GB/T 12959-2024_English: PDF (GB/T12959-2024)
| Standard ID | USD | BUY PDF | Lead-Days | Standard Title (Description) | Status |
| GB/T 12959-2024 | 599 |
Add to Cart
|
5 days
|
Test methods for heat of hydration of cement
| Valid |
| GB/T 12959-2008 | 559 |
Add to Cart
|
3 days
|
Test methods for heat of hydration of cement
| Obsolete |
| GB/T 12959-1991 | 399 |
Add to Cart
|
3 days
|
Test method for heat of hydration of cement--The heat of solution method
| Obsolete |
| Standard ID | GB/T 12959-2024 (GB/T12959-2024) | | Description (Translated English) | Test methods for heat of hydration of cement | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q11 | | Classification of International Standard | 91.100.10 | | Word Count Estimation | 30,367 | | Date of Issue | 2024-04-25 | | Date of Implementation | 2024-11-01 | | Older Standard (superseded by this standard) | GB/T 12959-2008 | | Issuing agency(ies) | State Administration for Market Regulation, National Standardization Administration |
GB/T 12959-2024: Method for determination of heat of hydration of cement
ICS 91:100:10
CCSQ11
National Standards of People's Republic of China
Replace GB/T 12959-2008
Method for determination of heat of hydration of cement
Released on 2024-04-25
2024-11-01 Implementation
State Administration for Market Regulation
The National Standardization Administration issued
Table of Contents
Preface III
Introduction V
1 Range 1
2 Normative references 1
3 Terms and Definitions 1
4 Test conditions 2
4:1 Laboratory 2
4:2 Medium temperature 2
4:3 Temperature of materials and utensils 2
5 Materials 2
5:1 Cement 2
5:2 Water 2
5:3 Standard sand 2
6 Isothermal Conduction Calorimetry (Benchmark Method) 2
6:1 Principle of the method 2
6:2 Instruments and Equipment 2
6:3 Isothermal Calorimeter Calibration and Standardization 4
6:4 Test Step 4
7 Heat of solution method (substitute method) 5
7:1 Principle of the method 5
7:2 Reagents and preparation 5
7:3 Instruments and Equipment 6
7:4 Test steps 8
8 Direct method (substitution method) 12
8:1 Principle of the method 12
8:2 Instruments and Equipment 12
8:3 Test steps 13
9 Result Processing 17
10 Accuracy17
10:1 Repeatability 17
10:2 Reproducibility 17
Appendix A (Normative) Calibration of Isothermal Calorimeter 18
Appendix B (Normative) Calibration of Isothermal Calorimeter 20
Preface
This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents"
Drafting:
This document replaces GB/T 12959-2008 "Method for determination of hydration heat of cement": Compared with GB/T 12959-2008, in addition to the structural adjustment
In addition to editorial changes, the main technical changes are as follows:
--- Added isothermal conduction calorimetry and listed it as the reference method (see Chapter 6);
--- Changed the heat of solution method to the alternative method (see Chapter 7, Chapter 3 of the:2008 edition);
--- Added the time requirement for adding mixed acid to the thermos flask when determining the heat of hydration by the heat of solution method (see 7:4:1:3);
--- Added the following information when determining the heat of solution method for slag silicate cement and low-heat slag silicate cement:
Method for calculating the ignition mass of cement for hydration test (see 7:4:2:4);
--- Changed the requirements for re-determination of results by direct method (see 9:1, 4:5:15 of the:2008 edition);
--- Added “Calibration of isothermal calorimeter” (see Appendix A);
--- Added “Calibration of isothermal calorimeter” (see Appendix B):
Please note that some of the contents of this document may involve patents: The issuing organization of this document does not assume the responsibility for identifying patents:
This document was proposed by China Building Materials Federation:
This document is under the jurisdiction of the National Cement Standardization Technical Committee (SAC/TC184):
Company, Beijing Jingangchangdao Engineering Construction Co:, Ltd:, Building Materials Industry Technical Supervision Research Center, China Railway 17th Bureau Group Co:, Ltd:,
Beijing Construction Group Co:, Ltd:, China Railway Construction Technology Testing Co:, Ltd:, Anhui Jinhuang Construction Group Co:, Ltd:, Jiangsu Shanhe Cement Co:, Ltd:
