GB 50164-2011 English PDF

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GB 50164-1992	959	Add to Cart	6 days	Standard of quality control of concrete	Obsolete

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Basic data

Standard ID: GB 50164-2011 (GB50164-2011)
Description (Translated English): Standard for quality control of concrete
Sector / Industry: National Standard
Classification of Chinese Standard: Q13
Classification of International Standard: 91.100.30
Word Count Estimation: 63,622
Date of Issue: 2011-04-02
Date of Implementation: 2012-05-01
Older Standard (superseded by this standard): GB 50164-1992
Quoted Standard: GB/T 50080; GB/T 50081; GB/T 50082; GB/T 50107; GB 50119; GB 50204; GB 175; GB 200; GB/T 1596; GB 6566; GB 8076; GB/T 9142; GB/T 10171; GB/T 18046; GB/T 20491; GB 23439; JGJ/T 10; JGJ 52; JGJ 55; JGJ 63; JGJ/T 193; JGJ 206; JTJ 270; JC 475
Regulation (derived from): Bulletin of the Ministry of Housing and Urban No. 969
Issuing agency(ies): 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
Summary: This Chinese standard applies to ordinary concrete construction quality control.

GB 50164-2011: Standard for quality control of concrete

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
1 General 1.0.1 This standard is formulated in order to strengthen the quality control of concrete, promote the progress of concrete technology, and ensure the quality of concrete engineering. 1.0.2 This standard applies to the quality control of ordinary concrete in construction projects. 1.0.3 Concrete quality control shall not only comply with the provisions of this standard, but also comply with the relevant current national standards. 2 Raw material quality control 2.1 Cement 2.1.1 The selection of cement varieties and strength grades should be determined according to the design, construction requirements and the environment in which the project is located. For ordinary concrete in general building structures and prefabricated components, general-purpose Portland cement should be used; high-strength concrete and concrete with frost resistance requirements should use Portland cement or ordinary Portland cement; there is a requirement to prevent concrete alkali-aggregate reaction For concrete projects, cement with an alkali content of less than 0.6% should be used; for large-volume concrete, medium- and low-heat Portland cement or low-heat slag Portland cement should be used. The cement should meet the relevant provisions of the current national standard "General Portland Cement" GB 175 and "Medium Heat Portland Cement, Low Heat Portland Cement, Low Heat Slag Portland Cement" GB 200. 2.1.2 The main control items of cement quality should include setting time, stability, mortar strength, magnesium oxide and chloride ion content, and the main control items of cement with alkali content less than 0.6% should also include alkali content, medium and low heat silicate The main control items of cement or low-heat slag Portland cement should also include the heat of hydration. 2.1.3 The application of cement shall comply with the following regulations. 1 The cement produced by the new dry process kiln should be used. 2 The type and amount of the admixture in the cement should be indicated. 3 The temperature of cement used to produce concrete should not be higher than 60°C. 2.2 Coarse aggregate 2.2.1 Coarse aggregate should meet the requirements of JGJ 52, the current industry standard "Sand and Stone Quality and Inspection Method Standard for Ordinary Concrete". 2.2.2 The main control items of coarse aggregate quality should include particle gradation, needle flake particle content, mud content, mud block content, crushing value index and firmness, and the main control items of coarse aggregate used for high-strength concrete are also Rock compressive strength should be included. 2.2.3 The application of coarse aggregate shall meet the following requirements. 1 Concrete coarse aggregate should adopt continuous gradation. 