GB/T 200-2017 English PDF (GB/T200-2017)

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GB/T 200-2017: Moderate-heat Portland cement, low-heat Portland cement
GB/T 200-2017
Moderate-heat portland cement, low-heat portland cement
ICS 91.100.10
Q11
National Standards of People's Republic of China
Replacing GB/T 200-2003
Medium heat Portland cement, low heat Portland cement
Published on.2017-12-29
2018-11-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration released
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB/T 200-2003 "medium heat Portland cement, low-heat portland cement, and low-heat slag portland cement." versus
Compared with GB/T 200-2003, the main changes in this standard are as follows.
--- The name of the standard was changed to "medium heat Portland cement, low heat Portland cement";
--- Changed from mandatory standards to recommended standards;
--- Cancellation of "low-heat slag Portland cement" varieties;
---Removal of the composition of low-heat slag portland cement, industrial by-product gypsum, and class A natural gypsum and "grinding aid" in "gypsum" (see
Chapter 4,.2003 Editions 4.1, 4.4 and 4.5);
--- Add M natural gypsum (see 4.3,.2003 edition 4.4);
--- Increase 32.5 strength grade low-temperature Portland cement (see Chapter 5);
--- Increase the technical requirements for insoluble matters in cement (see 6.1.4);
--- Increase the technical requirements for the use of tricalcium aluminate, tricalcium silicate and dicalcium silicate in cement as a selectivity indicator (see 6.3);
--- Increase the technical requirements for 90d compressive strength of low-temperature Portland cement as a type inspection item (see 6.4.5);
--- Modify the mineral composition formula (see Appendix A,.2003 version 4.2.3).
This standard is proposed by China Federation of Building Materials.
This standard is under the jurisdiction of the National Cement Standardization Technical Committee (SAC/TC184).
This standard is drafted by. China Building Materials Research Institute, China Three Gorges Corporation.
Participated in the drafting of this standard. Guodian Dadu River Basin Hydropower Development Co., Ltd., Yalong River Basin Hydropower Development Co., Ltd., and Jiahuate
Cement Co., Ltd., Henan Tongli Cement Co., Ltd., Sichuan Jiahua Jinping Special Cement Co., Ltd., Dalian Cement Group
Co., Ltd., Huaxin Cement Co., Ltd., China Gezhouba Group Cement Co., Ltd., Yangtze River Water Resources Commission, Yangtze River Scientific Research Institute, China Water
Institute of Hydroelectric Science and Technology, Mudanjiang North Cement Co., Ltd., Sichuan Shengsheng Cement Group Co., Ltd., Xiangyun County Building Materials (Group)
Limited Liability Company, Gezhouba Shimen Special Cement Co., Ltd., Fushun Cement Co., Ltd., China Resources Cement Technology R and D Co., Ltd.
Special Cement Group Co., Ltd., Xinjiang Tianshan Cement Co., Ltd., Shannan Yaoyao Group Cobalt Cement Co., Ltd., and Lafarge (Fumin)
Cement Co., Ltd., Sichuan Naito Special Cement Co., Ltd., Shandong Yanzhou Fulai Cement Co., Ltd., and China United Cement Group Co., Ltd.
Division, Anhui Shengyun Environmental Protection (Group) Co., Ltd.
The main drafters of this standard are. Wen Zhaijun, Fan Qixiang, Tu Yangju, Li Wenwei, Ma Zhongcheng, Yan Jun, Sun Minglun, Ma Dongwei, Xu Yigang, and Chen Wei.
Huang Minghui, Luo Lieyu, Hu Limin, Jia Chengqun, Yang Huaquan, Ji Guojin, Xu Helin, Lu Pengfei, Cai Shijie, Wang Yingjun, Yan Jianjun, Kong Xiangzhi,
Cai Pan, Sheng Yong, Zhang Shun, Liu Shengzhong, Liu Shengchao, Zhang Guangfeng, Bai Mingke, Li Jianhai, Feng Xiaodong, Zhang Limei, Li Changjiang, Zhong Wen, Yan Aiping, Wang Jing,
Zhao Qing, Wang Min, Shen Jian, Liu Yun, Xie Renzhi, Wang Xianbin, He Jiangfang, Zhang Faguang, Yan Shiwen, Zhang Houyuan, Li Xihua, Zhao Xuli, Kai Xiaosheng,
Chen College, Huang Guohui, Gao Xianshu, and Zhang Kunyue.
The previous version of the standard replaced by this standard is.
--- GB .200-1963, GB .200-1980, GB .200-1989, GB/T 200-2003.
Medium heat Portland cement, low heat Portland cement
1 Scope
This standard specifies the terms of medium heat Portland cement (hereinafter referred to as medium heat cement) and low heat Portland cement (hereinafter referred to as low heat cement).