company:
The main drafters of this document are: Guo Junping, Li Xiangquan, Liu Jiwei, Wang Faming, Shen Jing, Wu Qijian, Wang Xinyu, Zhang Yulu, Huang Jianshan, Cui Yong,
Song Shixing, Gao Shenghui, Deng Lei, She Hailong, Zhu Mintao, Liu Tan, Xiao Zhongming, Yin Aiguo, Ding Qingjie, Li Tianyan, Wang Zhengsong, Wang Junyong, Zhang Yanping,
Hu Houlan, Chen Shan, Dong Zhijun, Long Wujian, Ren Hao, Li Guangke, Zhang Chao, Zhang Ping, Gong Ying, Sun Xuemei, Qin Hongzhu, Luo Wei, Chen Xuemei, Wang Yichun,
Zhong Na, Yang Peng, Lü Jungang, Wang Xuechuan, Cai Xueling, Wang Hongxia, Du Zengqiang, Lu Dehua, Sheng Yan, Jin Jianzhou, Yu Yongjin, Li Xudong, Wang Zhizhong,
Ding Xiaoping, Zheng Meichun, Shao Peng, Li Shuyao, Feng Guohua, Bu Yunbing, Du Wei, Xue Mengbin, Xie Haiwang, Wen Xiaoshun, Li Binquan, Hu Yin, Li Hu,
Zhang Shouqi, Chen Bing, Zhao Xuefeng, Kong Haixia, Yang Chunxi, Lu Weijie, You Haishi, Guan Tongqiang, Di Liyu, Chen Feixiang, Yang Xinmin, Chen Peng, Chen Jianfu,
Wang Hao, Hu Mingwen, Wang Lubo, Ke Shanglin, Pang Yi, Li Yameng, Huang Xiaotao, Yu Yuanyuan, Chen Hongwei, Zhen Zhilu, Li Danggang, Tong Lin, Feng Weipeng,
Yan Zhi, Liang Hongtao, Tian Jing, Lei Yingqiang, Liu Qiuhai, Zhang Jiaqing, Ren Lijuan, Li Guyuan, Li Caisi, Cao Jianming:
The previous versions of this document and the documents it replaces are as follows:
---First published in:1991 as GB/T 12959-1991 "Determination of heat of hydration of cement (heat of solution method)";
--- In the first revision in:2008, GB/T 2022-1980 "Test method for heat of hydration of cement (direct method)" was incorporated;
---This is the second revision:
introduction
GB/T 12959-2008 "Methods for determination of cement hydration heat" includes two methods for determination of cement hydration heat: dissolution heat method and direct method:
The heat of solution method is the reference method: Compared with the previous version of the standard, this document includes three methods for determining the heat of cement hydration: isothermal conduction calorimetry,
The calorimetric method and the direct method are used, and the isothermal conduction calorimetry is used as the benchmark method: This is based on the comparison of the three measurement methods:
The results of cement hydration heat are determined with the highest accuracy; in case of dispute, the results of the benchmark method shall prevail; quality control of daily production and application
When making the test, all three methods can be used:
The promulgation and implementation of this document provides market players with an advanced method for determining the heat of cement hydration, while also improving the physical properties of cement testing:
The automation and intelligence level of the test is improved, and the test results can better guide the concrete mixing work: More importantly, the test process is convenient to operate and people
It ensures personal safety and environmental safety, greatly reducing the measurement errors caused by personnel:
Method standards serve product standards: In order to ensure the implementation of this document in conjunction with relevant product standards and specifications, the relevant
Standards and specifications, the version before the implementation of this document is based on the heat of solution method, the relevant standards and specifications after the implementation of this document are based on
Isothermal conduction calorimetry is used as the benchmark: Before the relevant standards and specifications of this document are revised, the specific technical indicators shall be subject to acceptance by both parties:
The negotiated values shall be used as the basis for judgment; after the revision work is completed, the technical indicators of relevant standards and specifications shall be used as the basis for judgment:
Method for determination of heat of hydration of cement
1 Scope
This document describes the test conditions, materials, isothermal conduction calorimetry, heat of solution method, direct method, result processing and other methods for determining the heat of hydration of cement:
Reasoning and accuracy, etc:
