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Title	Internal Relative Humidity Distribution in High-Performance Cement Paste Due to Moisture Diffusion and Self-Desiccation
Accession No	01020768
Authors	Jiang, Zhengwu ; Sun, Zhenping ; Wang, Peiming
Journal Title	Cement and Concrete Research Vol. 36 No. 2
Corp. Authors / Publisher	Elsevier
Publication Date	20060200
Description	pp 320-325; Figures(6); References(14); Tables(2)
Media Type	Print
Languages	English
Abstract	This investigation was carried out to study internal relative humidity (IRH) distribution of cement paste made with different water / cement ratios (w / c) and mineral admixtures in isothermal drying conditions. IRH changes in cement paste resulting from self-desiccation and moisture diffusion, respectively, at different ages were studied. The change laws of IRH in cement paste resulting from combining moisture diffusion with self-desiccation were discussed. The results indicate that IRH reduction of cement paste with w / c higher than 0.4 is mainly affected by moisture diffusion. However, IRH reduction of cement paste with w / c no higher than 0.4 is controlled by both moisture diffusion and self-desiccation. With the decrease of w / c, IRH reduction of cement paste resulting from self-desiccation increases, and IRH reduction resulting from moisture diffusion decreases at a given age. IRH decrement of cement paste incorporated with silica fume and ground blast-furnace slag is higher than that of control paste. w / c and the distance to the exposed surface play a significant role in IRH change resulting from moisture diffusion in isothermal drying condition. Change laws of IRH in cement paste with silica fume due to moisture diffusion considering self-desiccation are different from those in cement paste without silica fume.
Supplemental Information	Abstract reprinted with permission from Elseiver.
TRT Terms	Admixtures ; Cement paste ; Desiccation ; Drying rate ; Humidity ; Silica fume ; Slag ; Water cement ratio ; Wetting and drying tests
Other Terms	Moisture diffusion
Subject Areas	H32 CEMENT AND CONCRETE; I32 Concrete
Availability	Find a library where document is available Order Document: http://worldcat.org/issn/00088846
TRIS Files	HRIS
Database	TRIS Online

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