This standard specifies the terminology, code, technical requirements, test methods, inspection rules, packaging, marking, storage and transportation, acceptance rules and sampling rules for special anti-corrosion lubricating grease for unbonded prestressed bars. This standard is applicable to special anti-corrosion lubricating grease for unbonded prestressed bars made by thickening deeply refined mineral lubricating oil with fatty acid mixed metal soap and adding various additives. It is suitable for lubrication, rust prevention and corrosion prevention of unbonded prestressed bars under normal environment. JG 3007-1993 Special anti-corrosion lubricating grease for unbonded prestressed bars JG3007-1993 Standard download decompression password: www.bzxz.net

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Construction Industry Standard of the People's Republic of China JG3007-93
Corrosion-resistant and lubricating grease specialized for unbonded tendonsConstruction Standard
Published on August 31, 1993
Ministry of Construction of the People's Republic of China
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Implemented on December 1, 1993
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Construction Industry Standard of the People's Republic of China Corrosion-resistant and lubricating grease specialized for unbonded tendons tendonsJG3007—93
Subject content and scope of application
This standard specifies the terminology, code, technical requirements, test methods, inspection rules, packaging, marking, storage and transportation, acceptance rules and sampling rules for anti-corrosion grease for unbonded prestressed tendons. This standard applies to anti-corrosion grease for unbonded prestressed tendons made by thickening deeply refined mineral lubricating oil with fatty acid mixed metal soap and adding a variety of additives. It is suitable for lubrication, rust prevention and corrosion prevention of unbonded prestressed tendons under normal conditions.
2 Reference standards
GB/T269
GB/T4929
GB/T512
SH/T0324
SH/T-0381
GB/T7325
SH0387
GB/T2361
SH/T0081
SH/T0325
GB/T264
HG2-146
GB1040
SH0164
SH0229
3 Terminology
3.1 Lubricating grease
Cone penetration test method for lubricating grease and petroleum grease|| tt||Determination of dropping point of lubricating grease
Determination of moisture content of lubricating grease
Determination of oil separation on steel mesh of lubricating grease (static method)Test method for corrosion of lubricating grease
Determination of evaporation loss of lubricating grease and lubricating oilSurface grease of wire rope (Appendix II: Determination method for low temperature performance)Wet heat test method for anti-rust grease
Salt spray test method for anti-rust grease
Determination of oxidation stability of lubricating grease
Determination of acid value of petroleum products
Test method for oil resistance of plastics
Tensile test method for plastics
Rules for packaging, storage, transportation and delivery acceptance of petroleum productsSampling method for solid and semi-solid petroleum products
A stable solid or semi-solid product composed of a thickener dispersed in a liquid lubricant. This product can be added with additives and fillers to improve the relevant properties. 3.2 Working cone penetration
The cone penetration of the grease measured after the sample is kept at a constant temperature of 25°C and given 60 back-and-forth work in a standard grease worker.
3.3 Dropping point
The lowest temperature at which a solid or semi-solid petroleum product reaches the specified fluidity under specified conditions, expressed in °C. 3.4 Steel mesh oil separation
The amount of liquid lubricating oil precipitated from the grease in the specified test instrument and test conditions, expressed in weight percentage.
3.5 Water
The water content present in petroleum products.
3.6 Corrosion test
Under specified conditions, the test is used to test the corrosion effect of oil on metal. 3.7
Evaporation amount
The weight percentage of the loss of oil after evaporation under specified conditions. 3.8
Low temperature performance
The flexibility of grease at low temperature and its adhesion to metal surface. Wet heat test
Under specified conditions, the metal test piece coated with grease is placed in a test box with specified temperature and humidity, and the rust of the test piece is observed after a certain period of time to estimate the grease coating's resistance to temperature and humidity corrosion. 3.10 Salt spray test
Under specified conditions, the sample is coated on the metal test piece and then placed in sodium chloride salt spray for a specified period of time. The rust of the test piece is observed to estimate the grease coating's ability to prevent salt spray corrosion. 3.11
Oxidation stability
The ability of oil products to resist the effects of the atmosphere (or oxygen) and maintain their properties without permanent changes. 3.12 Compatibility with casing
After placing the casing in grease at a specified temperature for a specified time, the oil absorption rate and tensile strength change rate of the casing are measured to determine the effect of grease on the casing. The compatibility index for casing in this standard is obtained based on the test results of high-density polyethylene. bZxz.net
4 Code and Marking
The marking of special anti-corrosion lubricating grease for unbonded prestressed tendons consists of three parts: code of product name, technical characteristics (including brand, test grade) and standard number:
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UTG—
2·720
JG3007
Salt spray grade 2 (indicator after 720h salt spray test) brand, distinguishable by cone penetration
Marking example of special anti-corrosion lubricating grease for unbonded prestressed tendons: No. 1 special anti-corrosion lubricating grease for unbonded prestressed tendons with a cone penetration of 296~325 is marked as UTGI—2.720,JG3007.
