GBJ 119-1988 Technical Specification for Application of Concrete Admixtures GBJ119-88 GBJ119-1988 Standard download decompression password: www.bzxz.net

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National Standard of the People's Republic of China
Application of Concrete Admixtures
Technical Specifications
GBJ119-88
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National Standard of the People's Republic of China
Technical Specifications for Application of Concrete Admixtures
GBJ119-88
Editor Department: Ministry of Urban and Rural Construction and Environmental Protection of the People's Republic of China Approval Department: China State Planning Commission of the People's Republic of China Effective Date: December 1, 1988
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Notice on the Release of "Technical Specifications for Application of Concrete Admixtures"
Ji Biao [1988] No. 440
According to the requirements of the former State Construction Commission (81) Jianfa She Zi No. 546, the "Technical Specifications for Application of Concrete Admixtures" jointly compiled by the Ministry of Urban and Rural Construction and Environmental Protection and relevant departments has been reviewed by relevant departments. The "Technical Specifications for Application of Concrete Admixtures" GBJ119-88 is now approved as a national standard and will be implemented from December 1, 1988. This specification is managed by the Ministry of Urban and Rural Construction and Environmental Protection. Its specific interpretation work is the responsibility of the China Academy of Building Research. The publication and distribution is the responsibility of China Planning Press. State Planning Commission
March 22, 1988
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Preparation Instructions
This specification is prepared by the China Academy of Building Research in conjunction with the China Hydropower Research Institute and other units in accordance with the notice of the former State Construction Commission (81) Jianfa Shezi No. 546. During the preparation of this specification, the preparation team conducted extensive investigations and studies, summarized the practical experience of the application of admixtures in concrete in my country for more than 20 years, absorbed effective scientific research results, referred to relevant foreign standards and advanced technologies, and solicited opinions from relevant units across the country. After repeated discussions and revisions, it was finally finalized with relevant departments. This specification has eight chapters and five appendices, including general provisions, basic regulations, ordinary water reducers and high-efficiency water reducers, air entraining agents and air entraining water reducers, retarders and retarding water reducers, early strength agents and early strength water reducers, antifreeze agents, expansion agents, etc. In the process of implementing this specification, please pay attention to summarizing experience and accumulating data. If you find any need for modification and supplementation, please send the relevant information and opinions to the Institute of Building Engineering Materials and Products, China Academy of Building Research (Beijing Xiaohuangzhuang) for reference in future revisions.
Urban and Rural Construction Environmental Protection Department
March 1988
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Chapter 1 General
Chapter 2
Chapter 3
Section 1
Section 2
Chapter 4
Section 1
Section 2
Chapter 5
Section 1
Section 2
Chapter 6
Section 1
Section 2
Chapter 7|| tt||Section 1
Section 2
Section 3
Chapter 8
Section 1
Basic Provisions
(2)
Ordinary Water-Reducing Agent and High-Efficiency Water-Reducing Agent (3)
General Provisions
Air-Entraining Agent and Air-Entraining Water-Reducing Agent
General Provisions
Retarder and Retarder Water-Reducing Agent
General Provisions
Early Strength Agent and Early Strength Water-Reducing Agent
General Provisions
General Provisions
Quality Control of Concrete Added with Antifreeze Agent
General Provisions||tt| |Engineering Construction Standards Full-text Information System
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Section 2 Performance requirements of expansive concrete (mortar)Section 3 Application
Appendix—
Terminology
Appendix 3
Concrete mix design
Appendix 3||t t||Test method for expansion rate and shrinkage rate of expansive concrete
Appendix 4
Composition and dosage of commonly used composite early strength agent and early strength water reducing agent
Appendix 5
Explanation of terms used in this specification
Additional explanation
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Chapter 1 General
Article 1.0.1 This standard is formulated in order to reasonably select and correctly use various admixtures so that they can improve the performance and achieve the expected effect after being added to concrete. Article 1.0.2 This specification applies to the application of ordinary water reducing agent, high-efficiency water reducing agent, air entraining agent and air entraining water reducing agent, retarder and retarding water reducing agent, early strength agent and early strength water reducing agent, antifreeze agent and expansive agent in concrete engineering. Article 1.0.3 In addition to the provisions of this code, the production and use of concrete with admixtures shall also comply with the current national "Concrete Admixture Quality Standard" and "Reinforced Concrete Engineering Construction and Acceptance Code" and relevant standards and specifications. Engineering Construction Standard Full Text Information System
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Chapter II Basic Provisions
Article 2.0.1 The type of admixture should be selected based on the main purpose of using the admixture and determined through technical and economic comparison. Article 2.0.2 The amount of admixture should be determined through tests according to its type and based on factors such as use requirements, construction conditions, and concrete raw materials. Article 2.0.3 The amount of admixture (calculated as solid) should be expressed as a percentage of cement weight, and the weighing error should not exceed 2% of the specified measurement. Article 2.0.4 The cement used in concrete with admixtures can be silicate cement, ordinary silicate cement, slag silicate cement, pozzolanic silicate cement, and fly ash silicate cement.
Article 2.0.5 The coarse and fine aggregates used in concrete with admixtures shall comply with the provisions of the relevant national standards in force.
Article 2.0.6 The mix design of concrete with admixtures may be carried out in accordance with the provisions of Appendix II of this specification.