This document is applicable to the determination of cement hydration heat: Among them, the isothermal conduction calorimetry is used as the reference method, and the solution heat method and direct method are used as substitutes:
usage:
2 Normative references
The contents of the following documents constitute the essential clauses of this document through normative references in this document:
For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to
This document:
GB/T 176 Chemical analysis methods for cement
GB/T 1346 Test methods for water consumption, setting time and stability of cement of standard consistency
GB/T 6682 Specifications and test methods for water used in analytical laboratories
GB/T 17671 Test method for strength of cement mortar (ISO method)
JC/T 681 Planetary cement mortar mixer
3 Terms and definitions
The following terms and definitions apply to this document:
3:1
baselineoutput
When the test sample cell and the reference sample cell contain test water and reference water with the same heat capacity, the isothermal conduction calorimeter changes with time:
The output signal of the
3:2
Baseline drift
During the measurement, the slope of the linear regression of the baseline output versus the measurement time:
3:3
baselinenoise
The standard deviation of the baseline output over time during the measurement:
3:4
Thermal power
The rate of heat release of the test cement during the measurement period:
3:5
Calibration
Using a heat source with known thermal power, a linear relationship between the automatic acquisition voltage of the data logger and the output thermal power of the isothermal calorimeter is established:
......
GB/T 12959-2008
Test methods for heat of hydration of cement
ICS 91.100.10
Q11
National Standards of People's Republic of China
Replacing GB/T 12959-1991, GB/T 2022-1980
Determination of cement hydration heat
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 reference ASTMC186-1998 "hydraulic cement hydration heat detector method" USA, Japan JISR5203-1987 "cement
Determination of heat of hydration heat of solution method "and the European EN196-8.2003" Determination of heat of hydration heat of solution method ", EN196-9.2003" set
Determination of the amount of heat of hydration semi-adiabatic method ", Russian ΓOCT310.5-1988" cement hydration calorimeter assays direct method "and other test side
Law standards.
This standard replaces GB/T 12959-1991 "Determination of cement hydration heat (heat of solution method)" and GB/T 2022-1980 "cement water
Test method of heat (direct method), "two standards.
The standard heat of solution method compared with the GB/T 12959-1991, the main changes are as follows.
--- The main equipment calorimeter by a monocular to binocular; increased circulating pumps, heating devices, the amount of heat a thermometer, a wide-mouth thermos with
Acid-resistant plastic tube (1991 Edition Chapter 3, edition 3.3);
--- Burning quality from one sample value to modify the results of two samples average value (1991 version 6.2.2, this version 3.5.2.3);
Store --- hydration sample request (this version 3.5.3.3);
--- Standardized test procedures (Chapter 6, 1991 edition, this version 3.5).
The direct method and the standard GB/T 2022-1980 compared to the main changes are as follows.
--- Frustum cylindrical material from the original copper to plastic, kraft paper liner from the original to a thin plastic tube (version 1.1.2 1980, edition 4.3);
--- Determination of thermal capacity constant cooling water to 500g ± 10g (version 1980 4.8, this version 4.5.3.3);
--- Standard sand to test compliance with the size range GB/T 17671 stipulated in (0.5 ~ 1.0) mm in the Sand (1980 version 5.11,
Excerpts 4.2.2);
--- Test gray sand ratio increased from different species, different levels of change in the ratio changed to a fixed ratio of gray sand, cement. sand = 1.3 standard
(1980 version 5.11, this version 4.5.6.4);
--- Mixing method was stirred by hand instead ISO mortar mixer stirring (1980 version 5.13, this version 4.5.7);
--- Original test Mortar amount to weighing 800g ± 1g (1980 version 5.13, this version 4.5.8);
--- Increasing the arbitration test sample distilled water (this version 4.2.3).
