GB/T 17671-2021 PDF English
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Test method of cement mortar strength (ISO method)
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| GB/T 17671-1999 | English | 85 |
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Method of testing cements--Determination of strength
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GB/T 17671-2021: Test method of cement mortar strength (ISO method)---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/GBT17671-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 91.100.10
CCS Q 11
Replacing GB/T 17671-1999
Test method of cement mortar strength (ISO method)
(ISO 679.2009, Cement - Test methods - Determination of strength,
MOD)
Issued on. DECEMBER 31, 2021
Implemented on. JULY 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 4
1 Scope... 8
2 Normative references... 8
3 Terms and definitions... 9
4 Method summary... 9
5 Laboratory and equipment... 9
5.1 Laboratory... 9
5.2 Curing box... 9
5.3 Maintenance pool... 10
5.4 Test cement, Chinese ISO standard sand and water... 10
5.5 Wire mesh test sieve... 10
5.6 Equipment... 10
6 Composition of mortar... 18
6.1 Sand... 18
6.2 Cement... 19
6.3 Water... 19
7 Preparation of mortar... 19
7.1 Mix ratio... 19
7.2 Stirring... 19
8 Preparation of specimen... 20
8.1 Size and shape... 20
8.2 Molding... 20
9 Maintenance of specimen... 21
9.1 Treatment and maintenance before demolding... 21
9.2 Demolding... 21
9.3 Curing in water... 21
9.4 Age of strength test specimen... 22
10 Test procedure... 22
10.1 Determination of flexural strength... 22
10.2 Determination of compressive strength... 23
11 Test results... 24
11.1 Flexural strength... 24
11.2 Compressive strength... 24
12 Acceptance inspection of Chinese ISO standard sand and substitute equipment.. 25
12.1 General... 26
12.2 Acceptance test of Chinese ISO standard sand... 26
12.3 Acceptance test of alternative molding equipment... 30
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document replaces GB/T 17671-1999 "Method of testing cements--Determination
of strength (ISO method)". Compared with GB/T 17671-1999, in addition to the
structural adjustments and editorial modifications, the main technical changes in this
document are as follows.
a) Change the scope. Add circumstances in which this document is not applicable
(see Chapter 1 of this Edition; Chapter 1 of Edition 1999);
b) Write the alternative molding equipment and vibrator side by side (see 5.6.4.2 of
this Edition; 11.7 of Edition 1999);
c) Change the requirements for compressive strength testing machines (see 5.6.6 of
this Edition; 4.2.7 of Edition 1999);
d) Delete the provisions on "single-stage packaging" of China's ISO standard sand.
Add storage requirements (see 6.1.3 of this Edition; 5.1.3 of Edition 1999);
e) Add the provisions that cement samples be "mixed evenly before testing" (see 6.2
of this Edition);
f) Change the water regulations for acceptance testing or disputes (see 6.3 of this
Edition; 5.3 of Edition 1999);
g) Change the forming and smoothing operations (see 8.2.1 of this Edition; 7.2.1 of
Edition 1999);
h) Change the numbering method of specimens (see 8.2.1 of this Edition; 8.1 of
Edition 1999);
i) Add the requirement to cover the test mold with a cover plate during the curing
period of the specimen (see 9.1 of this Edition);
j) Add the requirement that water change shall not exceed 50% during maintenance
(see 9.3 of this Edition);
k) Change the rules for selecting flexural strength data (see 11.1.1 of this Edition;
10.2.1 of Edition 1999);
l) Change the rules for selecting and rounding compressive strength data (see 11.2.1
of this Edition; 10.2.2 of Edition 1999);
m) Delete the provision for qualification of laboratories. Add the provisions for
acceptance testing. Change the out-of-tolerance processing method for
comparative test data. Change the acceptance methods and procedures for China's
ISO standard sand. Add the regulations on the quality report and content of
Chinese ISO standard sand and alternative molding equipment (see Chapter 12 of
this Edition; Chapter 11 of Edition 1999).
The revision of this document adopts ISO 679.2009 "Cement - Test methods -
Determination of strength".
Add the chapter "Terms and definitions" in this document.
Compared with ISO 679.2009, the following structural adjustments are made in this
document.
- Delete normative Annex A and incorporate the provisions regarding alternative
equipment and test procedures into the corresponding provisions of the text.
The technical differences between this document and ISO 679.2009 and their reasons
are as follows.
- Replace international documents with Chinese documents in normative reference
documents. Add the instrument and equipment standards to simplify the
description of instruments and equipment in the text;
- In 11.1.1, add the data processing provisions for flexural strength to clarify the data
processing method for flexural strength.
