GB/T 12960-2019 PDF English
US$210.00 · In stock · Download in 9 secondsGB/T 12960-2019: Quantitative Determination of Constituents of Cement Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 12960: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 12960-2019 | English | 210 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Quantitative Determination of Constituents of Cement
| Valid |
| GB/T 12960-2007 | English | 160 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Quantitative determination of constituents of cement
| Obsolete |
| GB/T 12960-1996 | English | 479 |
Add to Cart
|
4 days
|
Method for determining the contents of constituents of cement
| Obsolete |
| GB/T 12960-1991 | English | RFQ |
ASK
|
3 days
|
Method for determination of blast-furnace slag content in cement
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 12960-2019
GB/T 12960-2019: Quantitative Determination of Constituents of Cement---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT12960-2019
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
Q 11
Replacing GB/T 12960-2007
Quantitative Determination of Constituents of Cement
Issued on. OCTOBER 18, 2019
Implemented on. SEPTEMBER 1, 2020
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative References... 5
3 Basic Requirements for Test... 5
4 Reagents and Materials... 6
5 Instruments and Equipment... 8
6 Preparation of Specimens... 11
7 Determination of Cement Constituents - Method 1... 11
8 Determination of Cement Constituents - Method 2... 18
9 Precision... 22
1 Scope
This Standard specifies the methods of quantitative determination of constituents of
Portland cement, ordinary Portland cement, slag Portland cement, pozzolanic Portland
cement, fly-ash Portland cement and composite Portland cement.
This Standard is applicable to cement containing one or more materials among
granulated blast-furnace slag, pozzolanic mixed material, fly ash, limestone,
sandstone, kiln dust, gypsum and Portland cement clinker.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 176 Method for Chemical Analysis of Cement
GB/T 5484 Methods for Chemical Analysis of Gypsum
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
GB/T 8170 Rules of Rounding off for Numerical Values & Expression and Judgement
of Limiting Values
3 Basic Requirements for Test
3.1 Test Number and Requirements
The number of tests for each determination is specified as two. Use the average value
of two test results to represent the determination result.
3.2 Laboratory Temperature
It is required that laboratory temperature shall be between 16 °C ~ 30 °C.
3.3 Constant Mass
After the first drying or burning, cooling and weighing, through the method of
continuously drying or burning the vessel or specimen for 15 min each time, and then,
cooling and weighing it, determine the constant mass. When the difference of two
consecutive weighings is less than 0.0005 g, it reaches a constant mass.
3.4 Processing of Results
4 Reagents and Materials
Unless it is otherwise specified, all reagents shall be not lower than analytically pure.
The used water shall be not lower than the requirements for Grade-3 water specified
in GB/T 6682.Carbon dioxide-free water refers to water that is freshly boiled and
cooled to room temperature.
4.1 Nitric acid (HNO3). density. 1.39 g/cm3 ~ 1.41 g/cm3; mass fraction. 65% ~ 68%.
4.2 Sulfuric acid (H2SO4). density. 1.84 g/cm3; mass fraction. 95% ~ 98%.
4.3 Phosphoric acid (H3PO4). density. 1.68 g/cm3; mass fraction ≥ 85%.
4.4 Triethanolamine [N(CH2CH2OH)3]. density. 1.12 g/cm3; mass fraction. 99%.
4.5 Ethanol (C2H5OH). mass fraction. 95%.
4.6 Nitric acid (1 + 5).
NOTE 1.use volume ratio to indicate the degree of reagent dilution, the same below. Nitric
acid (1 + 5) means that 1 volume of concentrated nitric acid is mixed with 5
volumes of water.
4.10 Phosphate pH standard buffer solution. weigh-take 2.238 g of disodium hydrogen
phosphate (Na2HPO4 12H2O) and 0.851 g of potassium dihydrogen phosphate
(KH2PO4), accurate to 0.0001 g. Place it in a 200 mL beaker; add about 100 mL of
carbon dioxide-free water. Warm and stir it, so as to dissolve it. Then, cool it to room
temperature; transfer it to a 250 mL volumetric flask. Use carbon dioxide-free water to
wash the beaker and dilute to the scale, then, shake it well. The pH values of
phosphate pH standard buffer solution at different temperatures are shown in Table 1.