And definitions, compositions and materials, code and strength grades, technical requirements, test methods, inspection rules, delivery, delivery and acceptance, packaging, marking, transportation
Loss and storage.
This standard applies to the production and application of medium-heat cement and low-heat cement.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 176 cement chemical analysis method
GB/T 750 cement pressure stability test method
GB/T 1346 cement standard consistency water consumption, setting time, stability test method
GB/T 5483 natural plaster
GB/T 8074 Determination of specific surface area of cement
GB/T 9774 cement packaging bag
GB/T 12573 cement sampling method
GB/T 12959 cement hydration heat measurement method
GB/T 17671 Cement mortar strength test method (ISO method)
3 Terms and Definitions
The following terms and definitions apply to this document.
3.1
Medium heat Portland cement moderate-heatportlandcement
With proper composition of Portland cement clinker, add proper amount of gypsum and grind the hydraulic cementitious material with moderate heat of hydration.
3.2
Low-heat Portland cement low-heatportlandcement
With appropriate composition of Portland cement clinker, add proper amount of gypsum, and grind the hydraulic cementitious material with low heat of hydration.
4 Composition and materials
4.1 Medium-temperature cement clinker
The content of tricalcium silicate (3CaO·SiO2, C3S) in medium-temperature cement clinker is not more than 55.0%, and tricalcium aluminate (3CaO·A12O3,
The content of C3A) is not more than 6.0%, and the content of free calcium oxide (f-CaO) is not more than 1.0%.
4.2 Low-temperature cement clinker
The content of dicalcium silicate (2CaO·SiO2, C2S) in the low-heat cement clinker is not less than 40.0%, and the content of tricalcium aluminate is not more than 6.0%.
The content of free calcium oxide is not more than 1.0%.
4.3 Natural plaster
Natural gypsum conforms to gypsum or mixed gypsum of Class G or M secondary (inclusive) specified in GB/T 5483.
5 Code and Strength Level
Thermal cement, codenamed P·MH, strength class 42.5;
Low-heat cement, codenamed P·LH, is classified into 32.5 and 42.5 grades.
6 Technical Requirements
6.1 Chemical composition
6.1.1 Magnesium Oxide (MgO)
The content of magnesium oxide in cement (mass fraction) is not more than 5.0%.
If the cement passes the pressure steam stability test, the content of magnesium oxide in the cement (mass fraction) is allowed to relax to 6.0%.
6.1.2 Sulphur Trioxide (SO3)
The content of sulfur trioxide in cement (mass fraction) is not more than 3.5%.
6.1.3 Loss on ignition (LOI)
Loss on ignition (mass fraction) of cement is not more than 3.0%.
6.1.4 Insolubles (IR)
The insoluble content in cement (mass fraction) is not more than 0.75%.
6.2 alkali content (selectivity index)
Alkali content is calculated as Na2O 0.658 K2O. If active aggregates are used, the user asks for low-alkali cement.
The alkali content should not exceed 0.60% or be negotiated between the buyer and the seller.
6.3 Tricalcium Silicate, Dicalcium Silicate and Tricalcium Aluminate (Selective Index)
When requested by the user, the content of tricalcium silicate (C3S), dicalcium silicate (C2S) and tricalcium aluminate (C3A) in cement shall meet the requirements of Table 1.
Or determined by the buyer and the seller.
Table 1 Content of tricalcium silicate, dicalcium silicate, and tricalcium aluminate in cement
Variety C3S/% C2S/% C3A/%
Medium heat cement ≤55.0 - ≤6.0
Low-heat cement - ≥40.0 ≤6.0
6.4 Physical properties
6.4.1 Specific surface area
The specific surface area of cement is not less than 250m2/kg.
6.4.2 Setting time
The initial setting time is not less than 60 minutes and the final setting time is not greater than 720 minutes.
6.4.3 Boil stability
Boiling stability is qualified.
6.4.4 Intensity
The strengths of cements 3d, 7d and 28d should meet the requirements of Table 2.
Table 2 Strength indexes of cement 3d, 7d and 28d
Variety
strength
grade
Compressive strength
MPa
Flexural strength
MPa
3d 7d 28d 3d 7d 28d
Medium heat cement 42.5 ≥12.0 ≥22.0 ≥42.5 ≥3.0 ≥4.5 ≥6.5
Low-temperature cement
32.5 - ≥10.0 ≥32.5 - ≥3.0 ≥5.5
42.5 - ≥13.0 ≥42.5 - ≥3.5 ≥6.5
6.4.5 90d compressive strength of low thermal cement
The compressive strength of low-heat cement for 90 days is not less than 62.5 MPa.
6.4.6 Heat of hydration
The hydration heat of cement 3d and 7d should meet the requirements of Table 3.