The following editorial changes have been made to this document.
- To coordinate with the existing standards, the name of the standard is changed to
"Test method of cement mortar strength (ISO method)".
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by China Building Materials Federation.
This document shall be under the jurisdiction of National Technical Committee on
Cement of Standardization Administration of China (SAC/TC 184).
The drafting organizations of this document. China Building Materials Research
Institute Co., Ltd., Xiamen Aisio Standard Sand Co., Ltd., Anhui Conch Cement Co.,
Ltd., Zhejiang Lixian Testing Instrument Manufacturing Co., Ltd., Beijing Guojian
Lianxin Certification Center Co., Ltd., Guangxi Jianke Construction Engineering
Quality Inspection and Evaluation Co., Ltd., Yellow River Survey, Planning and Design
Institute Co., Ltd., Henan Yumei Construction Engineering Inspection Co., Ltd.
Division, Shenzhen Water Engineering Inspection Co., Ltd., Tianjin Yongyang
Construction Engineering Quality Inspection Center, Guangxi Zhuang Autonomous
Region Construction Engineering Quality Inspection Center, Wuxi Jianyi Instrument
Machinery Co., Ltd., Anhui Architectural Research and Design Institute, Hunan
Zhongda Inspection Technology Group Co., Ltd., Hebei Jinyu Dingxin Cement Co.,
Ltd., Wuxi Dongyi Manufacturing Technology Co., Ltd., Zhonghong Inspection and
Certification Group Co., Ltd., Shenzhen Taike Inspection Co., Ltd., Gansu Road and
Bridge Construction Group Co., Ltd., Hebei Jintao Construction Engineering Quality
Inspection Co., Ltd. Company, Sichuan Lisen Building Materials Group Co., Ltd.,
Ningbo Sanjiang Inspection Co., Ltd., Hebei Sanyu Testing Machine Co., Ltd., CNNC
Concrete Co., Ltd., Shenzhen Gangjia Engineering Inspection Co., Ltd., Shenzhen
Jingheng Engineering Inspection Co., Ltd., Weifang Zhengxin Engineering Quality
Inspection Co., Ltd., Chengdu Construction Quality Inspection and Testing Station,
Kunshan Zhengxin Inspection Co., Ltd., Fujian Dali New Building Materials
Technology Co., Ltd., Shanghai Tongji Inspection Technology Co., Ltd., Fujian
Communications Construction Group Engineering Inspection Co., Ltd., Jiangsu
Provincial Transportation Engineering Group Bairun Engineering Inspection Co., Ltd.,
Guangzhou Harbor Engineering Quality Inspection Co., Ltd., Jiangsu Yuheng
Engineering Quality Inspection Co., Ltd., Hubei Provincial Construction Engineering
Quality Supervision, Inspection and Testing Center, Nanjing Fangyuan Construction
Engineering Materials Inspection Center, Sichuan Chengzheng Engineering Inspection
Technology Co., Ltd., Wuhan Huazhong University of Science and Technology Civil
Engineering Inspection Center, Tiezheng Inspection Technology Co., Ltd., Fujian
Transportation Construction Engineering Testing and Inspection Co., Ltd., Gansu
Provincial Building Materials Research and Design Institute Co., Ltd., Guangdong
Nonferrous Industrial Construction Quality Inspection Station Co., Ltd., Shenzhen City
Hengyi Construction Technology Co., Ltd., CCCC Sanhang (Xiamen) Engineering Co.,
Ltd., Xiamen Jiehang Engineering Inspection Technology Co., Ltd., SDIC Engineering
Inspection and Inspection Co., Ltd., Guizhou Provincial Building Materials Product
Quality Inspection and Inspection Institute, Hebei Construction Yanzhu Cheng
Construction Technology Co., Ltd., Shijiazhuang Quzhai Cement Co., Ltd., Shenzhen
Jinpeng Building Decoration Technology Co., Ltd., Sichuan Zhentong Inspection Co.,
Ltd., Zhuhai Zhenye Concrete Co., Ltd., Chongqing Yongyu Inspection and Testing
Technology Co., Ltd., Chongqing University, Qingdao Municipal Building Materials
Research Institute Co., Ltd., Shenzhen University, Hefei University of Technology
Engineering Testing and Inspection Co., Ltd., Nuclear Industry Southwest Construction
Group Co., Ltd., Shanxi Academy of Building Sciences Co., Ltd., Shanxi Fourth
Construction Group Co., Ltd., Shanxi Zhongtiaoshan New Building Materials Co., Ltd.,
China Railway 18th Bureau Group Fourth Engineering Co., Ltd., Xinjiang Honghui
Construction and Building Materials Inspection Co., Ltd.
