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GB/T 12960-2007 PDF in English


GB/T 12960-2007 (GB/T12960-2007, GBT 12960-2007, GBT12960-2007)
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GB/T 12960-2007: PDF in English (GBT 12960-2007)

GB/T 12960-2007
GB
NATIONAL STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 12960-1996
Quantitative determination of constituents of cement
ISSUED ON. MARCH 26, 2007
IMPLEMENTED ON. OCTOBER 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 5 
4 Basic requirements for test ... 6 
5 Reagent ... 7 
6 Instruments ... 11 
7 Sample preparation ... 15 
8 Determination of cement constituent in Portland cement and common
Portland cement ... 16 
9 Determination of constituent content in slag silicate cement ... 26 
10 Determination of constituents in volcanic silicate cement or fly ash silicate
cement ... 30 
11 Determination of constituent content in complex silicate cement ... 32 
12 Allowable difference ... 36 
Foreword
This standard replaces GB/T 12960-1996 “Quantitative determination of
constituents of cement”.
This standard, through modification, adopts the ENV 196-4.1989 “Test
methods for cement - Quantitative determination of constituents” European
Standard Draft (English version) and the carbon dioxide determination method
(English version) in EN 196-2.2005 “Test methods for cement - Cement
chemical analysis” European standard.
As compared with GB/T 12960-1996, the main changes of this standard are as
follows.
- MODIFY the relevant determination conditions for the selective dissolution
methods.
a) As for the selective dissolution conditions for hydrochloric acid solution,
MODIFY the water addition from 50 mL to 80 mL (Clause 8.2.1.2 of
this version; Clause 6.2.5 of 1996 version);
b) When preparing the EDTA solution, INCLUDE the sodium hydroxide in
EDTA solution (Clause 5.12 of this version; Clause 6.1.3.4 and 6.1.3.5
of 1996 version);
c) As for the EDTA solution selective dissolution conditions, CANCEL the
addition of sodium hydrogen phosphate solution and sodium
hydroxide solution, and MODIFY the water addition from 25 mL to 80
mL (Clause 8.2.2.3 of this version; Clause 6.1.5 of 1996 version).
- In accordance with the type of cement (Portland cement and common
Portland cement, slag Portland cement, pozzolanic Portland cement or fly
ash Portland cement, compound Portland cement), respectively
PROVIDE the determination method and calculation formula of
constituents.
- ADD the reference method (Clause 8.3.4, 9.2.3, 10.2.2 and 11.2.4 of this
version).
- In the alternative method, in accordance with the different modes of
production of cement, respectively PROVIDE the calculation formula of
constituents (Clause 8.3.5, 9.2.4, 10.2.3 and 11.2.5 of this version;
Clause 6.1.6.2; 6.2.6.2; 7.5.4.3 and 7.5.4.4 of 1996 version).
- ADD the asbestos absorption gravimetric method for the determination of
carbon dioxide content (Clause 6.8 and 8.2.3.1 of this version).
- As for the potassium hydroxide-ethanol titration method, CHANGE the
sulfuric acid decomposition of the sample into phosphoric acid
decomposition of the sample (Clause 8.2.3.2 of this version; Clause 6.3
of 1996 version).
This standard was proposed by the China Building Materials Industry
Association.
This standard shall be under the jurisdiction of the National Cement
Standardization Technical Committee (SAC/TC 184).
The drafting organizations of this standard. China Building Materials Research
Institute China Building Materials Inspection and Certification Center.
The main drafters of this standard. Wang Ruihai, Ni Zhujun, Yan Weizhi, Xin
Zhijun, Zheng Zhaohua, Cui Jian, Chen Xuhong, Zhang Jing.
This Standard replaces the standard previously issued as follows.
- GB/T 12960-1991, GB/T 12960-1996.
- GB/T 12961-1991.
Quantitative determination of constituents of cement
1 Scope
This standard specifies the quantitative determination of constituents of
cement.
