GB 175-1999 Portland cement, ordinary Portland cement

This standard specifies the definition and code, material requirements, strength grade, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of Portland cement and ordinary Portland cement. This standard is applicable to Portland cement and ordinary Portland cement. GB 175-1999 Portland cement, ordinary Portland cement GB175-1999 standard download decompression password: www.bzxz.net

GB 175-1999
This standard is revised to make the strength test method of cement in my country in line with international standards. This standard refers to ENV197-1:1995 European cement trial standard.
Compared with the original GB175-1992, the main modifications of this standard are: 1. The strength test method of cement is replaced by GB/T17671--1999 "Test method for strength of cement mortar (ISO method)" instead of GB/T177-1985 "Test method for strength of cement mortar"; 2. The cement grade is changed to strength grade.
This standard shall be implemented from December 1, 1999, and GB175-1992 "Portland cement, ordinary Portland cement" shall be abolished from December 1, 2000. During the transition period, GB175-1992 shall prevail. This standard is proposed by the State Administration of Building Materials Industry. This standard is under the jurisdiction of the National Cement Standardization Technical Committee. This standard was drafted by: Institute of Cement Science and New Building Materials, China Academy of Building Materials Science. The main drafters of this standard are: Bai Xianming, Yan Bilan, Wang Wenyi, Zhang Datong, Yang Jidian, Wang Xin, Liu Chen, Xiao Zhongming. This standard was first issued in 1956, revised for the first time in 1962, revised for the second time in 1977, revised for the third time in 1985, and revised for the fourth time in 1992.
1 Scope
National Standard of the People's Republic of China
Portland cement, ordinary portland cement
Portland cement and ordinary portland cementGB 175—1999
Replaces GB 175-1992
This standard specifies the definition and code, material requirements, strength grades, technical requirements, test methods, inspection rules, packaging, marking, transportation and storage of Portland cement and ordinary portland cement. This standard applies to Portland cement and ordinary portland cement. 2 Reference Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest versions of the following standards. Chemical analysis methods for cement (eqvISO680:1990) GB/T 176.-1996
GB/T 203--1994
Granulated blast furnace slag for cement (neqrOCT3476:1974) GB/T 750---1992
Test method for stability of cement autoclave
GB/T 1345--1991
Test method for cement fineness (80μm sieve analysis method)Test method for water consumption, setting time and stability of cement standard consistency (neqISO/DIS9597) GB/T 1346 - 1989
GB/T 1596:1991
GB/T 2847---1996
GB/T 5483-- 1996
GB/T 8074 -1987
Fly ash for cement and concrete
Pozzolanic admixtures for cement (neqISO863:1990)Gypsum and anhydrite (neqISO1587:1975)Determination of specific surface area of ​​cement-Blaine method (neqASTMC204:1981)GB 9774 -- 1996:
Cement packaging bag
GB12573—1990Cement sampling method
GB/T17671:1999Test method for cement mortar strength (ISO method)idtISO679:1989)JC/T667--1997Technical admixtures for cement grindingJC/T742—1984（1996）Rotary kiln dust added to cement3Definition and code
3.1 Portland cement
Any hydraulic cementitious material made by grinding Portland cement clinker, 0-~5% limestone or granulated blast furnace slag, and appropriate amount of gypsum is called Portland cement (commonly known as Portland cement abroad). There are two types of Portland cement. The one without mixed materials is called Class 1 Portland cement, code P·1. When grinding silicate cement, limestone or granulated blast furnace slag mixed materials not exceeding 5% of cement mass are added, which is called type I silicate cement, code P·1.
3.2 Ordinary silicate cement
Any hydraulic cementing material made by grinding silicate cement clinker, 6%15% mixed materials and appropriate amount of gypsum is called ordinary silicate cement (referred to as ordinary cement). Code P·. Approved by the State Administration of Quality and Technical Supervision on July 30, 1999 and implemented on December 1, 1999
GB 175—1999
When adding active mixed materials, the maximum amount shall not exceed 15%, of which kiln dust not exceeding 5% of cement mass or inactive mixed materials not exceeding 10% of cement mass are allowed to replace. When adding inactive mixed materials, the maximum amount shall not exceed 10% of cement mass. 4. Material requirements
4.1 Stone
Natural stone: Gypsum or anhydrite of Class G or Class A Grade II (inclusive) or above as specified in GB/T5483. T. Industrial by-product stone: A by-product of industrial production with calcium sulfate as the main component. When using industrial by-product gypsum, it must be tested to prove that it is harmless to cement performance.