2 For concrete structures, the maximum nominal particle size of coarse aggregate shall not be greater than 1/4 of the minimum cross-sectional size of the member, and shall not be greater than 3/4 of the minimum clear spacing of steel bars; for concrete solid slabs, the maximum nominal particle size of aggregates should not be greater than 1/3 of the thickness, and shall not be greater than 40mm; for mass concrete, the maximum nominal particle size of coarse aggregate should not be less than 31.5mm. 3 For concrete with impermeability, frost resistance, corrosion resistance, wear resistance or other special requirements, the mud content and mud block content in the coarse aggregate shall not exceed 1.0% and 0.5% respectively; Should be greater than 8%. 2.4.3 The application of mineral admixtures shall comply with the following regulations. 1 Portland cement and ordinary Portland cement should be used for concrete mixed with mineral admixtures. 2 When mineral admixtures are used in concrete, the type and amount of mineral admixtures shall be determined through tests. 3 Mineral admixture should be used together with superplasticizer. 4 For high-strength concrete or concrete with other special requirements such as impermeability, frost resistance, corrosion resistance, wear resistance, etc., fly ash lower than Class II should not be used. 5 For high-strength concrete and concrete with corrosion resistance requirements, when silica fume is required, silica fume with a silica content of less than 90% should not be used. 2.5 Admixtures 2.5.1 Admixtures should meet the relevant provisions of the current national standards "Concrete Admixtures" GB 8076, "Concrete Antifreeze" JC 475 and "Concrete Expansive Agents" GB 23439. 2.5.2 The main control items of admixture quality should include two aspects of concrete performance and admixture homogeneity, the main control items of concrete performance should include water reducing rate, setting time difference and compressive strength ratio, admixture homogeneity The main control items in terms of property should include pH value, chloride ion content and alkali content; the main control items of air-entraining agent and air-entraining superplasticizer should also include air content; the main control items of antifreeze should also include air content and 50 times of freezing Melt strength loss rate ratio; expansion agent main control items should also include setting time, limited expansion rate and compressive strength. 2.5.3 The application of admixtures shall comply with the relevant provisions of the current national standard "Technical Specifications for the Application of Concrete Admixtures" GB 50119, and shall also comply with the following provisions. 1 When admixtures are used in concrete, the admixtures should have good adaptability to cement, and their types and dosages should be determined through tests. 2 High-performance water reducer should be used for high-strength concrete; air-entraining agent or air-entraining water reducer should be used for concrete with antifreeze requirements; retarder or retarder water reducer should be used for large-volume concrete; antifreeze can be used for concrete winter construction agent. 3 The chloride ion content and alkali content in the admixture should meet the concrete design requirements. 4 Liquid admixture should be used. 2.6 water 2.6.1 Concrete water should comply with the relevant provisions of the current industry standard "Concrete Water Standard" JGJ 63. 2.6.2 The main control items for concrete water should include pH value, insoluble matter content, soluble matter content, sulfate ion content, chloride ion content, cement setting time difference and cement mortar strength ratio; when the concrete aggregate is alkali active, The main control items should also include alkali content. 2.6.3 The application of water for concrete shall meet the following requirements; 1 Untreated seawater is strictly forbidden to be used in reinforced concrete and prestressed concrete. 2 When the aggregate has alkali activity, the concrete water shall not use the washing water of the production equipment of the concrete enterprise.

