低气压成型的非引气水泥基材料水化与孔结构

doi:10.11896/cldb.20100140

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Abstract This work investigates the differences in hydration and pore structure between cement-based materials prepared (i.e., mixed and set) under low and standard air pressures. The study is divided into two parts, namely, a simulation test and a field investigation. In the simulation study, hydration products, hydration degree and pore structures of cement pastes and air-void characteristics of mortars prepared under different simulated air pressures were analyzed. In the field study, the densities of cement pastes and densities, strengths and air-void characteristics of mortars prepared in regions under different air pressures were tested. The results show that hydration products, hydration process and pore structure of cement pastes prepared under various air pressures are essentially unchanged. Compared to the average radius and spacing factor of air-voids in the mortar prepared under standard air pressure, those of air-voids in the mortar prepared under low air pressure are respectively 3.1% and 8.1% lower; however, the difference in compressive strength is less than 0.5%. In general, low air pressure during mixing and setting stages do not negatively affect the properties of cement-based materials. Therefore, the properties of concrete to be used in construction projects in high-elevation locations can reliably be established by testing specimens prepared at low elevations.

Key words： cement-based materials concrete mortar cement paste hydration pore structure low air pressure

Published: 25 June 2022 Online: 2022-06-24

CLC number:

TU528

Fund:International S & T Cooperation Program of China (ISTCP 2014DFR81000) and S & T Program of Transport Bureau of Tibet Autonomous Region (XZJTKJ〔2020〕04).

About author: Mr. Xin Chen is a Ph.D. candidate in the School of Transportation Science and Engineering, Harbin Institute of Technology. He got his master degree in the University of Bath (UK) and ever worked at State Key Laboratory of Safety and Health for In-Service Long Span Bridges, JSTI Group. His main research interests are properties of cement-based materials. He has ever participated in 3 research projects which were financially supported by the government and published 11 papers for them, including 2 SCI papers and 3 EI papers.
Dr. Yong Ge is a professor and Ph.D. supervisor in the School of Transportation Science and Engineering, Harbin Institute of Technology. He has engaged in the research of cement-based materials for decades. He has chaired more than 20 research projects supported by national and provincial governments and received several great awards due to his outstanding contributions. He has published more than 80 papers, two-thirds of which were in SCI or EI journals.
Dr. Bo Tian is a scientist in Research Institute of Highway, Ministry of Transport and Supervising Ph.D. candidates in both Harbin Institute of Technology and Tongji University. He has been selected in the Hundred-Thousand-Ten Thousand Project and won an honorary title as Young & Middle-Aged Expert with outstanding contributions. He has been elected as an expert committee member of the Ministry of Transport. He has engaged in the research of cement concrete pavement and cement concrete materials for many years. He has chaired / participated in more than 50 government funded research projects and more than 10 standard edition works. Publications of He include 4 books and more than 100 research articles. He has won a Second Prize of the National Science and Technology Award (ranked first) and 7 First Prizes of provincial or ministry level awards. He has also won many honorary titles, such as Young Talent in Transport (2012) by the Ministry of Transport and Leading Talent in Transport Industry (2017).

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Cite this article:

CHEN Xin,LIU Xu,LI Lihui, et al. Hydration and Pore Structure of Non-air-entrained Cement-based Materials Prepared Under Low Air Pressure[J]. Materials Reports, 2022, 36(12): 20100140-9.

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http://www.mater-rep.com/EN/10.11896/cldb.20100140 OR http://www.mater-rep.com/EN/Y2022/V36/I12/20100140

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