4.2 Active mixed materials
Granulated blast furnace slag in accordance with GB/T203, fly ash in accordance with GB/T1596, and pozzolanic mixed materials in accordance with GB/T2847.
4.3 Inactive mixed materials
Granulated blast furnace slag, fly ash, pozzolanic mixed materials, limestone and sandstone with activity index lower than that of GB/T203, GB/T1596 and GB/T2847. The content of aluminum oxide in limestone shall not exceed 2.5%.4.4 Kiln demon
Should meet the requirements JC/T742.
4.5 Grinding aids
Grinding aids are allowed to be added when grinding cement. The amount added shall not exceed 1% of the cement mass. The grinding aids must comply with the provisions of JC/T667. 5 Strength grade
The strength grades of silicate cement are 42.5, 42.5R, 52.5, 52.5R, 62.5, and 62.5R. The strength grades of ordinary cement are 32.5, 32.5R, 42.5, 42.5R, 52.5, and 52.5R. 6 Technical requirements
6.1 Insoluble matter
The insoluble matter in Type 1 Portland cement shall not exceed 0.75%; the insoluble matter in Type 2 Portland cement shall not exceed 1.50%. 6.2 Loss on ignition
! The loss on ignition of Type 1 Portland cement shall not exceed 3.0%, and the loss on ignition of Type 2 Portland cement shall not exceed 3.5%. The loss on ignition of ordinary cement shall not exceed 5.0%.
6.3 Magnesium oxide
The content of magnesium oxide in cement should not exceed 5.0%. If the cement passes the autoclave soundness test, the content of magnesium oxide in the cement is allowed to be relaxed to 6.0%.
6.4 Sulfur trioxide | |tt||The content of sulfur trioxide in cement shall not exceed 3.5%. 6.5 Fineness
The specific surface area of ​​silicate cement shall be greater than 300m2/kg, and the residue on the 80μm square hole sieve of ordinary cement shall not exceed 10.0%. 6.6 Setting time
The initial setting of silicate cement shall not be earlier than 45min, and the final setting shall not be later than 6.5h. The initial setting of ordinary cement shall not be earlier than 45min, and the final setting shall not be later than 10h.
6.7 Anxiety
The boiling method must be used for testing.
6.8 Strength
GB175 1999
Cement strength grades are divided according to the compressive strength and flexural strength at the specified age. The strength of cement of each strength grade at each age shall not be lower than the value in the following table.
Portland cement
Ordinary cement
Strength grade
The alkali content in cement is expressed as the calculated value of Na.0+0.658K,O. If active aggregate is used, when the user requires low-alkali cement, the alkali content in cement shall not be greater than 0.60% or shall be agreed upon by both the supplier and the buyer. 7 Test methods
7.1 Insoluble matter, loss on ignition, magnesium oxide, sulfur trioxide and alkali shall be carried out in accordance with GB/T176.
7.2 Specific surface area
According to GB/T8074. wwW.bzxz.Net
7.3 Fineness
According to GB/T1345.
7.4 Setting time and stability
According to GB/T1346.
7.5 Autoclave stability
According to GB/T750.
7.6 Strength
According to GB/T17671.
8 Inspection rules
Numbering and sampling
Before leaving the factory, cement shall be numbered and sampled according to the same type and strength grade. Bag cement and bulk cement shall be numbered and sampled separately. Each number is a sampling unit. The factory number of cement shall be determined according to the annual production capacity of the cement plant: 21
GB175-1999
Above 1.2 million tons but not exceeding 1,200 tons shall be numbered; above 600,000 tons to 1.2 million tons but not exceeding 1,000 tons shall be numbered; above 300,000 tons to 600,000 tons but not exceeding 600 tons shall be numbered; above 100,000 tons to 300,000 tons but not exceeding 400 tons shall be numbered; below 100,000 tons but not exceeding 200 tons shall be numbered. The sampling method shall be carried out in accordance with GB12573. When the capacity of bulk cement transportation vehicles exceeds the factory's specified tonnage of the factory's ex-factory number, the number is allowed to exceed the specified tonnage of sampling.
Sampling should be representative and can be taken continuously or from more than 20 different parts. The total amount is at least 12kg. The samples taken shall be inspected for ex-factory use according to the methods specified in Chapter 7 of this standard. The inspection items include all technical requirements that need to be assessed for the product.
