Effect of Low Vacuum Environment on the Mechanical Properties of Hardened Cement Paste
CHANG Honglei1, WANG Xiaolong1, GUO Zhengkun1, FENG Pan2, LI Shaowei3, LIU Jian1,*
1 School of Qilu Transportation, Shandong University, Jinan 250002, China 2 School of Materials Science and Engineering, Southeast University, Nanjing 211189, China 3 Institute of Magnetic Levitation and Electromagnetic Propulsion, China Aerospace Science and Industry Corporation Limited, Beijing 100143, China
Abstract: To explore the mechanical properties of hardened cement paste under low vacuum, the mechanical properties of mature specimens (82 d and 128 d) exposed to low vacuum and indoor atmosphere were tested, the phase composition and pore structure were also investigated through X-ray diffraction (XRD) and Mercury intrusion porosimetry (MIP). The results show that short-term low vacuum exposure can improve the compressive strength of the mature specimens, but long-term low vacuum exposure is detrimental to the maintenance and development of specimen strength. Moreover, the low-vacuum environment basically does not change the phase type of hardened cement paste, and there is no obvious correlation between the C-S-H gel content and the strength. Besides, compared with the indoor atmospheric condition, the most probable pore size and total porosity of the mature specimens are obviously smaller after 28 days of low vacuum exposure, but larger after 168 days of low vacuum exposure, which has a good corresponding relationship with the strength development law.
作者简介: 常洪雷,博士毕业于东南大学,现为山东大学副教授,未来学者,博士研究生导师。主要从事高性能水泥基材料制备、自修复材料设计、混凝土耐久性及劣化机理、低真空环境材料性能研究。出版专著2部,发表学术论文50余篇,其中以第一作者或通信作者被土木工程材料领域顶级期刊Cement and Concrete Research、Cement and Concrete Composites等SCI收录20余篇,EI收录10余篇,授权专利7项。
引用本文:
常洪雷, 王晓龙, 郭政坤, 冯攀, 李少伟, 刘健. 低真空环境对硬化水泥浆体力学性能的影响[J]. 材料导报, 2024, 38(4): 22070290-6.
CHANG Honglei, WANG Xiaolong, GUO Zhengkun, FENG Pan, LI Shaowei, LIU Jian. Effect of Low Vacuum Environment on the Mechanical Properties of Hardened Cement Paste. Materials Reports, 2024, 38(4): 22070290-6.
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2024, Vol. 38 