3 Performance requirements of concrete

3.1 Mixture properties 3.1.1 The performance of the concrete mixture should meet the design and construction requirements. The performance test method of concrete mixtures shall comply with the relevant provisions of the current national standard "General Concrete Mixture Performance Test Method Standard" GB/T 50080; the test method of slump loss over time shall comply with the provisions of Appendix A of this standard. 3.1.2 The consistency of concrete mixture can be expressed by slump, Weibo consistency or expansion. The slump test is suitable for concrete mixtures with a slump not less than 10mm, the Weibo consistency test is suitable for concrete mixtures with a Weibo consistency of 5s to 30s, and the expansion is suitable for pumping high-strength concrete and self-compacting concrete. The grading of slump, Vibe consistency and expansion and their consistency tolerances shall comply with the provisions in Table 3.1.2-1, Table 3.1.2-2, Table 3.1.2-3 and Table 3.1.2-4 respectively. Table 3.1.2-1 Classification of slump of concrete mixture Table 3.1.2-2 Weber Consistency Classification of Concrete Mixtures Table 3.1.2-3 Classification of expansion degree of concrete mixture Table 3.1.2-4 Allowable Deviation of Concrete Mixture Consistency 3.1.3 On the premise of meeting the construction requirements, the concrete mixture should adopt a smaller slump as possible; the design value of the slump of the pumped concrete mixture should not be greater than 180mm. 3.1.4 The expansion degree of pumped high-strength concrete should not be less than 500mm; the expansion degree of self-compacting concrete should not be less than 600mm. 3.1.5 The slump loss of concrete mixture over time should not affect the normal construction of concrete. The slump loss of the pumped concrete mixture over time should not be greater than 30mm/h. 3.1.6 The concrete mixture shall have good workability and shall not segregate or bleed. 3.1.7 The setting time of the concrete mixture shall meet the construction requirements and concrete performance requirements. 3.1.8 The maximum content of water-soluble chloride ions in the concrete mixture shall meet the requirements in Table 3.1.8.The content of water-soluble chloride ions in concrete mixtures should be determined according to the current industry standard "Concrete Test Regulations for Water Transport Engineering" JTJ 270, the rapid determination method of chloride ion content in concrete mixtures or other methods with better accuracy. Table 3.1.8 Maximum content of water-soluble chloride ions in concrete mixture (mass percentage of cement consumption, %) 3.1.9 The air content of the concrete mixture mixed with air-entraining agent or air-entraining admixture should meet the requirements in Table 3.1.9. Table 3.1.9 Concrete Air Content 3.2 Mechanical properties 3.2.1 The mechanical properties of concrete shall meet the design and construction requirements. The test methods for mechanical properties of concrete shall comply with the relevant provisions of the current national standard "Standards for Test Methods of Mechanical Properties of Ordinary Concrete" GB/T 50081. 3.2.2 Concrete strength grades should be divided into C10, C15, C20, C25, C30, C35, C40, C45, C50, C55, C60, C65, C70, C75, C80, C85 according to the cubic compressive strength standard value (MPa), C90, C95 and C100. 3.2.3 The compressive strength of concrete should be inspected and evaluated according to the relevant provisions of the current national standard "Concrete Strength Inspection and Evaluation Standard" GB/T 50107, and should be qualified. 3.3 Long-term performance and durability 3.3.1 The long-term performance and durability of concrete shall meet the design requirements. The test method should comply with the relevant provisions of the current national standard GB/T 50082 "Standard for Test Methods of Long-term Performance and Durability of Ordinary Concrete". 3.3.2 The classification of concrete frost resistance, water penetration resistance and sulfate corrosion resistance shall comply with the provisions in Table 3.3.2. Table 3.3.2 Classification of concrete frost resistance, water penetration resistance and sulfate attack resistance 3.3.3 The grading of the chloride ion penetration resistance of concrete shall meet the following requirements. 1 When the chlorine ion migration coefficient (RCM method) is used to classify the chloride ion penetration resistance of concrete, it shall comply with the provisions in Table 3.3.3-1, and the concrete age shall be 84d. Table 3.3.3-1 Classification of Concrete Resistance to Chloride Ion Penetration (RCM Method) 2 When electric flux is used to classify the chloride ion penetration resistance performance of concrete, it shall comply with the provisions in Table 3.3.3-2, and the age of concrete should be 28d. When the sum of cement admixture and mineral admixture in concrete exceeds 50% of the amount of cementitious material, the test age can be 56 days. Table 3.3.2 Classification of Concrete Resistance to Chloride Ion Penetration (Electric Flux Method) 3.3.4 Classification of concrete anti-carbonation performance shall comply with the provisions in Table 3.3.4. Table 3.3.4 Classification of Concrete Anti-carbonation Performance 3.3.5 The classification of early crack resistance performance of concrete shall comply with the provisions in Table 3.3.5. Table 3.3.5 Classification of early crack resistance performance of concrete 3.3.6 The durability of concrete shall be inspected and evaluated according to the relevant provisions of the current industry standard "Concrete Durability Inspection and Evaluation Standard" JGJ/T 193, and shall be qualified.

4 mix ratio control

4.0.1 The design of concrete mix ratio shall comply with the relevant provisions of JGJ 55, the current industry standard "Specifications for Design of Mixture Ratio of Ordinary Concrete". 4.0.2 The mix proportion of concrete shall meet the performance requirements of concrete construction, and the strength, other mechanical properties and durability shall meet the design requirements. 4.0.3 For the mix proportions that are used for the first time and whose use interval exceeds three months, the opening appraisal shall be carried out, and the opening appraisal shall meet the following requirements. 1 The raw materials used in production should be consistent with the mix ratio design. 2 The performance of the concrete mixture should meet the construction requirements. 3 Concrete strength evaluation shall meet the design requirements. 4 The durability of concrete shall meet the design requirements. 4.0.4 During the use of concrete mix ratio, it should be adjusted in time according to the dynamic information of concrete quality.

