Microstructural and bulk property changes in hardened cement paste during the first drying process |
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| Affiliation: | 1. Graduate School of Environmental Studies, Nagoya University, ES Building, No. 546, Furo-cho, Chikusa-ku, Nagoya 464–8603, Japan;2. Graduate School of Environmental Studies, Nagoya University, ES Building, No. 539, Furo-cho, Chikusa-ku, Nagoya 464–8603, Japan;3. Products & Marketing Development Dept. Asahi-KASEI Construction Materials Corporation, 106 Someya, Sakai-machi, Sashima-gun, Ibaraki, 306–0493, Japan;1. Magnel Laboratory for Concrete Research, Department of Structural Engineering, Faculty of Engineering, Ghent University, Technologiepark Zwijnaarde 904, B-9052 Ghent, Belgium;2. Polymer Chemistry and Biomaterials Group, Department of Organic Chemistry, Faculty of Sciences, Ghent University, Krijgslaan 281, B-9000 Ghent, Belgium;3. Department of Chemistry, Royal Military Academy, Renaissancelaan 30, B-1000 Brussels, Belgium;1. Graduate School of Environmental Studies, Nagoya University, ES Building, No. 546, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan;2. Analysis & Simulation Center, Asahi Kasei Corporation, 2-1 Samejima, Fuji-city, Shizuoka 416-8501, Japan;3. R&D Laboratories, Asahi Kasei Homes Corporation, 2-1 Samejima, Fuji-city, Shizuoka 416-8501, Japan;4. Graduate School of Engineering, Tohoku University, Aramaki Aoba 6-6-11-1205, Aoba-ku, Sendai, Miyagi 980-8579, Japan;1. HeidelbergCement Technology Center, Oberklamweg 6, 69181 Leimen, Germany;2. Micro and NanoMaterials and Technologies Industrial Doctorate Centre, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom;3. Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH, United Kingdom |
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| Abstract: | 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. |
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