The standard proposed by China Building Materials Federation.
This standard by the National Standardization Technical Committee cement (SAC/TC184) centralized.
This standard drafting units. China Building Materials Science Research Institute, China Building Materials Inspection and Certification Center.
Participated in the drafting of this standard. Yunnan Province, building materials product quality supervision and inspection station, Gezhouba Cement Plant Co., Ltd., Sichuan
Top Emeishan Group cement plant, Fushun Cement Co. Ltd., Wu Jinhua Star Cement Limited.
The main drafters of this standard. Zhangqiu Ying, Wang Xu Fang, Huochun Ming, Liu Sheng, Guo Junping, Zhou Guilin, Lijin Qing, Shao Yuan, Shun, Shao water proof.
This standard replaces the previous standard version of the case.
--- GB/T 12959-1991;
--- GB/T 2022-1980.
Determination of cement hydration heat
1 Scope
This standard specifies the principles of cement hydration heat measurement methods, equipment, laboratory conditions, materials, test operation, the result of calculation and
Processing.
This standard applies to heat Portland cement, low heat Portland cement, low heat Portland slag cement, Portland cement, ordinary Portland cement
Mud, slag Portland cement, pozzolan Portland cement, fly ash cement. Other varieties of cement should be determined using the method of solution heat
The varieties of cement temperature readings time.
Dissolved in this standard thermal method as a reference method, the direct method as generation of usage, cement hydration heat measurement results of the reference method of dispute
Prevail.
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 1346-2001 cement standard consistency water, setting time and soundness test method (eqv ISO 9597. 1989)
GB/T 6682 analytical laboratory use specifications and test methods (GB/T 6682-1992, neq ISO 3696. 1987)
GB/T 17671 cement mortar strength test method (ISO method) (GB/T 17671-1999, idt ISO 679. 1989)
JC/T 681 planetary cement mortar mixer
3 heat of solution method (Reference method)
3.1 Principle of the method
This method is based on thermochemical Gass law, only the thermal effect of chemical reaction with the system of initial and final states related with the way reactions no
Off presented. It is under certain conditions calorimeter ambient temperature, with unhydrated cement and cement hydration certain age were certain
Standard acid concentration of dissolved, measured by differential thermal dissolution, the heat of hydration of the cement as the age period evolved.
3.2 Materials, reagents and preparation
3.2.1 The cement specimens shall adopt 0.9mm square hole sieve and mixed thoroughly.
3.2.2 zinc oxide (ZnO)
Used to calibrate the calorimeter heat capacity, the following should be pre-treated before use, zinc oxide into the crucible (900 ~ 950) ℃ under burning
1h burn out, placed in a desiccator to cool, with an agate mortar to grind all through the 0.15mm square mesh, storage backup. Performing heat
Capacity before calibration, the above-prepared zinc oxide should be about 50g at (900 ~ 950) ℃ burning 5min, then cooled to the dryer
Room temperature.
3.2.3 Hydrofluoric acid (HF)
Concentration of 40% (mass fraction) or density (1.15 ~ 1.18) g/cm3.
3.2.4 nitric acid (HNO3)
A large amount should be formulated at a concentration of (2.00 ± 0.02) mol/L of nitric acid solution. When the amount of concentration formulated as a 65% to 68% (mass fraction
Number) or a density of 1.39g/cm3 ~ 1.41g/cm3 (20 ℃) \u200b\u200b138mL of concentrated nitric acid, add distilled water to 1L.
Calibration solution of nitric acid. with the pipette 25mL above a previously prepared solution of nitric acid and transferred to 250mL volumetric flask, using distilled
Diluted with distilled water to the mark, shake. Then sodium hydroxide standard solution of known concentration (approximately 0.2mol/L) Calibration of the nitric acid solution in the flask
Concentration, the concentration is multiplied by 10 is the concentration of the nitric acid solution was prepared well.
......
|