5 Production control level

5.0.1 Ready-mixed concrete should be used for concrete works. 5.0.2 The control level of concrete production can be characterized by the strength standard deviation (σ) and the percentage (P) of the number of groups whose measured strength reaches the strength standard value. 5.0.3 The standard deviation (σ) of concrete strength shall be calculated according to formula (5.0.3), and should comply with the provisions in Table 5.0.3. In the formula. σ - standard deviation of concrete strength, accurate to 0.1MPa; --The compressive strength value of the i-th group of concrete cube specimens within the statistical period, accurate to 0.1MPa; --The average value of the compressive strength of n groups of concrete cube specimens within the statistical period, accurate to 0.1MPa; --The number of test specimen groups of concrete of the same strength grade within the statistical period, the value shall not be less than 30. Table 5.0.3 Standard deviation of concrete strength (MPa) 5.0.4 The percentage (P) of the number of groups whose measured strength reaches the strength standard value shall be calculated according to formula 5.0.4, and P shall not be less than 95% In the formula. P--the percentage of the actual measured intensity reaching the intensity standard value group within the statistical period, accurate to 0.1%; n0--the number of test specimen groups with the same strength grade concrete reaching the strength standard value within the statistical period. 5.0.5 The statistical cycle of ready-mixed concrete batching plant and precast concrete component factory can be taken as one month; the statistical cycle of construction site mixing station can be determined according to the actual situation, but it should not exceed three months.

6 Production and construction quality control

6.1 General provisions 6.4.4 The mixing homogeneity of concrete in the same tray shall meet the following requirements. 1 The relative error of the two measured values of mortar density in concrete should not be greater than 0.8%. 2 The difference between the two measured values of concrete consistency shall not be greater than the absolute value of the allowable deviation of the concrete mixture consistency specified in Table 3.1.2-4. 6.4.5 When mixing concrete during construction in winter, it is advisable to give priority to heating water to increase the temperature of the mixture, and can also use the method of heating aggregate to increase the temperature of the mixture. When the mixing water and aggregates are heated, the heating temperature of the mixing water and aggregates should not exceed the regulations in Table 6.4.5; when the aggregates are not heated, the mixing water can be heated above 60°C. The aggregate and hot water should be put in for stirring first, and then the cementitious materials should be put in and stirred together. Table 6.4.5 Maximum Heating Temperature of Mixing Water and Aggregate (°C) 6.5 Transportation 6.5.1 During transportation, the concrete should be controlled not to segregate or delaminate, and the performance of the concrete mixture should be controlled to meet the construction requirements. 6.5.2 When the concrete is transported by a motorized dump truck, the road should be level. 6.5.3 When mixing tank trucks are used to transport concrete mixture, the mixing tanks should have thermal insulation measures in winter. 6.5.4 When the concrete mixture is transported by a mixing tank truck, the fast gear should be used to rotate the mixing tank for no less than 20 seconds before unloading. When the slump loss is large and unloading is difficult due to excessive transportation distance, traffic or on-site problems, the measure of adding an appropriate amount of water reducing agent to the concrete mixture and rotating the mixing tank at a high speed can be used to reduce water. Dosage should have a plan determined through experiments. 6.5.5 When pumping concrete is used, the concrete transportation shall ensure the continuous pumping of concrete, and shall comply with the relevant provisions of the current industry standard "Concrete Pumping Construction Technical Regulations" JGJ/T 10. 6.5.6 The time interval between unloading the concrete mixture from the mixer and receiving it at the construction site should not be greater than 90 minutes. 6.6 Casting and forming 6.6.1 Before pouring concrete, the size, specification, quantity and position of formwork, reinforcement, protective layer and embedded parts should be checked and controlled, and the deviation value should comply with the current national standard "Code for Construction Quality Acceptance of Concrete Structure Engineering" GB 50204 The stability of the formwork support and the tightness of the joints should be checked to ensure that the formwork is not unstable, does not run out of the formwork, and does not leak grout during the concrete pouring process. 6.6.2 Before pouring concrete, the debris in the formwork and on the cushion should be removed; the dry foundation soil, cushion and wooden formwork should be watered and moistened. 6.6.3 When the weather is hot in summer, the temperature of the concrete mixture entering the mold should not be higher than 35°C, and the concrete should be poured at night or at night; There is accumulated water, and shielding measures should be taken to prevent sunlight from shining on the metal formwork. ......

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