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GB/T 750-2024: Test method for autoclave expansion of cement Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid GB/T 750: Historical versions
GB/T 750-2024: Test method for autoclave expansion 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/GBT750-2024GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 91.100.10 CCS Q 11 Replacing GB/T 750-1992 Test Method for Autoclave Expansion of Cement Issued on. OCTOBER 26, 2024 Implemented on. MAY 1, 2025 Issued by. State Administration for Market Regulation; Standardization Administration of the People’s Republic of China. Table of ContentsForeword... 3 1 Scope... 6 2 Normative References... 6 3 Terms and Definitions... 6 4 Method Principle... 7 5 Instruments and Equipment... 7 6 Materials... 9 7 Test Conditions... 9 8 Molding and Curing of Specimens... 10 9 Measurement of Specimen Length... 11 10 Autoclave of Specimen... 11 11 Calculation and Evaluation of Results... 13 Appendix A (Normative) Test Method of 25mm×25mm×146mm specimen... 15 Appendix B (Normative) Safety Precautions... 19ForewordThis Document was drafted as per the rules specified in GB/T 1.1-2020 Directives for Standardization – Part 1.Rules for the Structure and Drafting of Standardizing Documents. This Document replaced GB/T 750-1992 Method for Soundness of Portland Cement. Compared with GB/T 750-1992, the major technical changes of this Document are as follows besides structural adjustments and editorial modifications. a) Change the requirements for mixers (see 5.1 of this Edition; 5.2 of the 1992 Edition); b) Change the requirements for test molds (see 5.2 of this Edition; 5.1 of the 1992 Edition); c) Change the requirements for autoclaves (see 5.5 of this Edition; 5.4 of the 1992 Edition); d) Add the requirements for temperature measuring devices (see 5.6 of this Edition); e) Change the requirements for comparators (see 5.8 of this Edition; 5.1 of the 1992 Edition); f) Delete the requirements for the boiling stability of the specimen (see 6.2 of the 1992 Edition); g) Change the molding operation steps for the specimen (see 8.3 of this Edition; 8.3 of the 1992 Edition); h) Delete the boiling steps for the specimen (see Clause 9, A.4 of the 1992 Edition); i) Add the operating steps for sealing the autoclave (see 10.1 of this Edition); j) Change the autoclave operation procedure for the specimen (see Clause 10 of this Edition; Clause 10 of the 1992 Edition); k) Change the conformity assessment (see 11.3 of this Edition; 11.2 of the 1992 Edition). Please note some contents of this Document may involve patents. The issuing agency of this Document shall not assume the responsibility to identify these patents. 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). Drafting organizations of this Document. China Building Materials Academy Co., Ltd.; Nanping Wusha Expressway Co., Ltd.; Anhui Conch Cement Company Limited; China Railway Construction Group East China Engineering Co., Ltd.; China Three Gorges Construction Engineering Corporation; Wafangdian Jianke Experimental Instrument Manufacturing Co., Ltd.; Yunnan Building Materials Product Quality Inspection Institute; Ningxia Zhongce Metrology Testing and Inspection Institute (Co., Ltd.); Xinjiang Hengtai Zhuyuan New Building Materials Co., Ltd.; Hubei Water Resources Research Institute; JSTI Group Co., Ltd.; Alaer Zhejian New Building Materials Group Co., Ltd.; China Railway Construction Group Co., Ltd.; Jiangshan Hejiashan Cement Co., Ltd.; Jiangsu Hengshan Southern Cement Co., Ltd.; Gezhouba Yicheng Cement Co., Ltd.; Fuzhou University; Chendu Institute of product Quality Inspection Co., Ltd.; China Communications (Guangzhou) Construction Co., Ltd.; Shandong Junhong Environmental Protection Technology Co., Ltd.; Jiangxi Building Materials Research and Design Institute Co., Ltd.; Inner Mongolia Jidong Cement Co., Ltd.; Yinan Zhonglian Cement Co., Ltd.; Rizhao Urban Investment Group Construction Development Co., Ltd.; Shanghai Research Institute of Building Sciences Co., Ltd.; Shaanxi Zhengchuang Engineering Testing Co., Ltd.; Anhui Kaiyuan Road and Bridge Co., Ltd.; CCCC Road Construction Transportation Technology Co., Ltd.; Ningxia Shizuishan Saima Cement Co., Ltd.; China Construction Third Bureau First Engineering (Sichuan) Co., Ltd.; Poly Changda Engineering Co., Ltd.; Guangzhou First Municipal Engineering Co., Ltd.; Beijing Lujianhongxing Construction Quality inspection & Testing Co., Ltd.; Xi’an Tieyiyuan Engineering Test and Inspection Co., Ltd.; Gansu Transportation Planning, Survey and Design Institute Co., Ltd.; Fujian Water Conservancy and Hydropower Survey and Design Institute Co., Ltd.; Changzhou Architectural Research Institute Group Co., Ltd.; Beijing Municipal Construction Engineering Quality the First Detection Co., Ltd.; China Railway 11th Bureau Goup Bridge Co., Ltd.; Huahai Engineering Co., Ltd. Of CREC Shanghai; China Railway 15th Bureau Group Third Engineering Co., Ltd.; Tangshan Jidong Qixin Cement Co., Ltd.; Guangdong Zhongyuelian Construction Co., Ltd.; Jinzhongtian Construction Group Co., Ltd.; Shanxi Transportation Technology Research & Development Co., Ltd.; Hunan Hydro & Power Design Institute Co., Ltd.; Shandong Hi-Speed Engineering Consulting Group Co., Ltd.; Xiyuefa International Environmental Protection New Materials Co., Ltd.; China Railway 22nd Bureau Group Frist Engineering Co., Ltd.; Gezhouba Songzi Cement Co., Ltd.; Shanxi Yijian Group Co., Ltd.; China Railway 15th Bureau Group Fifth Engineering Co., Ltd.; CCCC Second Harbor Engineering Company Ltd.; China Railway 6th Bureau Group Fengqiao Bridge Co., Ltd.; CSCEC Xinjiang Construction Engineering Group the 3rd Construction Engineering Co., Ltd.; Tangxian Jidong Cement Co., Ltd.; Anhui Provincial Construction Engineering Quality Supervision and Inspection Station Co., Ltd.; Guoneng (Shandong) Energy and Environment Co., Ltd.; China Railway Engineering Design Consulting Group Co., Ltd.; China West Construction Group Co., Ltd.; Anhui Heda Engineering Testing Co., Ltd.; China Railway 20th Bureau Group Second Engineering Co., Ltd.; Quzhou Kangping Construction Engineering Testing Co., Ltd.; CBMI Construction Co., Ltd.; The Third Construction Engineering Co., Ltd. Of China Construction Second Engineering Bureau; China Construction Second Engineering Bureau LTD; Sichuan Province Heli Construction Quality Detection and Appraisement & Project Consulting Co., Ltd.; The Second Construction Engineering Co., Ltd. Of China Construction Second Engineering Bureau; The 4th Engineering Co., Ltd. Of China Railway 22nd Bureau Group; Liaoning Provincial Transportation Planning and Design Institute Co., Ltd.; China Construction Sixth Engineering Bureau Corp., Ltd.; China Construction 8th Engineering Bureau Testing Technology Co., Ltd.; Luopu Tianshan Cement Co., Ltd.; Tiezheng Testing Technology Co., Ltd.; Shanghai Investigation, Design & Research Institute Co., Ltd.; Jiangxi Academy of Water Science and Engineering; Shanghai Construction Engineering (Zhejiang) Water Conservancy and Hydropower Construction Co., Ltd.; Hangzhou Smart Building Materials Technology Co., Ltd.; China Construction Third Engineering Bureau Urban Construction Co., Ltd.; China Communications 2nd navigation Bureau 2nd Engineering Co., Ltd.; Fujian Hengshi Construction Development Co., Ltd.; China MCC22 Group Corporation Ltd.; China State Construction Hailong Technology Company Limited; Wuxi Xiyi Building Materials Instrument Factory; and The 1st Construction Co., Ltd. of China Railway Construction 15th Group. Chief drafting staffs of this Document. Liu Chen, Mu Honglin, Li Leyi, Xie Faquan, Qin Hao, Yi Jie, Zheng Xu, Zhang Weijun, He Lijuan, Zhou Jianhua, Zhu Zhenggui, He Runzhi, Jiang Zhengwei, Wu Ruli, Zhang Rongsheng, Wang Xufang, Yin Xiangnan, Zeng Zheng, Shen Dongmei, Yang Haiming, Ren Wenbo, Jing Gaode, Jia Ruirui, Chen Bin, Zhu Guohua, Yu Kangyi, Que Yun, Wang Xiaofu, Liu Yiquan, Guo Yuanxin, Sun Ke, Luo Rongshu, Wang Guangdong, Sun Yuanyuan, Bing Yinkun, Tang Qiang, Si Jianing, Wang Shengjie, Li Liang, Li Jinyong, Haung Zhangwen, Kong Haixia, Wu Yanan, Wang Dong, Jiang Shenghui, Li Wenrui, Li Zhisheng, Li Ben, Zhang Jing, Zheng Fupeng, Wei Dingbang, Yu Qin, Qiu Jianhua, Wang Lingxiu, Yao Peng, Xu Zebo, Wang Jidong, Xu Yuzhen, Xie Ronghua, Zhang Yancong, Huang Jiao, Zhang Huiqin, Wang Fei, He Shengjia, Xu Zhenkun, Li Daqing, Wu Xiaohua, Xiao Ji, Yang Xukun, Xie Chaohua, Kong Weifeng, Che Haibao, Zhang Xinsheng, Xu Huanpeng, Cheng Songfeng, Luo Jugang, Cong Wei, Liu Jianyou, Jiang Zhen, Shen Shiguang, Zhang Junliang, Jia Fei, Cheng Yan, Zhang Sicai, Liu Yongqiang, Yao Yuanchao, Wang Liming, Zhuo Jianxing, Lin Jun, Liu Qinghui, Zhang Xiaochao, Liu Wentao, Deng Shoujun, Zhang Guanhua, Cao Haiqing, Li Chuan, Liu Guanghua, Yu Zian, Liu Deping, Zhao Fanghua, Hu Ningning, Hu Songtao, Wu Yongfeng, Wang Jinhui, Mao Haifeng, Xu