长期低温环境对氯氧镁水泥微观结构及力学性能的影响

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (12): 4208-4215.

长期低温环境对氯氧镁水泥微观结构及力学性能的影响

常成功^1,2,3, 安凌云⁴, 董金美^2,3, 郑卫新^2,3, 文静^2,3, 阎峰云¹, 肖学英^2,3

1.兰州理工大学,省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050;
2.中国科学院青海盐湖研究所,中国科学院盐湖资源综合高效利用重点实验室,西宁 810008;
3.青海省盐湖资源化学重点实验室, 西宁 810008;
4.青海民族大学,物理与电子信息工程学院,青海省纳米材料与技术重点实验室,西宁 810007

收稿日期:2023-06-14 修订日期:2023-07-20 出版日期:2023-12-15 发布日期:2023-12-12
通信作者: 阎峰云,教授。E-mail:yanfy@lut.cn;肖学英,研究员。E-mail:xiaoxy@isl.ac.cn
作者简介:常成功(1981—),男,博士研究生,高级工程师。主要从事镁质材料方面的研究。E-mail:ccg168@isl.ac.cn
基金资助:
青海省应用基础研究(2021-ZJ-737);青海省“昆仑英才·高端创新创业人才”拔尖人才;青海民族大学研究生精品示范课程(JK-2022-09)

Effect of Long-Term Low Temperature Environment on Microstructure and Mechanical Properties of Magnesium Oxychloride Cement

CHANG Chenggong^1,2,3, AN Lingyun⁴, DONG Jinmei^2,3, ZHENG Weixin^2,3, WEN Jing^2,3, YAN Fengyun¹, XIAO Xueying^2,3

1. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China;
2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences, Xining 810008, China;
3. Key Laboratory of Salt Lake Resources Chemistry of Qinghai Province, Xining 810008, China;
4. Qinghai Provincial Key Laboratory of Nanomaterials and Technology, School of Physics and Electronic Information Engineering, Qinghai Minzu University, Xining 810007, China

Received:2023-06-14 Revised:2023-07-20 Online:2023-12-15 Published:2023-12-12

摘要/Abstract

摘要： 为揭示氯氧镁水泥(MOC)在长期低温环境下的耐久性能,采用SEM、MIP、XRD、TG-DSC、FT-IR以及微机电液伺服压力试验机考察了冷冻时间对MOC试样微观结构、物相组成以及力学性能的影响。结果表明:MOC试样具有良好的长期低温抗冻性能,经过12个月的冷冻处理后,MOC试样的质量仅增加了0.9%;微观形貌由较细的针棒状与凝胶状转变为较粗的针棒状与凝胶块状,微孔孔径为38~48 nm,0.01~0.1 μm的微孔体积比例为70%~80%;相组成无明显变化,主要强度相5Mg(OH)₂·MgCl₂·8H₂O(5·1·8相)含量仅减少了3%;力学性能仅略有降低,其中抗压和抗折强度分别降低了3.4和2.6 MPa。

关键词: 氯氧镁水泥, 长期低温环境, 微观结构, 力学性能, 抗冻性能

Abstract: In order to reveal the durability of magnesium oxychloride cement (MOC) under long-term low temperature environment, the effect of freezing time on microstructure, phase composition and mechanical properties of MOC samples were investigated by SEM, MIP, XRD, TG-DSC, FT-IR and microcomputer electro-hydraulic servo pressure testing machine. The results show that MOC samples have good long-term low temperature frost resistance. After 12 months of long-term low temperature freezing experiment, the weight of MOC samples only increases by 0.9%. The microscopic morphology changes from fine needle-like and gel-like to thicker needle-like and gel-like block. The microporous structure does not change significantly, with the average pore diameter varying between 38 and 48 nm and the pore volume distribution (0.01 μm to 0.1 μm) fluctuating from 70% to 80%. The phase composition does not change significantly, and the content of the main strength phase 5Mg(OH)₂·MgCl₂·8H₂O (5·1·8 phase) only decreases by 3%. The mechanical properties decrease slightly, in which the compressive strength decreases by 3.4 MPa and the flexural strength decreases by only 2.6 MPa.

Key words: magnesium oxychloride cement, long-term low temperature environment, microstructure, mechanical property, frost resistance

中图分类号:

TQ172

常成功, 安凌云, 董金美, 郑卫新, 文静, 阎峰云, 肖学英. 长期低温环境对氯氧镁水泥微观结构及力学性能的影响[J]. 硅酸盐通报, 2023, 42(12): 4208-4215.

CHANG Chenggong, AN Lingyun, DONG Jinmei, ZHENG Weixin, WEN Jing, YAN Fengyun, XIAO Xueying. Effect of Long-Term Low Temperature Environment on Microstructure and Mechanical Properties of Magnesium Oxychloride Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4208-4215.

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