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Moisture Transfer Characteristics of Hardened Cement Pastes in Low Air Pressure
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Shenghao ZUO1, 2, Qiang YUAN1, 2, Tingjie HUANG1, 2, Kai ZHANG1, 2, Ruonan CHEN1, 2, Yanbin TAN3
Journal of the Chinese Ceramic Society | 2023, 51(5) : 1104 - 1114
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Journal of the Chinese Ceramic Society | 2023, 51(5): 1104-1114
• Research Articles •
Moisture Transfer Characteristics of Hardened Cement Pastes in Low Air Pressure
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Shenghao ZUO1, 2, Qiang YUAN1, 2, Tingjie HUANG1, 2, Kai ZHANG1, 2, Ruonan CHEN1, 2, Yanbin TAN3
Affiliations
  • 1.School of Civil Engineering, Central South University, Changsha 410075, China
  • 2.National Engineering Research Center of High-speed Railway Construction Technology, Changsha 410075, China
  • 3.Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China

    • ZUO Shenghao (1993-), male, Doctoral candidate. E-mail:

About Author:

ZUO Shenghao (1993-), male, Doctoral candidate. E-mail:

Published: 2023-05-20 doi: 10.14062/j.issn.0454-5648.20220816
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The isothermal exposure tests for 270 d at different air pressure (i.e., 101 kPa, 60 kPa, and 20 kPa) and relative humidities (i.e., 43%, and 98%) were carried out for hardened cement pastes. Effect of air pressure on the moisture content and the chemically bound water content in hardened cement pastes was investigated. The moisture transfer characteristics at different low air pressures were analyzed by a proposed numerical model. The results show that a low air pressure promotes the water loss within the hardened cement pastes during the isothermal drying process, resulting in a slight decrease in the chemically bound water content. Under the isothermal wetting condition, the mass of hardened cement paste grows at a logarithmic rule due to the moisture diffusion into the pore network, the decrease of air pressure significantly improve the early-stage mass growth rate and the final mass gain. The numerical approach on the moisture transfer indicates that the increases of water vapor diffusion coefficient, mass transfer coefficient, and intrinsic permeability of hardened cement paste are the main causes of moisture transfer behavior during the isothermal drying and wetting processes.

low air pressure  /  moisture transfer  /  isothermal drying  /  isothermal wetting  /  chemically bound water
左胜浩, 元强, 黄庭杰, 张凯, 陈若楠, 谭盐宾. 低气压环境下硬化水泥浆体的水分传输特性. 硅酸盐学报, 2023 , 51 (5) : 1104 -1114 . DOI: 10.14062/j.issn.0454-5648.20220816
Shenghao ZUO, Qiang YUAN, Tingjie HUANG, Kai ZHANG, Ruonan CHEN, Yanbin TAN. Moisture Transfer Characteristics of Hardened Cement Pastes in Low Air Pressure[J]. Journal of the Chinese Ceramic Society, 2023 , 51 (5) : 1104 -1114 . DOI: 10.14062/j.issn.0454-5648.20220816
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Year 2023 volume 51 Issue 5
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Article Info
doi: 10.14062/j.issn.0454-5648.20220816
  • Receive Date：2022-09-30
  • Online Date：2026-10-20
  • Published：2023-05-20
Article Data
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History
  • Received：2022-09-30
  • Revised：2022-10-06
Funding
Affiliations
    1.School of Civil Engineering, Central South University, Changsha 410075, China
    2.National Engineering Research Center of High-speed Railway Construction Technology, Changsha 410075, China
    3.Railway Engineering Research Institute, China Academy of Railway Sciences Corporation Limited, Beijing 100081, China

Corresponding:

YUAN Qiang (1981-), male, Ph.D., Professor. E-mail:
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表12种不同金属材料的力学参数
科
Family		 属数
Number of
genus		 种数
Number of
species		 占总种数比例
Percentage of
total species (%)		 属
Genus		 种数
Number of
species		 占总种数比例
Percentage of total
species (%)
鹅膏菌科Amanitaceae 2 11 5.26 鹅膏菌属 Amanita 10 4.78
小菇科 Mycenaceae 2 12 5.74 丝盖伞属 Inocybe 5 2.39
多孔菌科 Polyporaceae 8 14 6.70 蜡蘑属 Laccaria 5 2.39
红菇科 Russulaceae 3 23 11.00 小皮伞属 Marasmius 6 2.87
小菇属 Mycena 11 5.26
光柄菇属 Pluteus 5 2.39
红菇属 Russula 17 8.13
栓菌属 Trametes 5 2.39
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