Hao, Tao Jianfei, Liu Yuqiang, Huang Zunyun, Xue Junpeng, Zheng Guoqing, Wei Wencheng, Xie Haijian, Liu Hanchen, Li Bo, Zhang Ming, Qian Ming, Wang Yixiang, Lin Gaoshan, Li Guohui, Du Yong, and Wen Peiyan. The historical editions replaced by this Document are as follows. --- GB 750-1965 was first-time published in 1965; first-time revised in 1992; --- It is second-time revised hereby. Test Method for Autoclave Expansion of Cement Warning. This test is dangerous. The autoclave shall be used safely during the test. Pay attention to the direction of the exhaust port to avoid steam burns.1 ScopeThis Document gives the method and principle of cement autoclave stability test; and stipulates the instruments, equipment, materials, test conditions, specimen molding and maintenance, specimen length measurement, specimen autoclave and result calculation and evaluation. This Document is applicable to the determination of autoclave stability of hardened cement paste. Among them, the test method of 25 mm×25 mm×280 mm specimen is the reference method; and the test method of 25 mm×25 mm×146 mm specimen is the substitute method.2 Normative ReferencesThe provisions in following documents become the essential provisions of this Document through reference in this Document. For the dated documents, only the versions with the dates indicated are applicable to this Document; for the undated documents, only the latest version (including all the amendments) is applicable to this Document. GB/T 1346 Standard test method for water requirement for normal consistency, setting time, and soundness of the portland cement GB/T 6682 Water for analytical laboratory use - Specification and test methods GB/T 17671 Test method of cement mortar strength (ISO method)3 Terms and DefinitionsFor the purposes of this Document, the following terms and definitions apply.4 Method PrincipleUnder saturated water vapor conditions, the temperature and pressure are increased to hydrate most of the periclase and free calcium oxide in the cement in a short period of time.5 Instruments and Equipment5.1 Cement mortar mixer It shall meet the requirements of JC/T 681. 5.3 Nail head It shall meet the requirements of JC/T 603. 5.4 Tamping rod It shall meet the requirements of JC/T 603; the bottom surface of the square tamping rod shall be covered with a rubber layer. 5.5 Autoclave 5.6 Temperature measuring device The measuring range shall be no less than 250 ℃; and the graduation value shall be no greater than 1 ℃. 5.7 Curing box The temperature shall be maintained at 20 ℃ ±1 ℃; and the relative humidity shall be no less than 90%. 5.8 Comparator It shall meet the requirements of JC/T 603.Automatic measuring equipment that meets the requirements may also be used. When in use, the comparator shall be consistent with the laboratory temperature.6 Materials6.1 Cement sample The cement sample shall pass through a 0.9 mm square hole sieve and be mixed evenly. 6.3 Water for autoclaving Use Grade-3 water in accordance with GB/T 6682.7 Test Conditions7.1 Molding laboratory The temperature of the laboratory shall be maintained at 20 ℃ ± 2 ℃, and the relative humidity should be no less than 50%. 7.2 Autoclave laboratory It shall be equipped with ventilation equipment and tap water source, and shall not be shared with other tests.8 Molding and Curing of Specimens8.1 Preparation of test mold Before the test, apply a thin layer of engine oil to the inner cavity of the test mold; and install the nail head into the round holes at both ends of the mold cavity. The exposed part of the nail head shall not be stained with engine oil. 8.3 Molding of the test specimen Wearing rubber gloves, mix the prepared cement paste thoroughly and evenly; and then load it into the two cavities of the prepared test mold in two layers according to the following steps. 8.4 Curing and demolding Put the formed specimen together with the test mold in a moisture curing box for curing for 24 h±30 min and demolding; counting from the time when the cement is mixed with water.9 Measurement of Specimen Length9.1 Dial indicator calibration Before measuring, use the calibration rod to calibrate the base length reading of the comparator dial indicator. After the measurement is completed, measure the calibration rod reading again. If the change exceeds ±0.01 mm, recalibrate the dial indicator. ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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