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GB 2938-2008 English PDF

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GB 2938-2008: [GB/T 2938-2008] Low heat expansive cement
Status: Valid

GB 2938: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
GB 2938-2008	English	189	Add to Cart	3 days [Need to translate]	[GB/T 2938-2008] Low heat expansive cement	Valid	GB 2938-2008
GB 2938-1997	English	279	Add to Cart	3 days [Need to translate]	Low heat expansive cement	Obsolete	GB 2938-1997
GB 2938-1982	English	RFQ	ASK	3 days [Need to translate]	Low heat expansive cement	Obsolete	GB 2938-1982

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Basic data

Standard ID	GB 2938-2008 (GB2938-2008)
Description (Translated English)	[GB/T 2938-2008] Low heat expansive cement
Sector / Industry	National Standard
Classification of Chinese Standard	Q11
Classification of International Standard	91.100.10
Word Count Estimation	7,734
Date of Issue	2008-01-09
Date of Implementation	2008-08-01
Older Standard (superseded by this standard)	GB 2938-1997
Quoted Standard	GB/T 176; GB/T 203; GB/T 1346; GB/T 2022; GB/T 5483; GB/T 8074; GB 9774; GB/T 12573; GB/T 12959; GB/T 17671; JC/T 313; JC/T 420; JC/T 667
Regulation (derived from)	Announcement of Newly Approved National Standards No. 1, 2008 (No. 114 overall)
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China
Summary	This Chinese standard specifies the definition of low thermal expansive cement, material requirements, the intensity to level, technical requirements, test methods, inspection rules, packaging, labeling, transportation and storage. This standard applies to thermal expansion of cement production, inspection and acceptance.

GB 2938-2008: [GB/T 2938-2008] Low heat expansive cement

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Low heat expansive cement ICS 91.100.10 Q11 National Standards of People's Republic of China Replacing GB 2938-1997 Low heat expansive cement Posted 2008-01-09 2008-08-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

The standard Chapter 5, Section 6.1 through 6.8, Chapter 8 is mandatory, the rest are recommended. This standard replaces GB 2938-1997 "Low heat expansive cement." This standard compared with GB 2938-1997 The main changes are as follows. --- Strength cement grade to grade (1997 edition Chapter 5; Chapter 5 of this edition); --- Increased chloride limit requirement that cement the chloride ion content of not more than 0.06% (edition 6.8); --- Cement strength test method by the GB/T 17671 "cement mortar strength test method (ISO method)" instead of GB/T 177-1985 "Cement mortar strength test methods" (1997 Version 6.4; 7.6 edition); --- Test method preserves the heat of hydration of cement GB/T 2022-1980 "Determination of cement hydration heat (direct method)", while increasing the GB/T 12959-1991 "Determination of cement hydration heat (heat of solution method)", using the direct method of arbitration (1997 Version 6.5; this Version 7.4). The standard proposed by China Building Materials Federation. This standard by the National Standardization Technical Committee cement (SAC/TC184) centralized. This standard is drafted by. China Building Materials Academy. Participated in the drafting of this Standard. China Yangtze River Three Gorges Project Development Corporation, Shaanxi Lueyang Xiangshan Cement Co., Ltd., Changjiang Water Resources Yangtze River Scientific Committee, Huaxin Cement Co., Ltd., Yunnan Hongta western Yunnan Cement Company Limited. The main drafters of this standard. Liu, Wang Xianbin, a Greek Bute, Wenwei, Yang Hua whole, Chenwen Yao, Wang Yingchun, Li positive. This standard replaces the standards previously issued as follows. --- GB 2938-1982, GB 2938-1997. Low heat expansive cement

1 Scope

This standard specifies the low thermal expansion of the definition of micro cement, material requirements, strength level, technical requirements, test methods, inspection rules, packaging, Labeling, transport and storage. This standard applies to low thermal expansive cement production, testing and acceptance.

2 Normative references

The following documents contain provisions which, through reference in this standard and become the standard terms. For dated references, subsequent Amendments (not including errata content) or revisions do not apply to this standard, however, encourage the parties to the agreement are based on research Whether the latest versions of these documents. For undated reference documents, the latest versions apply to this standard. GB/T 176 cement chemical analysis method (GB/T 176-1996, eqv ISO 680.1990) GB/T 203 for cement granulated blast furnace slag GB/T 1346 cement standard consistency water, setting time and soundness test method (GB/T 1346-2001, eqv ISO 9597. 1989) GB/T 2022 Determination of cement hydration heat (direct method) GB/T 5483 gypsum and anhydrite (GB/T 5483-1996, eqv ISO 1587. 1975) GB/T 8074 cement specific surface area measuring method (Blaine method) GB 9774 cement packaging bags GB/T 12573 cement sampling method GB/T 12959 Determination of cement hydration heat (heat of solution method) GB/T 17671 cement mortar strength test method (ISO method) (GB/T 17671-1999, idt ISO 679. 1989) JC/T 313 expansive cement expansion test method Chemical analysis of JC/T 420 cement raw material chloride ions JC/T 667 cement grinding aids

3 Terms and Definitions

The following terms and definitions apply to this standard. In granulated blast furnace slag as a main component, adding the right amount of Portland cement clinker and gypsum, low heat of hydration and having a ground made of micro-expansion Performance cement matrix, called Low heat expansive cement, codenamed LHEC.