8.2 Ex-factory cement
Ex-factory cement shall ensure the ex-factory strength grade, and the other technical requirements shall comply with the relevant requirements of this standard. 8.3 Waste and unqualified products
8.3.1 Waste
Any item of magnesium oxide, sulfur trioxide, initial setting time, and stability that does not meet the requirements of this standard shall be considered waste. 8.3.2 Unqualified products
Any product that does not meet the requirements of this standard for fineness, final setting time, insoluble matter and loss on ignition or the amount of mixed materials added exceeds the maximum limit and the strength is lower than the commodity strength grade is considered unqualified. Cement packaging marks that do not include the type of cement, strength grade, producer name and factory number are also considered unqualified products. 8.4 Test report
The test report should include the technical requirements and test results specified in this standard, the names and amounts of grinding aids, industrial by-product gypsum, and mixed materials, and whether they are produced in rotary kilns or vertical kilns. When required by the user, the cement plant should send the test results of all tests except the 28-day strength within 7 days from the date of cement shipment. The 28-day strength value should be reported within 32 days from the date of cement shipment. 8.5 Delivery and acceptance
8.5.1 The quality acceptance of cement at the time of delivery can be based on the physical sample and its inspection results, or on the inspection report of the cement with the same number from the cement plant. The method of acceptance shall be agreed upon by the buyer and seller and shall be indicated in the contract or agreement. 8.5.2 When the inspection results of physical samples are used as the basis for acceptance, the buyer and seller shall jointly take samples and seal them before shipment or at the place of delivery. The sampling method shall be carried out in accordance with GB12573, and the sampling quantity shall be 20kg, which shall be reduced to two equal parts. One part shall be kept by the seller for 40 days, and the other part shall be inspected by the buyer according to the items and methods specified in this standard. Within 40 days, if the buyer finds that the product quality does not meet the requirements of this standard after inspection, and the seller has objections, the two parties shall send the other sample kept by the seller to the provincial or provincial-level nationally recognized cement quality supervision and inspection agency for arbitration inspection. 8.5.3 When the inspection report of the cement with the same number of cement from the cement plant is used as the basis for acceptance, the buyer shall take samples from the cement with the same number before shipment or at the time of delivery, and both parties shall seal and keep them for three months; or entrust the seller to take samples from the cement with the same number, and seal and keep them for three months. If the buyer has any doubts about the quality of cement within three months, the buyer and seller shall send the sealed samples to the provincial or nationally recognized cement quality supervision and inspection agency for arbitration inspection. 9 Packaging, marking, transportation and storage
9.1 Packaging
Cement can be packed in bags or in bulk. The net content of each bag of bagged cement is 50kg and shall not be less than 98% of the marked mass; the total mass of 20 bags randomly selected shall not be less than 1000kg. Other packaging forms shall be determined by negotiation between the supply and demand parties, but the relevant bagging quality requirements must comply with the above principles.
Cement packaging bags shall comply with the provisions of GB9774. 9.2 Marking
GB1751999
The cement bags shall be clearly marked with: product name, code, net content, strength grade, production license number, producer name and address, factory number, implementation standard number, packaging year, month and day. Ordinary cement mixed with volcanic ash admixtures shall also be marked with the words "mixed with volcanic ash". The name and strength grade of cement shall be printed on both sides of the packaging bag. The printing of silicate cement and ordinary cement shall be in red. When transporting in bulk, a card with the same content as the bag mark shall be submitted. 9.3 Transportation and Storage
Cement shall not be exposed to moisture or mixed with foreign objects during transportation and storage. Cement of different types and strength grades shall be stored and transported separately and shall not be mixed. 232 Marking
GB1751999
Cement bags should be clearly marked with: product name, code, net content, strength grade, production license number, producer name and address, factory number, implementation standard number, packaging year, month and day. Ordinary cement mixed with volcanic ash should also be marked with the words "mixed with volcanic ash". The cement name and strength grade should be printed on both sides of the packaging bag. Portland cement and ordinary cement should be printed in red. When transporting in bulk, a card with the same content as the bag mark should be submitted. 9.3 Transportation and storage
Cement must not be exposed to moisture or mixed with foreign objects during transportation and storage. Cement of different types and strength grades should be stored and transported separately and must not be mixed. 232 Marking
GB1751999
Cement bags should be clearly marked with: product name, code, net content, strength grade, production license number, producer name and address, factory number, implementation standard number, packaging year, month and day. Ordinary cement mixed with volcanic ash should also be marked with the words "mixed with volcanic ash". The cement name and strength grade should be printed on both sides of the packaging bag. Portland cement and ordinary cement should be printed in red. When transporting in bulk, a card with the same content as the bag mark should be submitted. 9.3 Transportation and storage
Cement must not be exposed to moisture or mixed with foreign objects during transportation and storage. Cement of different types and strength grades should be stored and transported separately and must not be mixed. 23
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