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GB/T 41054-2021 English PDF (GBT41054-2021)

GB/T 41054-2021 English PDF (GBT41054-2021)

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GB/T 41054-2021: Technical specification for high performance concrete

This Standard specifies the classification and performance levels, general requirements, raw materials, mixing proportions, quality requirements, preparation, test methods, inspection rules, ordering and delivery of high performance concrete. This Standard applies to high performance concrete for industrial and civil construction, municipal, railway, highway, water transportation, marine engineering, water conservancy, energy and other construction projects.
GB/T 41054-2021
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 91.100.30
CCS Q 13
Technical specification for high performance concrete
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Content
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions... 6
4 Classification and performance level ... 7
5 General requirements ... 9
6 Raw materials ... 9
7 Mixing proportion ... 13
8 Quality requirements ... 19
9 Preparation ... 22
10 Test methods ... 24
11 Inspection rules ... 24
12 Ordering and delivery ... 26
Annex A (normative) Construction of high performance concrete ... 27
Technical specification for high performance concrete
1 Scope
This Standard specifies the classification and performance levels, general requirements, raw materials, mixing proportions, quality requirements, preparation, test methods, inspection rules, ordering and delivery of high performance concrete.
This Standard applies to high performance concrete for industrial and civil construction, municipal, railway, highway, water transportation, marine engineering, water conservancy, energy and other construction projects.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB 175, Portland Cement and Ordinary Portland Cement
GB/T 176, Method for Chemical Analysis of Cement
GB/T 200, Moderate-heat Portland cement, low-heat Portland cement
GB/T 1346, Test methods for water requirement of normal consistency, setting time and soundness of the Portland cement
GB/T 1596, Fly ash used for cement and concrete
GB/T 8074, Testing method for specific surface of cement - Blaine method GB 8076, Concrete Admixtures
GB/T 10171, Building construction machinery and equipment - Concrete mixing plant (tower)
GB/T 12959, Test methods for heat of hydration of cement
GB/T 14902, Ready-mixed concrete
GB/T 14684, Sand for construction
GB/T 14685, Pebble and crushed stone for construction
GB/T 17671, Test method of cement mortar strength (ISO method)
GB/T 18046, Ground granulated blast furnace slag used for cement, mortar and concrete
GB/T 20491, Steel slag powder used for cement and concrete
GB/T 23439, Expansive agents for concrete
GB/T 26751, Ground granulated electric furnace phosphorous slag powder used for cement and concrete
GB/T 27690, Silica fume for cement mortar and concrete
GB/T 30190, Concrete with Ground Limestone
GB/T 50080, Standard for test method of performance on ordinary fresh concrete GB/T 50081, Standard for test methods of concrete physical and mechanical properties
GB/T 50082, Standard for test methods of long-term performance and durability of ordinary concrete
GB/T 50107, Standard for Evaluation of Concrete Compressive Strength
GB 50119, Code for utility technical of concrete admixture
GB 50164, Standard foe quality control of concrete
GB 50204, Code for acceptance of constructional quality of concrete structures GB/T 50476, Standard for design of concrete structure durability
GB 50496, Code for construction of mass concrete
GB 50666, Code for construction of concrete structures
GB/T 50733, Technical Code for Prevention of Alkali-aggregate Reaction in Concrete
JG/T 377, Anti-freezing and pumping admixtures for concrete
JC 475, Concrete anti-freezing admixtures
JG/T 315, Natural pozzolanic materials used for cement mortar and concrete JG/T 486, Compound Mineral Admixtures for Concrete
JG/T 568, Aggregate for high performance concrete
JGJ/T 12, Technical specification for lightweight aggregate concrete structures JGJ 55, Specification for Mixing proportion Design of Ordinary Concrete JGJ 63, Standard of Water for Concrete
JGJ/T 178, Technical specification for application of shrinkage-compensating concrete
JGJ/T 193, Standard for inspection and assessment of concrete durability JGJ 206, Technical code for application of sea sand concrete
JGJ/T 221, Technical specification for application of fiber reinforced concrete JGJ/T 281, Technical specification for application of high strength concrete JGJ/T 283, Technical specification for application of self-compacting concrete JGJ/T 322, Technical Specification for Test of Chloride Ion Content in Concrete JGJ/T 328, Technical Specification for Green Production and Management of Ready-mixed Concrete
JGJ/T 385, Standard for Assessment of High Performance Concrete
JT/T 522, Curing compounds of concrete for highway engineering
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. 3.1 high performance concrete
concrete that its overall goal is to have specific requirements for concrete performance in the design, construction and use of construction engineering, that selects high-quality conventional raw materials, uses reasonable addition of admixtures and mineral admixtures, adopts lower water-binder ratio and optimize mixing proportion, is made with excellent mixture properties, mechanical properties, durability and long-term performance through ready-mix and green production methods and strict construction measures
[Source: JGJ/T 385-2015, 2.0.1]
3.2 ordinary high performance concrete
concrete that meets the technical requirements of high performance concrete and is commonly used except for special high performance concrete
Inspection items and inspection batches shall comply with the provisions of GB 50164. 6.2 Mineral admixture
6.2.1 High performance concrete can be prepared with fly ash, granulated blast furnace slag powder, silica fume, steel slag powder, granulated electric furnace phosphorus slag powder, limestone powder, natural pozzolanic materials, composite admixture and so on. The performance of fly ash shall meet the requirements of GB/T 1596. The performance of granulated blast furnace slag powder shall meet the requirements of GB/T 18046. The performance of silica fume shall meet the requirements of GB/T 27690. The performance of steel slag powder shall meet the requirements of GB/T 20491. The performance of granulated electric furnace phosphorus slag powder shall meet the requirements of GB/T 26751. The performance of limestone powder shall meet the requirements of GB/T 30190. The performance of natural pozzolanic materials shall comply with the provisions of JG/T 315. The performance of the composite admixture shall comply with the provisions of JG/T 486.