5 Technical requirements
Technical requirements for special anti-corrosion grease for unbonded prestressed tendons Table 1
Working dimension penetration, 1/10mm
point, ℃ not less than
minute, % - Not more than
Oil separation of steel mesh (100℃, 24h), % Not more than Corrosion test (45# steel sheet, 100℃, 24h) Evaporation (99℃, 22h), % Not more than
Low temperature performance (-40℃, 30min)
Wet heat test (45# steel sheet, 30d), Level Not more than Salt spray test (45# steel sheet, 30d), Level Not more than Oxidation stability (99℃, 100h, 78.5×10°Pa) A Pressure drop after oxidation, Pa Not more than
B Acid value after oxidation, mgKOH/g Not more than
Compatibility with casing (65℃.40d)
A Oil absorption, % not more than
B Tensile strength change rate, % not more than
6 Test method
6.1 Working cone penetration
Perform according to GB/T269;
6.2 Dropping point determination
Perform according to GB/T4929;
6.3 Moisture determination
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Quality index
296~325
14.7×104
265~295
14.7×104
Test method
GB/T4929
GB/T512
SH/T0324
SH/T0331
GB/T/7325
SH0387 Appendix II
GB/T2361
SH/T0081
SH/T0325
GB/T264
HG7—146
GB1040
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According to GB /T512
6.4 Steel mesh oil separation
According to SH/T0324;
6.5 Corrosion test
According to SH/T0331, but the test conditions are changed from 100℃, 3h to 100℃, 24h; 6.6 Evaporation determination
According to GB/T7325
Low temperature performance determination
According to Appendix II of SH0387, but the test conditions are changed from -30℃, 30min to -40℃, 30min6.8
Wet heat test
According to GB/T2361. Sample coating: Place the surface treated 45# steel test piece on the flat glass, and place two pieces of glass 0.2mm steel sheet, then apply anti-rust grease on the test piece, and then use a clean and smooth scraper to repeatedly scrape it flat and re-check the grease thickness by weighing method until the grease on the surface of the test piece is free of bubbles and smooth; 6.9
Salt spray test
Perform according to SH/T0081, and the test time is 30d. The coating method and thickness of the sample are the same as those in Article 6.8; 6.10
Oxidation stability method
After determining the pressure drop after oxidation according to SH/T0325, determine the acid value after oxidation according to GB/T264; 6.11 Compatibility test for casing
Determine the oil absorption rate of casing material according to HG2-146, and determine the tensile strength change rate of casing material according to GB1040. 7
Inspection rules
Inspection classification
Product inspection is divided into factory inspection and type inspection. Factory inspection
Factory inspection is a test that must be carried out when the product is delivered. Factory inspection items
Working cone penetration;
Drop point,
Water content,
Steel mesh oil separation;
Corrosion test.
Each kettle product should be inspected before delivery. The product can only be shipped after it passes the inspection and is accompanied by a product quality inspection certificate. 7.3 Type inspection
7.3.1 Type inspection is to conduct a comprehensive assessment of product quality. All items in Table 1 of the technical requirements of this standard should be inspected.
7.3.2 Type inspection must be carried out in any of the following situations: a. When the product is converted:
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When there are major changes in raw materials and processes;
When major equipment failures occur during the production process after the production equipment is modified; when the product is resumed after a long period of suspension; when there is a large difference between the factory inspection and the last type inspection; when the national quality supervision agency proposes to conduct type inspection. Under normal circumstances, type inspection should be carried out every two years. Execution of inspection
The factory inspection and type inspection of the product shall be carried out by the quality supervision department of the manufacturer. 7.4.2 The acceptance retest of the product can be carried out by the purchaser or the quality supervision department entrusted by the purchaser according to the project requirements. 7.5
Test result judgment
When all the test results meet the technical requirements of this standard, the product of the kettle is qualified; when one or more data of the product test results do not meet the technical requirements of this standard, the sample should be doubled for re-testing. If the re-test result is still unqualified, the product of the kettle is unqualified. 7.6 Quality arbitration
When the parties to the insurance have objections to the product quality, they can resolve them through negotiation, or jointly select a statutory arbitration unit to arbitrate the product quality according to this standard.
Packaging, marking, purchase and storage
The packaging, marking, storage, transportation and delivery acceptance of this product shall be carried out in accordance with SH0164. 9 Sampling
Sampling shall be carried out in accordance with SH0229.
The sampling volume is 2.0kg, which is fully mixed and divided into two parts, one for inspection and the other for retention. The sample retention period is 6 months.
Additional Notes:
This standard was proposed by the Standard and Norms Research Institute of the Ministry of Construction of the People's Republic of China. This standard is managed by the China Academy of Building Research, the technical management unit of the Ministry of Construction's construction engineering standards. This standard was drafted by the Building Structure Research Institute of the China Academy of Building Research, Changsha Oil Plant of Hunan Province, Beijing Institute of Building Engineering, Petrochemical Research Institute of China Petrochemical Corporation, and Dalian Prestressed Machinery Factory. The main drafters of this standard are: Lu Jin, Wang Yi, Peng Binkun, Zhang Yuming, Liang Huifang, Dai Jinting, Tao Xuekang, and Liu Zhongqi. This standard is entrusted to the China Academy of Building Research for interpretation. Engineering Construction Standards Full Text Information System
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