Main drafters of this document. Xiao Zhongming, Yan Bilan, Liu Chen, Wang Xin, Sun
Zhisheng, Xie Faquan, Shen Yijiong, Fan Yajun, Liang Kai, Li Gen, Li Jinmei, Pan
Xianzhen, Huang Yongmeng, Deng Weijie, Chen Xueliang, Chen Tianyu, Zhang
Wenjie, Yu Yanwei, Ran Shusheng, Yu Baoyan, Li Jiang, Wenjuan, Hua Wei, Chen
Ying, Zhou Fang, Wu Zhenping, Wang Xi, Zeng Chenggang, Cao Zijun, Peng Rongmei,
Zhang Fengmao, Liu Deqiang, Jiang Yijun, Chang Shudong, Tong Xiaoming, Guo
Zhankui, Xiao Mingming, Zhao Xiaoliang, Jin Yongshu, Li Li, Huang Haiyan, Zhao
Hong, Lin Mao, Hu Guo, Wang Mingjun, Wang Shan, Chen Xianyong, Xu Zheng, Shi
Chuanyan, Wei Hougang, Sheng Yun, Wang Kang, Cao Tingwei, Li Xiaohua, Chi
Yuwei, Chen Jinkai, Wu Hongxi, Liu Linsen, Dai Ruifen, Zhang Kai, Shao Jixin, Wang
Liqiang, Ding Ding, Liu Changli, Ren Yuguo, Du Yixiang, Ding Xiaoping, Wang Yong,
Bai Leng, Ye Jianxiong, Mao Yawen, Kuang Yanling, Luo Qiling, Yang Shanwu, Yu Yi,
Chen Yue, Su Yuandong, Zhang Guangdong, Qian Nianwei, Jia Yingze, Li Xi, Hao
Zhihong, Zhao Hui, Li Feng, Zhang Jianzhong, Kong Qingliang, Wang Lei, Li Kai, Pan
Dengyao, Zheng Xu, Zhang Jinshan, Du Yong, Song Lichun, Xi Jinsong, Guo Junping,
Liu Tan, Wen Peiyan.
Versions of standard substituted by this document are.
- It was first issued as GB/T 17671-1999 in 1999;
- This is the first revision.
Test method of cement mortar strength (ISO method)
1 Scope
This document specifies the summary of the method for testing the strength of cement
mortar (ISO method), laboratory and equipment, mortar composition, mortar
preparation, specimen preparation, specimen maintenance, test procedures, test results,
acceptance inspection of Chinese ISO standard sand and substitute equipment.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 6003.1, Test sieves - Technical requirements and testing - Part 1.Test sieves
of metal wire cloth (GB/T 6003.1-2012, ISO 3310-1.2000, MOD)
3 Terms and definitions
There are no terms or definitions to be defined in this document.
4 Method summary
This method is for the determination of the compressive strength and flexural strength
of cement mortar of 40mm×40mm×160mm prism.
When the test age is reached, the specimens are taken out of the water. First use an anti-
folding machine to conduct a flexural strength test.
5 Laboratory and equipment
The temperature of the mold curing specimen curing box shall be maintained at
20℃±1℃. Relative humidity is not less than 90%. The performance and structure of
the curing box shall comply with the requirements of JC/T 959.
6 Composition of mortar
Chinese ISO standard sand shall fully comply with the provisions of 6.1.2 about particle
distribution. Determine by screening of representative samples. The screening test of
each sieve shall be carried out until the throughput per minute is less than 0.5 g.
Cement samples shall be stored in airtight containers. This container shall not react with
cement. Mix well before testing.
7 Preparation of mortar
The mixer for mortar (5.6.2) shall be mixed according to the following procedures. It
can be controlled automatically or manually.
8 Preparation of specimen
Remove the mold sleeve. Remove the test mold from the vibrator. Use a metal straight-
edge ruler (see Figure 3) to rest on one end of the top of the test mold at an angle of
approximately 90° (but slightly inclined toward the scraping direction).
Use a brush or other method to number the specimens. For specimens of more than two
ages, the three specimens in the same test mold shall be divided into two or more ages
when numbering.
9 Maintenance of specimen
Demolding shall be done very carefully. You can use a rubber mallet or ejector to
remove the mold.
Except for specimens aged for 24 h or whose demolding is delayed to 48 h, any aged
specimens shall be taken out of the water in advance before testing (breaking). Wipe
away any deposits on the surface of the specimen. Cover with damp cloth until testing.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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