This standard applies to the determination of the common Portland cement
(Portland cement, common Portland cement, slag Portland cement, pozzolanic
Portland cement, fly ash Portland cement, and compound Portland cement).
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 176 Method for chemical analysis of cement (GB/T 176-1996, eqv
ISO 680.1990)
GB/T 2007.1 General rules for the sampling and sample preparation of
minerals in bulk - Manual method of sampling
GB/T 5484 Methods for chemical analysis of gypsum
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB 12573 Sampling method for cement
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Reference method
A method of correcting constituent content calculation result using mixed
materials actually mixed with cement and insoluble slag content in Portland
cement (P • I) sample.
3.2
Alternative method
The method of constituent content calculation by using the statistical
average value of the insoluble slag of the Portland cement (P • I) in
hydrochloric acid solution and EDTA solution, in accordance with the
different modes of production of cement to give the calculation formula of
constituent, respectively.
4 Basic requirements for test
4.1 Number of tests
The number of tests for each determination is specified twice AND the
determination results are expressed as the average of two tests.
4.2 Laboratory temperature
The laboratory temperature for the determination of insoluble slag content of
the hydrochloric acid solution after the selective dissolution and the EDTA
selective dissolution shall be between 15 °C ~ 30 °C.
4.3 Constant
After the first drying, cooling, and weighing, the continuous drying for 15 min
for each time and cooling and weighing are used to check the constant mass;
AND when the difference between two continuous weighing is less than
0.0005 g, the constant is reached, unless otherwise specified.
4.4 Representation of mass, volume, and titer
USE “gram (g)” to indicate mass, accurate to 0.0001 g. The volume of the
burette is expressed in milliliters (mL), accurate to 0.05 mL. The unit of titer is
expressed in “milligrams per milliliter (mg/mL)”, AND four significant digits are
retained after rounding off of the titer.
4.5 Results processing
4.5.1 The content of the insoluble slag, carbon dioxide, and sulfur trioxide after
selective dissolution is expressed in mass fraction, AND the value is expressed
in percentage (%) to two decimal places.
4.5.2 The determination result of the content of each constituent is in mass
fraction, AND the value is expressed in percentage (%) to one decimal place.
4.5.3 If the content of a certain determined constituent is less than or equal to
1.0%, then the content of this constituent is deemed as zero; in the calculation
of the other constituent content, if the content of this constituent is used, then it
is used for calculation as zero; AND as for the constituent content more than
1.0%, it shall not deduct the 1.0% to represent the results.
5 Reagent
Reagents used shall be no lower than analytical pure, unless otherwise stated.
The reagent used for calibration shall be the reference reagent. The water
used shall comply with the level III water requirements as specified in GB/T
6682.
The density of commercially available concentrated liquid reagents as listed in
this standard refers to the density (ρ) at 20 ° C, in grams per cubic centimeter
(g/cm3). In chemical analysis, the acid used refers to the commercially
available concentrated acid unless otherwise the concentration is indicated.
The volume ratio is used to represent the reagent dilution degree. For example.
Hydrochloric acid (1 + 2) means that 1 part by volume of concentrated
hydrochloric acid is mixed with 2 parts by volume of water.
5.1 Hydrochloric acid (HCl)
Density of 1.18 g/cm3 ~ 1.19 g/cm3 AND mass fraction of 36% ~ 38%.
5.2 Sulfuric acid (H2SO4)
Density of 1.84 g/cm3 AND mass fraction of 95% ~ 98%.
5.3 Phosphoric acid (H3PO4)
Density of 1.68 g/cm3 AND mass fraction ≥ 85%.
5.4 Triethanolamine [N(CH2CH2OH)3]
Density of 1.12 g/cm3 AND mass fraction of 99%.
5.5 Ethanol (C2H5OH)
Volume fraction of 95% or anhydrous ethanol.
5.6 Ethylenediamine(NH2CH2CH2NH2)
Volume fraction of ...
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.