TY - JOUR
T1 - Microstructural and bulk property changes in hardened cement paste during the first drying process
AU - Maruyama, Ippei
AU - Nishioka, Yukiko
AU - Igarashi, Go
AU - Matsui, Kunio
N1 - Funding Information:
The work at Nagoya University was performed within the framework of the “Japan Ageing Management Program on System Safety” project sponsored by the Nuclear and Industrial Safety Agency (NISA) and the Nuclear Regulation Authority (NRA) . We thank NISA and NRA for their sponsorship.
Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2014/4
Y1 - 2014/4
N2 - This paper reports the microstructural changes and resultant bulk physical property changes in hardened cement paste (hcp) during the first desorption process. The microstructural changes and solid-phase changes were evaluated by water vapor sorption, nitrogen sorption, ultrasonic velocity, and 29Si and 27Al nuclear magnetic resonance. Strength, Young's modulus, and drying shrinkage were also examined. The first drying process increased the volume of macropores and decreased the volume of mesopores and interlayer spaces. Furthermore, in the first drying process globule clusters were interconnected. During the first desorption, the strength increased for samples cured at 100% to 90% RH, decreased for 90% to 40% RH, and increased again for 40% to 11% RH. This behavior is explained by both microstructural changes in hcp and C-S-H globule densification. The drying shrinkage strains during rapid drying and slow drying were compared and the effects of the microstructural changes and evaporation were separated.
AB - This paper reports the microstructural changes and resultant bulk physical property changes in hardened cement paste (hcp) during the first desorption process. The microstructural changes and solid-phase changes were evaluated by water vapor sorption, nitrogen sorption, ultrasonic velocity, and 29Si and 27Al nuclear magnetic resonance. Strength, Young's modulus, and drying shrinkage were also examined. The first drying process increased the volume of macropores and decreased the volume of mesopores and interlayer spaces. Furthermore, in the first drying process globule clusters were interconnected. During the first desorption, the strength increased for samples cured at 100% to 90% RH, decreased for 90% to 40% RH, and increased again for 40% to 11% RH. This behavior is explained by both microstructural changes in hcp and C-S-H globule densification. The drying shrinkage strains during rapid drying and slow drying were compared and the effects of the microstructural changes and evaporation were separated.
KW - Bending Strength (C)
KW - Calcium-Silicate-Hydrate (C-S-H)(B)
KW - Drying (A)
KW - Microstructure (B)
KW - Surface Area (B)
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U2 - 10.1016/j.cemconres.2014.01.007
DO - 10.1016/j.cemconres.2014.01.007
M3 - Article
AN - SCOPUS:84893404046
VL - 58
SP - 20
EP - 34
JO - Cement and Concrete Research
JF - Cement and Concrete Research
SN - 0008-8846
ER -