Table 1 -- pH Values of Standard Buffer Solution
4.16 Anhydrous magnesium perchlorate [Mg (ClO4)2]. made into a particle size of 0.6
mm ~ 2 mm; stored in a sealed bottle.
5 Instruments and Equipment
5.1 Balance. division value is not less than 0.0001 g.
5.2 Drying oven. controlled temperature 105 °C ± 5 °C, 150 °C ± 5 °C.
5.3 Acidity meter. pH value measurement value 0 ~ 14, accurate to 0.02.
5.4 Glass sand core funnel. with a diameter of 35 mm ~ 60 mm; model G4 (average
pore size. 3 μm ~ 4 μm).
5.5 Suction filter flask. 1,000 mL.
5.6 Air pump. pumping speed 0.25 L/s.
5.10 High-temperature furnace, controlled temperature 580 °C ± 20 °C, 950 °C ± 25 °C.
5.11 Desiccator. internally hold color-changing silica gel.
5.12 Porcelain crucible, with a lid, capacity. 20 mL ~ 30 mL.
6 Preparation of Specimens
Cement specimens shall be sampled in accordance with the method of GB/T 12573.
7 Determination of Cement Constituents - Method 1
7.1 Principle
In terms of pozzolanic mixed material or fly-ash constituent, adopt the selective
dissolution method. Use nitric acid solution for the selective dissolution of cement
specimen. The pozzolanic mixed material or fly-ash constituent is basically insoluble,
while the other constituents are basically dissolved.
7.2 Test Procedures
7.2.1 Determination of insoluble slag content after selective dissolution with
nitric acid solution
7.3 Processing of Test Result
7.3.1 Calculation of insoluble slag content after selective dissolution with nitric
acid solution
The insoluble slag content (a) in cement after selective dissolution with nitric acid
solution shall be calculated in accordance with Formula (1).
8 Determination of Cement Constituents - Method 2
8.1 Principle
In terms of granulated blast-furnace slag constituent, adopt the sulfide determination
method. The determination of sulfide adopts the iodometric method. If granulated blast-
furnace slag with a relatively low sulfide content is used, or, other mixed materials in
cement have a relatively high sulfide content, the error of the determination of
granulated blast-furnace slag constituent through the sulfide determination method
might be relatively large.
8.2 Test Procedures
8.2.1 Determination of sulfide in cement and sulfide content in EDTA insoluble
slag
The determination of sulfide content (S1) in cement shall be conducted in accordance
with GB/T 176.
8.2.3 Determination of carbon dioxide - infrared analysis method
In terms of the determination of carbon dioxide (D2) through the infrared analysis
method, weigh-take about 0.05 g of specimen, accurate to 0.0001 g; directly place it
on a platinum dish and conduct the determination in accordance with GB/T 35151.
8.2.4 Determination of carbon dioxide - automatic photoelectric titration method
In terms of the determination of carbon dioxide (D3) through the automatic photoelectric
titration method, conduct the determination in accordance with GB/T 5484.
8.2.5 Determination of gypsum constituent - X-ray diffraction analysis method
In accordance with the specific requirements in the instructions of the instrument,
conduct the determination.
8.3 Processing of Test Result
9 Precision
9.1 Repeatability
Under repeatability conditions, when the methods listed in this Standard are used to
analyze the same specimen, the difference between the two analysis results shall be
within the listed repeatability limits (see Table 2).
9.2 Reproducibility
Under reproducibility conditions, when the methods listed in this Standard are used to
respectively analyze the same specimen, the difference between the average values
of the analysis results shall be within the listed reproducibility limits (see Table 2).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 12960-2019 be delivered?Answer: The full copy PDF of English version of GB/T 12960-2019 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 12960-2019_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 12960-2019_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 12960-2019 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. Question 5: Should I purchase the latest version GB/T 12960-2019?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 12960-2019 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 12960-2019?A step-by-step guide to download PDF of GB/T 12960-2019_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 12960-2019".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|