6.2.2 The use of other admixtures shall be studied and demonstrated through systematic tests. The long-term performance and durability test shall be carried out to verify that it meets the engineering requirements before it can be used.
6.2.3 For high-strength and high performance concrete or concrete with impermeability, frost resistance, corrosion resistance, wear resistance or other special requirements, fly ash lower than class II shall not be used.
6.2.4 Admixtures shall not contain activators or other additives that affect the long-term performance and durability of concrete.
6.2.5 When admixtures enter the site, it shall provide quality certification documents such as type inspection report, exit-factory inspection report or certificate of conformity. They shall be inspected. Inspection items and inspection batches shall comply with the provisions of GB 50164.
6.3 Aggregate
6.3.1 Aggregate shall comply with the provisions of GB/T 14684 and GB/T 14685. The content of artificial sand and gravel powder, sieve residue, flake particle content and coarse aggregate irregular particle content shall comply with the provisions of JG/T 568. When JG/T 568 is adopted and the technical indicators have classification requirements, it shall not be lower than level I.
6.3.2 Sea sand shall be purified by fresh water elutriation, and shall comply with the regulations of JG/T 568 and JGJ 206.
6.3.3 High performance concrete shall use non-alkali active aggregate. When using alkali-active aggregates, in addition to measures to inhibit the alkali activity of aggregates, isolation measures shall also be taken on the concrete surface. The technical measures to prevent concrete alkali-aggregate reaction shall comply with the provisions of GB/T 50733.
6.3.4 When aggregate enters the site, it shall provide quality certification documents such as type inspection report, factory inspection report or certificate of conformity. It shall be inspected. Inspection items and inspection batches shall comply with the provisions of GB 50164.
6.4 Admixture
6.4.1 The type and dosage of admixtures shall be determined according to the requirements of concrete structure design, construction, structural characteristics and environmental conditions where the project is located.
6.4.2 The performance of high performance water-reducing agent, high-efficiency water-reducing agent, ordinary water-reducing agent, air-entraining water-reducing agent, pumping agent, early-strength agent, retarder and air-entraining agent shall meet the requirements of GB 8076 and GB 50119. The 28d shrinkage ratio shall not be greater than 110%. The performance of the expansion agent shall meet the requirements of GB/T 23439 and JGJ/T 178. The performance of antifreeze shall meet the requirements of JG 475. The performance of antifreeze pumping agent shall comply with the provisions of JG/T 377. When other new types of admixtures are used, they can be used only when the properties, mechanical properties and durability of the concrete mixture are verified by tests to meet the engineering requirements. 6.4.3 The admixture shall have good compatibility with cement, admixture, sand and other materials.
6.4.4 Admixtures containing hexavalent chromium, nitrite and thiocyanate shall not be used in concrete that is in direct contact with drinking water after construction in drinking water projects.
6.4.5 Early-strength ordinary water-reducing admixtures, early-strength admixtures, antifreeze agents and waterproofing agents containing strong electrolyte inorganic salts shall not be used in the following concrete structures:
- Concrete structures in contact with galvanized steel or aluminum;
- Concrete structures with embedded steel reinforcement with leakage without protective measures;
- Concrete structures using DC power;
- Concrete structures within 100m of the high-voltage DC power supply.