Table 3 Hydration Heat Indexes of Cement for 3d and 7d
Variety intensity level
Heat of hydration
kJ/kg
3d 7d
Medium heat cement 42.5 ≤ 251 ≤ 293
Low-temperature cement
32.5 ≤ 197 ≤ 230
42.5 ≤230 ≤260
6.4.7 Low heat cement 28d heat of hydration
The heat of hydration of grade 32.5 low-heat cement 28d is less than 290kJ/kg, and the heat of hydration of 42.5 grade low-heat cement 28d 28d/kg.
7 Test methods
7.1 Calcium oxide, silicon dioxide, aluminum oxide, iron oxide, magnesium oxide, sulfur trioxide, loss on ignition, insolubles, free calcium oxide, oxidation
Sodium and potassium oxide
Calcium oxide, silicon dioxide, aluminum oxide, iron oxide, magnesium oxide, sulfur trioxide, loss on ignition, insolubles, free calcium oxide, oxidation
Sodium and potassium oxide were tested according to GB/T 176.
7.2 Tricalcium aluminate, tricalcium silicate and dicalcium silicate in clinker or cement
In the clinker or cement, tricalcium aluminate, tricalcium silicate and dicalcium silicate are prepared according to Appendix A.
7.3 Specific surface area
The specific surface area is tested according to GB/T 8074.
7.4 Setting time and boiling stability
The setting time and boiling stability were tested according to GB/T 1346.
7.5 Pressure stability
Pressure steam stability according to GB/T 750 test.
7.6 Intensity
The strength is tested according to GB/T 17671.
7.7 Heat of hydration
Hydration heat according to GB/T 12959 test.
8 Inspection Rules
8.1 Batch and sampling
8.1.1 Group Batch
The cement is batched and sampled according to the same species before leaving the factory. Bulk cement and bulk cement should be batched and sampled separately. Each lot number is
One sampling unit. Cement factory does not exceed 600t for a batch number.
8.1.2 Sampling method
Sampling according to the provisions of GB/T 12573, sampling should be representative, continuous sampling can also be taken in more than 20 locations
Product, the total amount of at least 14kg.
8.2 Cement Inspection
8.2.1 Factory inspection
The factory inspection project shall include the technical requirements specified in 6.1, 6.4.1, 6.4.2, 6.4.3, 6.4.4, and 6.4.6.
8.2.2 Type Inspection
Type test items are all the technical requirements specified in 6.1, 6.4.
One of the following situations should be checked.
--- Major changes in raw materials and processes may affect product performance;
--- After trial production of new products or products are suspended for a long period of time, when production resumes;
--- When the factory inspection results are significantly different from the last type inspection;
--- Test once a year during normal production.
8.3 Decision Rules
8.3.1 Factory inspection
8.3.1.1 The inspection results are qualified products that meet the technical requirements of 6.1, 6.4.1, 6.4.2, 6.4.3, 6.4.4, and 6.4.6.
8.3.1.2 Inspection results that do not meet any of the technical requirements of 6.1, 6.4.1, 6.4.2, 6.4.3, 6.4.4, and 6.4.6 are nonconforming products.
8.3.2 Type Inspection
The test results meet the technical requirements specified in 6.1, 6.4 are qualified products. The inspection result does not meet any of the technical requirements in 6.1 and 6.4.
Seeking for defective products.
8.4 Inspection Report
The content of the inspection report includes at least the cement type, strength grade, various technical requirements specified in this standard and test results. Producers should be
The results of the tests specified in addition to the 28d strength shall be sent within 11 days from the date of delivery of the cement. 28d strength value should be issued in cement
Compensate within 32 days from date.
9 Factory, delivery and acceptance
9.1 Factory
Only after confirming that the cement's technical specifications and packaging quality meet the requirements, can it leave the factory.
9.2 Delivery and Acceptance
9.2.1 The quality acceptance of cement at the time of delivery may be based on the inspection result of the physical sample, or the inspection of the cement of the same batch as the producer.
The report is based on. The acceptance method adopted by the buyer and the seller is agreed upon and specified in the contract or agreement. The seller has informed the buyer of the acceptance method
Responsibility. Where there is no written contract or agreement, or the acceptance method is not specified in the contract or agreement, the seller shall indicate on the invoice that
The batch cement inspection report is based on acceptance.
9.2.2 When the inspection result of the physical sample is taken as the acceptance basis, the buyer and the seller shall jointly sample and seal the goods before delivery or at the place of delivery. take
Sample method according to GB/T 12573, the number of samples is 28kg, shrink into two equal parts. One save by the seller for 40 days, one for the buyer
The items and methods specified in the standard are tested.
Within 40 days, if the buyer's inspection believes that the product quality does not meet the requirements of this standard, and the seller has another objection, both parties sha...