4 material requirements

4.1 blast furnace slag In line with GB/T 203 provisions of Excellence for granulated blast furnace slag. 4.2 Gypsum Natural gypsum. meet Class A or Class G for more than two gypsum or anhydrite GB/T 5483 regulations. Industrial by-product gypsum. industrial production to calcium sulfate as a byproduct main component. When using industrial by-product gypsum should be tested, certified Ming on the performance of cement harmless. 4.3 Portland cement clinker By the mainly containing CaO, SiO2, Al2O3, Fe2O3 material, and an appropriate proportion of finely pulverized till the partial melting of the resulting calcium silicate-based To hydraulic binder material mineral composition. Wherein the mass fraction of the mineral calcium silicate is not less than 66%, calcium oxide and silicon oxide by mass is not less than 2.0. Clinker intensity level required to achieve 42.5 above; free calcium oxide content (mass fraction) shall not exceed 1.5%; MgO content (mass Volume fraction) should not exceed 6.0%. 4.4 aids Allow cement grinding aids added, the amount should not exceed 0.5% by mass of cement, grinding aids should be consistent with JC/T 667's Provisions. 4.5 Additive Material By the supply and demand sides agreed to allow adding a small amount to improve the performance of cement expansion Additive Material.

5 intensity level

Low heat expansive cement strength rating of 32.5.

6 Technical Requirements

6.1 trioxide Sulfur trioxide content (mass fraction) should be 4.0% to 7.0%. 6.2 The specific surface area The specific surface area of not less than 300m2/kg. 6.3 Setting Time Initial setting no earlier than 45min, the final setting shall not be later than 12h, but also by the production units and the use of units agreed. 6.4 Stability Boiling cooking method should test qualified. 6.5 Strength Compressive strength and flexural strength of cement every age should not be less than the values in Table 1. Table 1 cement grade and age strength power level 32.5 Flexural strength/MPa 7d 28d 5.0 7.0 Compressive strength/MPa 7d 28d 18.0 32.5 6.6 heat of hydration Each age heat of hydration of cement should not be greater than the value in Table 2. Table 2 age heat of hydration of cement power level 32.5 Hydration heat/kJ/kg 3d 7d 6.7 coefficient of linear expansion Coefficient of linear expansion should meet the following requirements. 1d not less than 0.05%; 7d shall not be less than 0.10%; 28d shall not exceed 0.60%. 6.8 Chloride Chloride ion content of cement (mass fraction) shall not exceed 0.06%. 6.9 alkali content Alkali content agreed upon by both parties. Alkali content (mass fraction) Press Na2O + 0.658K2O calculated values.

7 Test methods

7.1 sulfur trioxide (SO3), sodium oxide (N Rao 2O) and potassium oxide (K2O) According to GB/T 176 performed. 7.2 The specific surface area According to GB/T 8074 carried out. 7.3 setting time and soundness According to GB/T 1346 carried out. 7.4 heat of hydration According to GB/T 2022 or GB/T 12959, and adopt the direct method of arbitration. 7.5 coefficient of linear expansion Press JC/T 313 performed, with the following additional provisions. a) by the beginning of the test specimen 24h moisture conservation stripping length measurement, then in water conservation to 1d, 7d, 28d length measurement. b) Final setting time exceeds 12h, moisture curing time by pressing the test specimen after the final setting time 12h First release length measurement. 7.6 Strength According to GB/T 17671 performed. 7.7 Chloride Press JC/T 420 test.

8 Inspection Rules

8.1 Number and sampling Former cement factory by number and species with sampling. Bagged cement and bulk cement should be separately numbered and sampled. Each number is a take Sample units, cement factory numbered no more than 400t is a number. Sampling method according to GB/T 12573 performed. Sampling should be representative. Continuous take, also from more than 20 different parts of the sample taken the same amount of total at least 14kg. Samples taken by the method specified in this standard Chapter 7 factory inspection. 8.2 cement factory Cement factory technical requirements of this standard shall comply with the technical requirements of Chapter 6 6.1 to 6.8. 8.3 determine the rules 8.3.1 Qualified Chapter 6 comply with the standard 6.1 to 6.8 of the technical requirements for qualified products. 8.3.2 nonconforming Any one does not meet the criteria in Chapter 6 6.1 to 6.8 of the technical requirements to be defective. 8.4 Test Report Content test report shall include the technical requirements and test results of this standard, such as the use of aids, industrial by-product gypsum, it should say Clear its name and adding volume. Cement plant should be issued from the date of despatch except 28d 11d and 28d strength linear expansion coefficient of the test in the cement Test results. 28d and 28d strength linear expansion coefficient values should be reported immediately from the date of 32d within the cement.

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