6.4.6 Early-strength ordinary water-reducing admixtures, early-strength agents, water- repellents and chloride-salt antifreezes containing chloride salts shall not be used in 9.3.1 Production metering shall comply with the provisions of GB/T 14902. 9.3.2 For the measurement of admixtures, it is advisable to use metering equipment with higher precision alone or other effective measures to improve the measurement accuracy of admixtures.
9.3.3 When special raw materials such as fibers are added, special personnel shall be assigned to be responsible for measurement operations and environmental safety. 9.3.4 Dust emissions during metering shall be strictly controlled. Regularly replace the filter element of the dust removal device.
9.4 Stirring
9.4.1 Stirring shall meet the requirements of GB/T 14902 and GB 50164.
9.4.2 A forced mixer shall be used. It is advisable to use vibration stirring and other stirring equipment that can make the material disperse more uniformly and have better stirring effect.
9.4.3 The mixing process shall be determined according to the concrete mixing proportion and mixing equipment.
9.4.4 The temperature of powder material in the production of high performance concrete shall not be higher than 60???.
9.4.5 The temperature of the mixture shall be controlled by the following measures: a) When mixing concrete during construction in winter, it is advisable to use the method of heating water to increase the temperature of the mixture. It is also possible to increase the temperature of the mixture by heating the aggregate at the same time;
b) When mixing concrete in hot season, measures such as shading, spraying and air cooling shall be taken to reduce the aggregate temperature. When mixing concrete, cold water or ice chips can be used to reduce the temperature of the mixture. 9.5 Transportation
9.5.1 Transportation shall comply with the provisions of GB/T 14902, GB 50164 and GB 50666.
9.5.2 When the mixer truck enters and leaves the factory area, it shall be washed with circulating water to maintain hygiene and cleanliness. Wastewater from flushing trucks can enter a wastewater recycling facility.
9.5.3 High performance concrete shall not be watered during transportation. 10 Test methods
10.1 Cement properties
10.1.1 The specific surface area shall be determined according to the method of GB/T 8074.
10.1.2 The 3d compressive strength and 28d compressive strength shall be determined according to the method of GB/T 17671. The 28d/3d compressive strength ratio is the ratio of the 28d compressive strength to the 3d compressive strength.
10.1.3 The C3A content of clinker shall be determined according to the method of GB/T 176.
10.1.4 The 3d hydration heat and the 7d hydration heat shall be determined according to the method of GB/T 12959.
10.1.5 The chloride ion content shall be determined according to the method of GB/T 176.
10.1.6 The water consumption of standard consistency shall be determined according to the method of GB/T 1346.
10.2 Performances of high performance concrete mixes
10.2.1 The content of water-soluble chloride ions shall be determined according to the method of JGJ/T 322.
10.2.2 The properties of other high performance concrete mixtures shall be determined according to the methods of GB/T 50080.
10.3 High performance concrete strength
The strength of high performance concrete shall be determined according to the method of GB/T 50081.
10.4 Durability and long-term performance of high performance concrete
The durability and long-term performance of high performance concrete shall be determined according to the method of GB/T 50082.
11 Inspection rules
11.1 Inspection items
High performance concrete shall be tested for water-soluble chloride ion content, slump, Annex A
(normative)
Construction of high performance concrete
A.1 Pouring of ordinary high performance concrete
The pouring of conventional high performance concrete shall meet the following requirements:
a) Water shall not be added to the concrete;
b) The temperature of the high performance concrete into the mold shall not be higher than 35??C, and shall not be lower than 5??C;
c) Concrete shall be compacted;
d) The pouring shall comply with the provisions of GB 50164 and GB 50666. A.2 Maintenance of ordinary high performance concrete
A.2.1 Maintenance shall comply with the provisions of GB 50164 and GB 50666. A.2.2 Moisture maintenance shall be carried out in time after pouring. For large-area exposed horizontal components, vertical components and large-volume components, the maintenance start time and maintenance duration shall be determined according to the component size, environmental conditions and construction conditions. The maintenance time shall be properly extended for the concrete with a large amount of mineral admixture.
A.2.3 When using concrete maintenance agent for maintenance, the effective water retention rate of the maintenance agent shall not be less than 90%. The compressive strength ratio of 7d and 28d shall not be less than 95%. The test methods for the effective water retention rate and compressive strength ratio of the maintenance agent shall comply with the provisions of JT/T 522.
A.2.4 Maintenance water shall comply with the provisions of JGJ 63. Untreated seawater shall not be used for reinforced concrete and prestressed concrete maintenance. The temperature difference between the temperature of the maintenance water and the temperature of the concrete surface shall not be greater than 20??C.
A.2.5 During natural maintenance, the heat preservation and moisturizing maintenance time after the concrete is poured shall comply with the provisions of Table A.1.

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