performance for raw material steel bar. 5.3 Steel Bar Processing Dominant Items 5.3.1 Inside diameter of arc of bent steel bar shall meet the following requirements. 5.3.3 The terminal of stirrup and lacing bar shall be made into hooks according to the design requirements and the following requirements. 5.3.4 Coil steel bar, after being straightened, shall be subjected to mechanical performance and weight deviation inspection and its strength shall comply with the requirements of current relevant standards of the Nation and its percentage elongation after fracture and weight deviation shall be in accordance with those specified in Table 5.3.4. 5.4.4 The position of steel bar joints shall meet design and construction scheme requirements. As for structures provided with seismic fortification requirements, splicing of steel bars shall not be carried out within the scope of beam end, column end and stirrup densified area. The distance from the joint terminal to the bending starting-point of the steel bar shall not be less than 10 times the steel bar diameter.6 Prestressed Subitem Project6.1 General Requirements 6.1.1 Prestressed concealed project acceptance shall be performed before concreting, covering. 6.1.3 Prestressing machine and pressure gauge for prestressed tendon shall be subjected to regular maintenance, both of which shall be accompanied with calibration and application, and the calibration period shall not exceed half a year. 6.2 Materials Dominant Items 6.2.1 Where prestressed tendons approach the site, test pieces shall be sampled for tensile strength and elongation inspection according to relevant current standards of the nation, and inspection results shall meet those specified in corresponding standards. Inspection quantity. determine according to the delivered batch and product sampling inspection scheme. 6.2.4 The anchorage system for unbonded prestressed tendon under Class IIIa and Class IIIb environmental conditions shall be subjected to waterproof performance inspection according to the relevant requirements of the current professional standard JGJ 92 Technical Specification for Concrete Structures Prestressed with Unbonded Tendons, and the inspection result shall meet those specified in the said standard. 6.3 Fabrication and Installation Dominant Items 6.3.1 Variety, specification, grade and quantity of prestressed tendons to be installed must meet the design requirements. 6.4 Tensioning and Extending Dominant Items 6.4.1 Member concrete strength shall be inspected before tensioning or extending or prestressed tendons. The compressive strength of concrete cube test piece cured under the same condition shall meet the design requirements, otherwise, the following requirements shall be met.7 Concrete Subitem Project7.1 General Requirements 7.1.1 Concrete strength shall be subjected to inspection and evaluation by lots according to the requirements of the current national standard GB/T 50107 Standard for Evaluation of Concrete Compressive Strength. As for the concrete in the same inspection lot, the construction duration should not exceed 3 months. 7.1.3 Where the strength of concrete test piece fails to pass the evaluation, qualified testing organization shall be entrusted to test and estimate the strength of concrete in structural members according to the requirements of relevant current standards of the nation as well as process according to those specified in 10.2.2 of this code. 7.2 Raw Materials Dominant Items 7.2.1 Variety, code number, strength grade, packaging or bulking No. and delivery date of cement in case of approaching the site shall be checked and strength, stability and setting time of such cement shall also be inspected, for which the inspection result shall meet the relevant requirements of the current national standard GB 175 Common Portland Cement. 7.2.4 Quality of coarse aggregate and fine aggregate in concrete materials shall meet the requirements of the current professional standard JGJ 52 Standard for Technical Requirements and Test Method of Sand and Crushed Stone (or Gravel) for Ordinary Concrete, sea sand having been purified shall meet the requirements of the current professional standard JGJ 206 Technical Code for Application of Sea sand Concrete, and reclaimed concrete aggregate shall meet the requirements of the current national standard GB/T 25177 Recycled Coarse 7.3 Concrete Mixtures Dominant Items 7.3.1 Quality of ready-mixed concrete in case of approaching the site shall meet the requirements of the current national standard GB/T 14902 Ready-mixed Concrete. Inspection quantity. 100% inspection. Inspection method. inspecting the quality certificate document.8 Cast-in-situ Structure Subitem Project8.1 General Requirements 8.1.1 Quality acceptance of the cast-in-situ structure shall meet the following requirements. 8.2 Appearance Quality Dominant Items 8.2.1 The appearance quality of cast-in-situ structure shall be free from serious defects. Serious defects having been caused shall be provided with technical processing scheme by the construction unit and processed after the scheme is approved by the supervising unit; the technical processing scheme for crack or serious defect at connecting position and other serious defects influencing structural safety shall also be approved by the design unit. Positions processed shall be accepted again.9 Precast Structure Subitem Project9.1 General Requirements 9.1.1 Acceptance of concealed work shall be carried out before pouring concrete on the connecting part of precast structure and composite member. Acceptance of concealed work shall include the following main content. 9.1.2 The joint construction quality and waterproof performance of precast structure shall meet the design requirements and the requirements of current relevant standards of the Nation. 9.2 Precast Members Dominant Items 9.2.1 The quality of precast members shall meet those specified in this code, the requirements of current relevant standards of the Nation and the design requirements. Inspection quantity. 100% inspection. Inspection method. inspecting quality certificate documents or quality acceptance record. 9.2.5 Precast members shall be provided with markings. Inspection quantity. 100% inspection. Inspection method. observing. 9.2.6 The appearance quality of precast members shall be free from common defects. Inspection quantity. 100% inspection. Inspection method. observing, inspecting the treatment record. 9.2.7 The dimensional deviation and inspection method of precast members shall meet those specified in Table 9.2.7.Where there are design requirements, the design requirements shall be met with. In the construction process, the permissible deviation of the center line position of embedment parts used temporarily may take two times of the value specified in Table 9.3.8 After construction, the appearance quality of precast structure shall be free from common defect. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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