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Chapter 3 Ordinary Water Reducers and High-efficiency Water Reducers Section 1 General Provisions
Article 3.1.1 The following water reducers may be used in concrete engineering: 1. Lignin sulfonates: such as calcium lignin sulfonate and sodium lignin sulfonate; 2. Polycyclic aromatic sulfonates: such as salts of naphthalene and naphthalene homologous sulfonates condensed with formaldehyde;
3. Water-soluble resin sulfonates: such as sulfonated melamine resin and sulfonated coumarone resin;
4. Others such as humic acid, etc.
Article 3.1.2 Water-reducing agent can be used for cast-in-place or prefabricated concrete, reinforced concrete and prestressed concrete. www.bzxz.net
Article 3.1.3 Ordinary water-reducing agent should be used for concrete constructed with a daily minimum temperature of 5°C or above, and should not be used alone for steam-cured concrete. Article 3.1.4 High-efficiency water-reducing agent can be used for concrete constructed with a daily minimum temperature of 0°C or above, and is suitable for the preparation of high-fluidity concrete, high-strength concrete and steam-cured concrete.
Article 3.1.5 When lignin sulfonate water-reducing agent is added to cement using anhydrite or industrial waste gypsum as a setting regulator, a cement adaptability test should be conducted first, and it can only be used after passing the test.
Section 2 Construction
Article 3.2.1 The appropriate dosage of ordinary water-reducing agent is 0.2~0.3%. The dosage can be appropriately increased or decreased with the temperature, but it shall not be greater than 0.5%. The appropriate dosage of high-efficiency water reducer is 0.5~1.0%, which can be appropriately increased or decreased according to the needs of the project. Engineering Construction Standard Full Text Information System
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Article 3.2.2 Water reducer should be added as a solution, and the amount of water in the solution should be deducted from the mixing water.
Article 3.2.3 Water reducer should be added to the mixer at the same time as the mixing water. When using a mixer truck to transport concrete, it can be added to the mixer truck before unloading, and the material can be discharged after being mixed evenly. Article 3.2.4 For the mixture of concrete mixed with water reducer, the pouring and vibration methods from the time of unloading from the mixer to the completion of pouring are the same as those of concrete without water reducer.
Article 3.2.Article 5: According to the needs of the project, water reducing agent can be used in combination with other admixtures, and its dosage must be determined according to the test. When preparing the solution, if flocculation or precipitation occurs, the solution should be prepared separately and added to the mixer separately. Article 3.2.6: When the concrete mixed with water reducing agent is naturally cured, the initial curing should be strengthened. When the concrete mixed with high-efficiency water reducing agent is steam cured, the concrete should have the necessary structural strength before heating, and the steam curing system should be determined through experiments. Engineering Construction Standard Full Text Information System
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Chapter 4 Air-entraining Agents and Air-entraining Water-reducing Agents
Section 1 General Provisions
Article 4.1.1 In concrete engineering, the following air-entraining agents can be used: 1. Rosin resins: such as rosin thermal polymers, rosin soaps, etc.; 2. Alkyl benzene sulfonates: such as alkyl benzene sulfonates, alkylphenol polyoxyethylene ethers, etc.,
3. Fatty alcohol sulfonates: such as fatty alcohol polyoxyethylene ethers, fatty alcohol polyoxyethylene sulfonic acid sodium, etc.;
4. Others: such as protein salts, petroleum sulfonates, etc. Article 4.1.2 In concrete engineering, the following air-entraining water-reducing agents can be used: 1. Modified lignin sulfonates;
2. Alkyl aromatic sulfonates: such as naphthalene sulfonate formaldehyde condensates; 3. Composite agents composed of various air-entraining agents and water-reducing agents. Article 4.1.3 Air-entraining agent and air-entraining water-reducing agent can be used for frost-resistant concrete, anti-seepage concrete, sulfate-resistant concrete, concrete with severe bleeding, lean concrete, lightweight aggregate concrete and concrete with requirements for finishing. Article 4.1.4 Air-entraining agent should not be used for steam-cured concrete and prestressed concrete. Section 2 Construction
Article 4.2.1 Concrete with high requirements for freeze-thaw resistance must be mixed with air-entraining agent or air-entraining water-reducing agent. The amount of air-entraining agent or air-entraining water-reducing agent should be determined through tests based on the air content requirements of concrete. The air content of concrete with air-entraining agent and air-entraining water-reducing agent should not exceed the requirements of Table 4.2.1. For concrete with high requirements for freeze-thaw resistance, the air content values ​​specified in Table 4.2.1 should be adopted.
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Air content of concrete mixed with air-entraining agent and air-entraining water-reducing agent Maximum particle size of coarse aggregate (mm)
Air content of concrete (%)
Article 4.2.2 Air-entraining agent and air-entraining water-reducing agent shall be added as a solution and added to the mixing water when used. The amount of water in the solution shall be deducted from the amount of mixing water. Article 4.2.3 When preparing the solution of air-entraining agent and air-entraining water-reducing agent, it must be fully dissolved. If flocculation or precipitation occurs, it shall be heated to dissolve before use. Article 4.2.4 Air-entraining agent can be used in combination with water-reducing agent, early strength agent, retarder and antifreeze agent. If flocculation or precipitation occurs when preparing the solution, the solutions shall be prepared separately and added to the mixer separately.
Article 4.2.5 The air content of concrete shall be strictly controlled during construction. When the materials or construction conditions change, the dosage of air-entraining agent or air-entraining water-reducing agent shall be increased or decreased accordingly. Article 4.2.6 To test the air content of concrete with air-entraining agent and air-entraining water-reducing agent, sampling shall be carried out at the mixer discharge port, and the loss of air content of concrete during transportation and vibration shall be considered.
Article 4.2.7 Concrete with air-entraining agent and air-entraining water-reducing agent must be mechanically stirred, and the stirring time should not be more than 5 minutes and less than 3 minutes. The parking time from discharge to pouring should not be too long. When using an inserted vibrator, the vibration time should not exceed 20 seconds. Engineering Construction Standard Full-text Information System
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